#EXT-X-DISCONTINUITY Stalls playback

[rkrishna1]

I have been experimenting with hls.js, for some reason #EXT-X-DISCONTINUITY randomly stalls playback.

[mangui]

plz share debug logs and stream URL

[rkrishna1]

I am trying to loop a 7 second video in this case.

#EXTM3U #EXT-X-VERSION:4 #EXT-X-TARGETDURATION:9 #EXT-X-MEDIA-SEQUENCE:0 #EXTINF:7.300000, #EXT-X-BYTERANGE:3304852@0 out.ts #EXT-X-DISCONTINUITY #EXTINF:7.300000, #EXT-X-BYTERANGE:3304852@0 out.ts #EXT-X-DISCONTINUITY #EXTINF:7.300000, #EXT-X-BYTERANGE:3304852@0 out.ts #EXT-X-DISCONTINUITY #EXTINF:7.300000, #EXT-X-BYTERANGE:3304852@0 out.ts #EXT-X-DISCONTINUITY #EXTINF:7.300000, #EXT-X-BYTERANGE:3304852@0 out.ts #EXT-X-DISCONTINUITY #EXTINF:7.300000, #EXT-X-BYTERANGE:3304852@0 out.ts #EXT-X-DISCONTINUITY #EXTINF:7.300000, #EXT-X-BYTERANGE:3304852@0 out.ts #EXT-X-ENDLIST

[mangui]

that is neither a debug log nor a stream URL

[jlmcdonald]

I've been having the same problem; it isn't all discontinuities, but consistently will be the same ones. Only seeing this in Chrome 46+ and up on Windows and Linux (haven't tested Mac OSX); Firefox works great with my problem stream, as does Chrome for Android.

Here's the output of chrome://media-internals:

Timestamp Property Value
00:00:00 00 pipeline_state kCreated
00:00:00 00 event WEBMEDIAPLAYER_CREATED
00:00:00 00 url blob:http%3A//tagging.vidangel.com/d4b265f2-edd2-4fd4-940f-d4a40603a735
00:00:00 00 pipeline_state kInitDemuxer
00:00:01 131 info Audio codec: mp4a.40.2. Sampling frequency: 44100Hz. Sampling frequency(Extension): 44100Hz. Channel layout: 3.
00:00:01 131 found_audio_stream true
00:00:01 131 audio_codec_name aac
00:00:01 131 duration 76.12
00:00:01 133 info Video codec: avc1.6401e
00:00:01 133 found_video_stream true
00:00:01 133 video_codec_name h264
00:00:01 133 pipeline_state kInitRenderer
00:00:01 134 audio_dds false
00:00:01 134 audio_decoder FFmpegAudioDecoder
00:00:01 137 video_dds false
00:00:01 137 video_decoder GpuVideoDecoder
00:00:01 137 pipeline_state kPlaying
00:00:01 151 seek_target 0.036977000534534454
00:00:01 151 pipeline_state kSeeking
00:00:01 159 pipeline_state kPlaying
00:00:01 285 info Audio codec: mp4a.40.2. Sampling frequency: 44100Hz. Sampling frequency(Extension): 44100Hz. Channel layout: 3.
00:00:01 291 info Video codec: avc1.6401e
00:00:01 294 debug Generated splice of overlap duration 14400us into new buffer at 4082666us.
00:00:01 377 info Audio codec: mp4a.40.2. Sampling frequency: 44100Hz. Sampling frequency(Extension): 44100Hz. Channel layout: 3.
00:00:01 387 info Video codec: avc1.6401e
00:00:01 872 duration 76.003733
00:00:04 466 event PLAY

Attached is a debug log.

The stream URL is: https://s3.amazonaws.com/processing.vidangel.com/playlist-all.m3u8 -- the first discontinuity plays through just fine, but the second one causes the freeze. In fact, it looks that Chrome won't even load segments after the discontinuity into the player (even though dev tools confirms that all segments are being requested).

1450254328788.zip

[mangui]

ok got it.
there is a small hole in the buffer at discontinuity, between 2nd and 3rd fragment.
Buffered:[0.036977,13.061111][13.085422,76.003733]
24ms. looks like it is enough for the browser to freeze the video ...
I will check how to overcome this.

[mangui]

@rkrishna1 plz recheck
http://dailymotion.github.io/hls.js/demo/?src=https%3A%2F%2Fs3.amazonaws.com%2Fprocessing.vidangel.com%2Fplaylist-all.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true
should now work

[jlmcdonald]

Wondering if there might have been a regression in recent updates ... the player is no longer able to bridge discontinuities like those in https://s3.amazonaws.com/processing.vidangel.com/playlist-all.m3u8 (and, interestingly, the discontinuities show up visually on the scrubber timeline). Also getting a lot of "v.getVideoPlaybackQuality is not a function" errors in the dev tools console.

[mangui]

discontinuities should now be bridged correctly, plz recheck on your hand.

[jlmcdonald]

Yes ... the latest commits have fixed the problem once again. Thanks!