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Bug 1692643 - Some videos of twitter fails to play
Summary: Some videos of twitter fails to play
Alias: None
Product: Fedora
Classification: Fedora
Component: firefox
Version: rawhide
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Martin Stransky
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2019-03-26 06:10 UTC by Akarshan Biswas
Modified: 2019-04-06 12:28 UTC (History)
11 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2019-04-06 12:28:52 UTC

Attachments (Terms of Use)

Description Akarshan Biswas 2019-03-26 06:10:11 UTC
Description of problem:
Almost everytime twitter videos on the twitter feed fails to play. Spamming the replay button does not help.

Version-Release number of selected component (if applicable):

How reproducible:
Randomly (Not always)

Steps to Reproduce:
1. Try to play a video on twitter

Actual results:
Video doesn't play

Expected results:
video should play as in other browsers

Additional info:
I got this JSON info from an addon:
"Container Type":"MediaSource"
"Audio Decoder(audio/mp4a-latm, 2 channels @ 44.1kHz)":"ffmpeg audio decoder"
"Audio Frames Decoded":"1"
"Audio State":"ni=0 no=0 wp=0 demuxr=0 demuxq=0 decoder=0 tt=-1.0 tths=-1 in=1 out=1 qs=0 pending=0 wfd=0 eos=0 ds=0 wfk=0 sid=100"
"Video Decoder(video/avc, 640x360 @ 0.00)":"shutdown"
"Hardware Video Decoding":"disabled"
"Video Frames Decoded":"0 (skipped=0)"
"Video State":"ni=0 no=0 wp=1 demuxr=0 demuxq=0 decoder=0 tt=-1.0 tths=-1 in=0 out=0 qs=0 pending:0 wfd=1 eos=0 ds=0 wfk=0 sid=4294967295"
"Dumping Data for Demuxer":"7f2b11a48400"
"Dumping Audio Track Buffer(audio/mp4)":"mLastAudioTime=0.096553"
"Audio Track Buffer Details":"NumSamples=130 Size=67160 Evictable=0 NextGetSampleIndex=1 NextInsertionIndex=130"
"Audio Track Buffered":"ranges=[(0.073333, 3.091927)]"
"Dumping Video Track Buffer(video/mp4)":"mLastVideoTime=0.000000"
"Video Track Buffer Details":"NumSamples=0 Size=0 Evictable=0 NextGetSampleIndex=4294967295 NextInsertionIndex=-1"
"Video Track Buffered":"ranges=[]"
"Compositor dropped frame(including when element's invisible)":"0"
"MediaDecoder=7f2b10da3600":"channels=2 rate=44100 hasAudio=1 hasVideo=1 mPlayState=LOADING"
"MDSM":"duration=57073000 GetMediaTime=0 GetClock=-1 mMediaSink=7f2b1f5b1940 state=DECODING_FIRSTFRAME mPlayState=1 mSentFirstFrameLoadedEvent=0 IsPlaying=0 mAudioStatus=idle mVideoStatus=waiting mDecodedAudioEndTime=96552 mDecodedVideoEndTime=0 mAudioCompleted=0 mVideoCompleted=0 "
"VideoSink":"IsStarted=0 IsPlaying=0 VideoQueue(finished=0 size=0) mVideoFrameEndTime=0 mHasVideo=0 mVideoSinkEndRequest.Exists()=0 mEndPromiseHolder.IsEmpty()=1"

Tried with also webrender and GL composting on.

Comment 1 Martin Stransky 2019-03-26 06:22:57 UTC
Can you post me any reference video which fails for you? Also can you try latest Firefox update - 66.0.1? Thanks.

Comment 2 Akarshan Biswas 2019-03-26 10:06:37 UTC
Tried with the 66.0.1. It occurs randomly for some videos. One example being
I don't know what's causing this.

Comment 3 Martin Stransky 2019-03-26 11:10:22 UTC
Can you try firefox-x11 package?

Comment 4 Akarshan Biswas 2019-03-27 06:27:10 UTC
I have tried with both firefox-x11 and MOZ_DISABLE_WAYLAND=1. Doesn't help. It only occurs on some videos.

Comment 5 Martin Stransky 2019-03-27 07:52:28 UTC
Please try mozilla binaries (
Also please try to create a new profile (

Comment 6 Akarshan Biswas 2019-03-27 10:56:46 UTC
I used the upstream tarball and launched it on fresh profile. Issue persisted.

However on a different website the video played for a brief moment and then the player crashed and I was able to get the error message.

"NS_ERROR_DOM_MEDIA_DECODE_ERR (0x806e0004) - virtual mozilla::MediaResult mozilla::FFmpegAudioDecoder<58>::DoDecode(mozilla::MediaRawData *, uint8_t *, int, bool *, mozilla::MediaDataDecoder::DecodedData &): FFmpeg audio error:-1313558101"

Comment 7 Martin Stransky 2019-03-27 20:07:55 UTC
Interesting. If that's caused by ffmpeg video backend, it may be reproduced locally. Please try to download the affected video (by youtube-dl for instance) and then play by ffplay utility from command line - can you see similar issues? And are you able to identify the problematic video so I can try to reproduce that? Thanks.

Comment 8 Akarshan Biswas 2019-03-31 06:05:37 UTC
@Martin Unfortunately youtube-dl doesn't support that website. But somehow I have downloaded the video. Played in ffplay and it played well without any issues. Unfortunately I am unable to identify the problematic video. But I know from the error that something is wrong with ffmpegaudiodecoder and Firefox.
The issue being random makes it more difficult to identify the real issue.

Comment 9 Martin Stransky 2019-04-01 11:03:37 UTC
There are reports that the upcoming 66.0.2 may fix that - see bug 1691831.

Comment 10 Akarshan Biswas 2019-04-02 10:08:13 UTC
Update: It appears to have fixed in 66.0.2 so far but I didn't test it on bluejeans. I will add a karma to the update once I test it with bluejeans. Thnx.

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