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    I mentioned this on another thread but any bugs you find with
    playing videos that can be resolved by disabling
    media.mediasource.enabled is a Media Source Extensions bug. You
    should file a bug in Core :: Video/Audio and mark it as blocking bug
    <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=778617"><b>778617</b></a>.<br>
    <br>
    <a class="moz-txt-link-freetext"
href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=Video%2FAudio">https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=Video%2FAudio</a><br>
    <br>
    <div class="moz-cite-prefix">On 2014-10-30 8:30 PM, Vincent Zhao
      wrote:<br>
    </div>
    <blockquote
cite="mid:CA+-X=by-XpRt5VBDnCkFzuaziOCEvo2ijPVt2_cy1jG-oMVkrQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">Too bad disabling media.mediasource.enabled removes
        the option to play YouTube videos at 60 FPS.<br>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Thu, Oct 30, 2014 at 5:56 PM,
          Vincent Zhao <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:gyroknight98@gmail.com" target="_blank">gyroknight98@gmail.com</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div dir="ltr">I can confirm that setting
              media.mediasource.enabled to false in <a class="moz-txt-link-freetext" href="about:config">about:config</a> does
              work to solve the issue, just remember to restart Nightly
              after changing the value.<br>
            </div>
            <div class="HOEnZb">
              <div class="h5">
                <div class="gmail_extra"><br>
                  <div class="gmail_quote">On Thu, Oct 30, 2014 at 10:19
                    AM, Dāvis Mosāns <span dir="ltr"><<a
                        moz-do-not-send="true"
                        href="mailto:davispuh@gmail.com" target="_blank">davispuh@gmail.com</a>></span>
                    wrote:<br>
                    <blockquote class="gmail_quote" style="margin:0 0 0
                      .8ex;border-left:1px #ccc solid;padding-left:1ex">
                      <div dir="ltr">forgot to tell, YouTube HTML5
                        player says it's using DASH player with WebM VP9
                        codec
                        <div>
                          <div><br>
                            <div>
                              <div class="gmail_extra"><br>
                                <div class="gmail_quote">2014-10-30
                                  16:17 GMT+02:00 Dāvis Mosāns <span
                                    dir="ltr"><<a
                                      moz-do-not-send="true"
                                      href="mailto:davispuh@gmail.com"
                                      target="_blank">davispuh@gmail.com</a>></span>:<br>
                                  <blockquote class="gmail_quote"
                                    style="margin:0 0 0
                                    .8ex;border-left:1px #ccc
                                    solid;padding-left:1ex">
                                    <div dir="ltr">
                                      <div>
                                        <div>I've encountered this same
                                          issue in last days, don't
                                          really remember when was first
                                          time I saw it. Also it's not
                                          only sound, sometimes
                                          video/image stops while sound
                                          is still playing. And
                                          sometimes can't pause or
                                          resume that stuck video. It
                                          seems to be somewhat random,
                                          for example it didn't happen
                                          on first video, but on 2nd one
                                          at exactly 4:12 sound stopped
                                          and even clicking pause it
                                          didn't actually paused while
                                          it was marked as paused and
                                          couldn't resume.<br>
                                          <br>
                                        </div>
                                        This is on Windows 8 x64, with
                                        Radeon HD5850, Catalyst 14.4<br>
                                        <br>
                                      </div>
                                      Probably should submit issue to
                                      bugzilla if there aren't any
                                      regarding this.
                                      <div>
                                        <div><br>
                                          <div>
                                            <div>
                                              <div>
                                                <div class="gmail_extra"><br>
                                                  <br>
                                                  <div
                                                    class="gmail_quote">2014-10-30
                                                    9:15 GMT+02:00
                                                    Vincent Zhao <span
                                                      dir="ltr"><<a
                                                        moz-do-not-send="true"
href="mailto:gyroknight98@gmail.com" target="_blank">gyroknight98@gmail.com</a>></span>:<br>
                                                    <blockquote
                                                      class="gmail_quote"
                                                      style="margin:0px
                                                      0px 0px
                                                      0.8ex;border-left:1px
                                                      solid
                                                      rgb(204,204,204);padding-left:1ex">
                                                      <div dir="ltr">It's
                                                        a Radeon HD 6850
                                                        with the latest
                                                        version of
                                                        Catalyst,<br>
                                                      </div>
                                                      <div>
                                                        <div>
                                                          <div
                                                          class="gmail_extra"><br>
                                                          <div
                                                          class="gmail_quote">On
                                                          Thu, Oct 30,
                                                          2014 at 2:18
                                                          AM, Basil
                                                          Chupin <span
                                                          dir="ltr"><<a
moz-do-not-send="true" href="mailto:blchupin@iinet.net.au"
                                                          target="_blank">blchupin@iinet.net.au</a>></span>
                                                          wrote:<br>
                                                          <blockquote
                                                          class="gmail_quote"
                                                          style="margin:0px
                                                          0px 0px
                                                          0.8ex;border-left:1px
                                                          solid
                                                          rgb(204,204,204);padding-left:1ex"><span>On
                                                          30/10/14
                                                          16:43, Vincent
                                                          Zhao wrote:<br>
                                                          </span>
                                                          <blockquote
                                                          class="gmail_quote"
                                                          style="margin:0px
                                                          0px 0px
                                                          0.8ex;border-left:1px
                                                          solid
                                                          rgb(204,204,204);padding-left:1ex"><span>
                                                          I mentioned my
                                                          system at the
                                                          end: "I've
                                                          only tested
                                                          this on
                                                          Windows 7
                                                          x64", if
                                                          that's what
                                                          you meant. As
                                                          for my mail
                                                          client, I'm
                                                          not sure why
                                                          that's
                                                          relevant, but
                                                          I'm currently
                                                          just using the
                                                          web interface
                                                          of Gmail in
                                                          Nightly. If
                                                          you mean
                                                          system specs,
                                                          I'm running it
                                                          off the
                                                          onboard
                                                          Realtek ALC
                                                          888b chipset
                                                          of my
                                                          GA-Z68XP-UD3.
                                                          I'm not sure
                                                          how you're
                                                          using VLC to
                                                          play YouTube
                                                          videos as I
                                                          thought VLC
                                                          was only for
                                                          standalone
                                                          media files.<br>
                                                          <br>
                                                          </span>
                                                          <div>
                                                          <div>
                                                          On Thu, Oct
                                                          30, 2014 at
                                                          1:37 AM, Basil
                                                          Chupin <<a
moz-do-not-send="true" href="mailto:blchupin@iinet.net.au"
                                                          target="_blank">blchupin@iinet.net.au</a>
                                                          <mailto:<a
moz-do-not-send="true" href="mailto:blchupin@iinet.net.au"
                                                          target="_blank">blchupin@iinet.net.au</a>>>
                                                          wrote:<br>
                                                          <br>
                                                              On
                                                          30/10/14
                                                          15:05, Vincent
                                                          Zhao wrote:<br>
                                                          <br>
                                                                  I've
                                                          been having
                                                          issues with
                                                          with the HTML5
                                                          player on
                                                          YouTube<br>
                                                                  on the
                                                          past few days'
                                                          worth of
                                                          Nightlies. I'm
                                                          currently on
                                                          the<br>
                                                                  latest
                                                          Nightly as of
                                                          10/29/2014,
                                                          however, I've
                                                          been having<br>
                                                                  issues
                                                          with YouTube
                                                          where videos
                                                          will play fine
                                                          for a few<br>
                                                                 
                                                          minutes before
                                                          the audio cuts
                                                          out at
                                                          completely
                                                          sporadic<br>
                                                                 
                                                          moments on
                                                          completely
                                                          random videos.
                                                          Where the
                                                          audio cuts out<br>
                                                                  is
                                                          usually
                                                          consistent
                                                          though as long
                                                          as the video
                                                          starts at<br>
                                                                  the
                                                          same place
                                                          every time.
                                                          Strangely, the
                                                          HTML5 player
                                                          breaks<br>
                                                                  around
                                                          the same time,
                                                          with the video
                                                          continuing to
                                                          play<br>
                                                                 
                                                          without audio,
                                                          and for some
                                                          reason, if I
                                                          pause and
                                                          unpause the<br>
                                                                  video.
                                                          I can't pause
                                                          the video
                                                          afterwards.
                                                          The play
                                                          button is<br>
                                                                 
                                                          permanently
                                                          stuck thinking
                                                          the video is
                                                          paused,
                                                          meaning it<br>
                                                                  shows
                                                          the play
                                                          triangle
                                                          instead of the
                                                          pause bars it
                                                          should<br>
                                                                  while
                                                          playing, and
                                                          the seeker at
                                                          the bottom
                                                          keeps going.<br>
                                                                 
                                                          Clicking on
                                                          the player
                                                          shows the
                                                          animation for
                                                          pausing, but<br>
                                                                  the
                                                          neither the
                                                          video nor the
                                                          seeker pause.
                                                          Sometimes
                                                          clicking<br>
                                                                  on an
                                                          earlier part
                                                          of the video
                                                          will restore
                                                          audio, other<br>
                                                                  times,
                                                          it will go to
                                                          the proper
                                                          segment of
                                                          video, but
                                                          still no<br>
                                                                  audio,
                                                          and sometimes
                                                          it will
                                                          restore audio,
                                                          but will<br>
                                                                 
                                                          constantly
                                                          play back to
                                                          the spot the
                                                          audio stopped
                                                          as if you<br>
                                                                  never
                                                          rewinded in
                                                          the first
                                                          place. Other
                                                          videos, in
                                                          particular<br>
                                                                  longer
                                                          videos (the
                                                          one I had an
                                                          issue with was
                                                          30 minutes<br>
                                                                  long),
                                                          downright
                                                          don't stream
                                                          properly with
                                                          the video
                                                          always<br>
                                                                 
                                                          buffering,
                                                          perhaps
                                                          playing for a
                                                          couple of
                                                          seconds before<br>
                                                                 
                                                          buffering
                                                          again forever,
                                                          but only if
                                                          I'm signed
                                                          into YouTube<br>
                                                                  and
                                                          the video
                                                          attempts to
                                                          resume from
                                                          where it last
                                                          left off.<br>
                                                                  If I
                                                          sign out and
                                                          the video just
                                                          plays from the
                                                          beginning, it<br>
                                                                  works
                                                          fine. It's not
                                                          a network
                                                          issue as not
                                                          only do I not<br>
                                                                 
                                                          encounter the
                                                          buffering
                                                          issue on
                                                          stable Firefox
                                                          and other<br>
                                                                 
                                                          browsers, but
                                                          the HTML5
                                                          player shows
                                                          that the video
                                                          is fully<br>
                                                                 
                                                          buffered on
                                                          the seeker.<br>
                                                          <br>
                                                                  Sorry
                                                          for the
                                                          extremely long
                                                          message, but I
                                                          wanted to be
                                                          as<br>
                                                                 
                                                          specific as
                                                          possible on
                                                          what issues
                                                          I've
                                                          encountered.
                                                          I've<br>
                                                                  tried
                                                          clearing the
                                                          cache,
                                                          deleting
                                                          YouTube's
                                                          cookies, using
                                                          a<br>
                                                                 
                                                          different
                                                          profile,
                                                          creating a
                                                          clean profile,
                                                          resetting<br>
                                                                 
                                                          Nightly,
                                                          enabling/disabling
                                                          e10s, and Safe
                                                          Mode. All
                                                          plugins<br>
                                                                  and
                                                          addons are
                                                          fully updated
                                                          or disabled.
                                                          I've only
                                                          tested<br>
                                                                  this
                                                          on Windows 7
                                                          x64.<br>
                                                          <br>
                                                                  <a
                                                          moz-do-not-send="true"
href="https://www.youtube.com/watch?v=BN-oCcDPW3E&list=PLknALywhzhhgwmo095D2ZH2LS_5Lfw1le&index=19"
target="_blank">https://www.youtube.com/watch?v=BN-oCcDPW3E&list=PLknALywhzhhgwmo095D2ZH2LS_5Lfw1le&index=19</a><br>
                                                                  -
                                                          audio cuts out
                                                          ~1:52<br>
                                                          <br>
                                                                  <a
                                                          moz-do-not-send="true"
href="https://www.youtube.com/watch?v=xweRl4LZlmo&index=18&list=PLknALywhzhhgwmo095D2ZH2LS_5Lfw1le"
target="_blank">https://www.youtube.com/watch?v=xweRl4LZlmo&index=18&list=PLknALywhzhhgwmo095D2ZH2LS_5Lfw1le</a><br>
                                                                  -
                                                          audio cuts out
                                                          ~4:12<br>
                                                          <br>
                                                                  <a
                                                          moz-do-not-send="true"
href="https://www.youtube.com/watch?v=Y3R8tkvlAlk&index=11&list=PLknALywhzhhgwmo095D2ZH2LS_5Lfw1le"
target="_blank">https://www.youtube.com/watch?v=Y3R8tkvlAlk&index=11&list=PLknALywhzhhgwmo095D2ZH2LS_5Lfw1le</a><br>
                                                                  -
                                                          refuses to
                                                          buffer when
                                                          trying to
                                                          resume from
                                                          last place<br>
                                                          <br>
                                                          <br>
                                                              Which
                                                          system? You're
                                                          Header to post
                                                          doesn't show
                                                          the Mail
                                                          Client<br>
                                                              you are
                                                          using.<br>
                                                          <br>
                                                              The above
                                                          play fine, no
                                                          hassles -  but
                                                          I am using a
                                                          Linux distro<br>
                                                             
                                                          (openSUSE). I
                                                          am also using
                                                          VLC as my
                                                          video/sound
                                                          player and
                                                          using<br>
                                                              a Creative
                                                          sound card.<br>
                                                          <br>
                                                              However,
                                                          there is one
                                                          thing which I
                                                          *hate* - most
                                                          vehemently :-)<br>
                                                              (Tm) - and
                                                          it's not a
                                                          joke: one
                                                          needs to exit
                                                          YouTube after<br>
                                                              viewing a
                                                          file in order
                                                          to view
                                                          another file,
                                                          which is damn<br>
                                                              annoying.
                                                          If one views a
                                                          file and then
                                                          tries to
                                                          follow it up
                                                          with<br>
                                                              another,
                                                          the second
                                                          file comes up
                                                          with "An error
                                                          has<br>
                                                             
                                                          occurred......"
                                                          and the second
                                                          file will not
                                                          play. Exiting<br>
                                                              YouTube,
                                                          coming back
                                                          and selecting
                                                          the second
                                                          file will then
                                                          make<br>
                                                              the second
                                                          file play
                                                          without a
                                                          problem.<br>
                                                          <br>
                                                          </div>
                                                          </div>
                                                          </blockquote>
                                                          <br>
                                                          <span>
                                                          <br>
                                                          I mentioned my
                                                          system at the
                                                          end: "I've
                                                          only tested
                                                          this on
                                                          Windows 7
                                                          x64", if
                                                          that's what
                                                          you meant. As
                                                          for my mail
                                                          client, I'm
                                                          not sure why
                                                          that's
                                                          relevant, but
                                                          I'm currently
                                                          just using the
                                                          web interface
                                                          of Gmail in
                                                          Nightly. If
                                                          you mean
                                                          system specs,
                                                          I'm running it
                                                          off the
                                                          onboard
                                                          Realtek ALC
                                                          888b chipset
                                                          of my
                                                          GA-Z68XP-UD3.
                                                          I'm not sure
                                                          how you're
                                                          using VLC to
                                                          play YouTube
                                                          videos as I
                                                          thought VLC
                                                          was only for
                                                          standalone
                                                          media files.<br>
                                                          <br>
                                                          <br>
                                                          </span>
                                                          Ooops, sorry,
                                                          I didn't read
                                                          the very last 
                                                          sentence in
                                                          the last
                                                          paragraph :-(
                                                          . Mention of
                                                          the client is
                                                          because one
                                                          can get the
                                                          idea of the
                                                          system a
                                                          person is
                                                          using and
                                                          follows on
                                                          from my
                                                          previous
                                                          sentence (in
                                                          my first
                                                          response).<br>
                                                          <br>
                                                          I mentioned
                                                          the video card
                                                          I am using
                                                          because
                                                          whether it is
                                                          an onboard
                                                          card or an
                                                          external one
                                                          each requires
                                                          a driver and
                                                          many problems
                                                          may be caused
                                                          by not having
                                                          up-to-date
                                                          drivers for
                                                          the video card
                                                          or chip.<br>
                                                          <br>
                                                          Re VLC:
                                                          shouldn't have
                                                          mentioned it
                                                          in this
                                                          context. I use
                                                          it to view all
                                                          videos
                                                          downloaded
                                                          from YouTube
                                                          but Firefox,
                                                          of course,
                                                          uses the
                                                          OpenH264 Video
                                                          Codec to
                                                          display
                                                          YouTube
                                                          videos.
                                                          <div>
                                                          <div><br>
                                                          <br>
                                                          BC<br>
                                                          <br>
                                                          -- <br>
                                                          Privatise
                                                          profits,
                                                          nationalise
                                                          losses.<br>
                                                          <br>
_______________________________________________<br>
                                                          Nightly-testers
                                                          mailing list<br>
                                                          <a
                                                          moz-do-not-send="true"
href="mailto:Nightly-testers@mozilla.org" target="_blank">Nightly-testers@mozilla.org</a><br>
                                                          <a
                                                          moz-do-not-send="true"
href="https://mail.mozilla.org/listinfo/nightly-testers" target="_blank">https://mail.mozilla.org/listinfo/nightly-testers</a><br>
                                                          </div>
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                                                          </blockquote>
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                                                          <br>
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                                                        </div>
                                                      </div>
                                                      <br>
_______________________________________________<br>
                                                      Nightly-testers
                                                      mailing list<br>
                                                      <a
                                                        moz-do-not-send="true"
href="mailto:Nightly-testers@mozilla.org" target="_blank">Nightly-testers@mozilla.org</a><br>
                                                      <a
                                                        moz-do-not-send="true"
href="https://mail.mozilla.org/listinfo/nightly-testers" target="_blank">https://mail.mozilla.org/listinfo/nightly-testers</a><br>
                                                      <br>
                                                    </blockquote>
                                                  </div>
                                                  <br>
                                                </div>
                                              </div>
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                                          </div>
                                        </div>
                                      </div>
                                    </div>
                                  </blockquote>
                                </div>
                                <br>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                    </blockquote>
                  </div>
                  <br>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
        <br>
      </div>
      <br>
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      <br>
      <pre wrap="">_______________________________________________
Nightly-testers mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Nightly-testers@mozilla.org">Nightly-testers@mozilla.org</a>
<a class="moz-txt-link-freetext" href="https://mail.mozilla.org/listinfo/nightly-testers">https://mail.mozilla.org/listinfo/nightly-testers</a>
</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Anthony Hughes
Senior Quality Engineer
Mozilla Corporation</pre>
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