Launchpad has imported 18 comments from the remote bug at https://bugzilla.mozilla.org/show_bug.cgi?id=1427267.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2017-12-28T13:31:48+00:00 S-bugzilla-mozilla wrote: Steps to reproduce: 0. (fresh profile) 1. Navigate to any page with a <video> element on it - Preferably with human speech, since it's much more noticeable that way - Suggested links: https://vimeo.com/64654583, https://www.youtube.com/watch?v=JWD1Fpdd4Pc, https://www.youtube.com/watch?v=OyfBQmvr2Hc 2. Open the JS Console 3. Run `document.querySelector('video').playbackRate = 3.5` (any number > 2 works, but higher speeds are much more noticeable) 4. Listen to the audio (there's nothing wrong with the video) Expected results: Smooth audio playback with no audible stuttering, skipping, or artifacts Observed results: Audio with skipping and stuttering, especially noticeable when there's human speech Notes: - Playback works just fine on WebKit and its derivatives (Opera, Chrome, Safari, Electron-based apps) - Playback is also just fine on VLC - Reproduced on: my 2014 MacBook Pro, a 2013 Mac Mini, and a 1st-gen MacBook, all running macOS High Sierra 10.13.2 Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/2 ------------------------------------------------------------------------ On 2018-01-03T09:15:41+00:00 Suro001 wrote: I can't repro the issue. I suspect you network connection is not fast enough so playback can consume data without underflow. Can you try to download the file and play it on the local storage? Thanks! Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/3 ------------------------------------------------------------------------ On 2018-01-09T07:17:01+00:00 S-bugzilla-mozilla wrote: Playing a video from the local filesystem has the same effect. Networking is not the issue since video playback works perfectly fine in WebKit-based browsers. For example, compare the playback of https://www.youtube.com/watch?v=K0Tsa3smr1w on Firefox at 3.5 speed v the same on Safari: audio on Safari is much smoother than FF, especially since FF skips audio every few seconds. Human speech is practically undescipherable on FF, but is smooth on Safari. Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/4 ------------------------------------------------------------------------ On 2018-01-10T03:59:04+00:00 Suro001 wrote: Can you launch firefox from the console by doing: MOZ_LOG=MediaDecoder:4,AudioStream:3 path/to/your/firefox "https://www.youtube.com/watch?v=K0Tsa3smr1w"; and submit the logs? Thanks! Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/5 ------------------------------------------------------------------------ On 2018-01-10T09:33:28+00:00 S-bugzilla-mozilla wrote: Created attachment 8941359 fflog.log Log from `MOZ_LOG=MediaDecoder:4,AudioStream:3 /Applications/Firefox.app/Contents/MacOS/firefox "https://www.youtube.com/watch?v=K0Tsa3smr1w"` Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/6 ------------------------------------------------------------------------ On 2018-02-20T18:56:39+00:00 Giles-d wrote: Bryce, do you have any interest in the playback rate stuff? Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/7 ------------------------------------------------------------------------ On 2018-02-23T16:33:32+00:00 Bvandyk-0 wrote: :rillian, I've taken a look and can't repro thus far. I'm going to hold the needinfo while I wait for some new hardware to arrive and then I'll be able to test this on OSX and see if I have any more luck. Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/8 ------------------------------------------------------------------------ On 2018-04-11T15:36:00+00:00 Bvandyk-0 wrote: I've been unable to repro this on OSX and a couple of other systems I've tested. Isaac, are you still seeing issue? If so, could you please gather a log using MOZ_LOG=MediaFormatReader:5? Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/9 ------------------------------------------------------------------------ On 2018-04-12T04:45:55+00:00 S-bugzilla-mozilla wrote: Created attachment 8967249 newlog.log.gz Log from `MOZ_LOG=MediaFormatReader:5 /Applications/Firefox\ Developer\ Edition.app/Contents/MacOS/firefox-bin` I changed the playback rate about 5-10 secs into the video playing Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/10 ------------------------------------------------------------------------ On 2018-04-12T04:51:46+00:00 S-bugzilla-mozilla wrote: Created attachment 8967250 firefox.mp3 A loopback recording of https://www.youtube.com/watch?v=UzsnzeaOD84 played at 4x speed from firefox. I have the raw wav file if needed. Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/11 ------------------------------------------------------------------------ On 2018-04-12T04:52:28+00:00 S-bugzilla-mozilla wrote: Created attachment 8967251 opera.mp3 A loopback recording of https://www.youtube.com/watch?v=UzsnzeaOD84 played at 4x speed from Opera. I have the raw wav file if needed for further analysis. Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/12 ------------------------------------------------------------------------ On 2018-04-12T04:55:21+00:00 S-bugzilla-mozilla wrote: If you play the recording from firefox, you can see that the words are mangled, compared to that from Opera. You can clearly tell that some audio segments are completely skipped over if you slow down the playback. The audio from Opera isn't that different, from what I can hear, to that of Chrome's. I haven't tested it on Safari. I can upload wav files for analysis if you need them. Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/13 ------------------------------------------------------------------------ On 2018-05-20T09:43:50+00:00 S-bugzilla-mozilla wrote: I can reproduce this bug on version 61.0b6, currently the latest release for Developer Edition. Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/14 ------------------------------------------------------------------------ On 2018-07-16T03:59:25+00:00 Alex Korchemniy wrote: This is the #1 reason I don't use Firefox for YouTube. Chrome plays back audio smoothly at 4x. Firefox sounds like it's dropping samples after 2x. This might not be problematic for music, but extremely problematic for speech. I started digging into the Firefox code for playback adjustments. It looks like Firefox uses the SoundTouch library: https://dxr.mozilla.org /mozilla-central/source/media/libsoundtouch/src/RateTransposer.h. I'm not sure if this bug exists upstream. Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/16 ------------------------------------------------------------------------ On 2018-09-15T12:22:56+00:00 Plurtu wrote: I did a visual comparison of the two samples in Audacity and while they look similar there are occasionally dropped words which are detectable in playback. For example 8 seconds into the Firefox sample (27 seconds in original) is the line "So for people who don't know" and the word "for" is missing. The intro tune at 5 seconds has a wavy max amplitude when it should be relatively flat and have a faster beat. I recorded my own sample on Nightly 64 Ubuntu 18.04 and was able to reproduce the issue. Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/18 ------------------------------------------------------------------------ On 2018-09-15T12:24:34+00:00 Plurtu wrote: Created attachment 9009353 missing-word.png Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/19 ------------------------------------------------------------------------ On 2018-09-15T12:25:11+00:00 Plurtu wrote: Created attachment 9009354 wavy-intro-tune.png Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/20 ------------------------------------------------------------------------ On 2018-12-27T05:29:35+00:00 Plurtu wrote: *** Bug 1515054 has been marked as a duplicate of this bug. *** Reply at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1654480/comments/21 ** Changed in: firefox Status: Unknown => Confirmed ** Changed in: firefox Importance: Unknown => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1654480 Title: HTML5 sound choppy when played at 4x To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1654480/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
