[Libav-user] xbmc: streaming m3u8 "playlists" causes stuttering video (How to debug trace/ffmpeg libs?)

[Lars Hammarstrand]

Forgot to add how xbmc opens and handles (demux) ffmpegs streams:
"DVDDemuxFFmpeg.cpp
- Line 233<https://github.com/xbmc/xbmc/blob/master/xbmc/cores/dvdplayer/DVDDemuxers/DVDDemuxFFmpeg.cpp#L233>"
(xbmc main repro) /Regards, Lars.




On Sun, Feb 3, 2013 at 12:04 AM, Lars Hammarstrand <
lars.hammarstrand at gmail.com> wrote:

> Hello folks!
>
> We are having some problems with the ffmpeg libraries in xbmc. Streaming *
> HLS M3U8* urls often causes stuttering video. For example, when testing
> the m3u8 url below, BANDWIDTH "984000" and "2793000" streams are
> stuttering, the rest works as normal. If you download the streams (ffmpeg
> -c copy) and play them locally they all work.  All streams also works fine
> using mplayer2.  Please have look at the xbmc forum link:  "BUG No
> cache/buffer is used for m3u8 playlists, causes stuttering video"<http://forum.xbmc.org/showthread.php?tid=154016>.
>  Also, check this recorded example of a stuttering video (same as in forum
> post #8): "SVT.Play.Screen.Recording.mp4"<http://dl.dropbox.com/u/21767340/XBMC/SVT.Play.Screen.Recording.mp4>
> .
>
> Some questions:
>
>  1. Could this be it's buffering problem, i.e do we need to enable some
> sort of caching for m3u8 streams?
>  2. Are there any smart tricks we can use to debug/trace m3u8 streams with
> the ffmpeg libs? Any pointers, suggestions and ideas are appreciated!
>  3. Anyone seen a simular problem in the past?
> --
>
> Thanks in advance!
> Regards, Lars.
>
>
>
> http://svtplay7m-f.akamaihd.net/i/se//open/20130129/1230799-001A/DIVING_WITH_CRO-001A-23b378251ee65366_,900,348,564,1680,2800,.mp4.csmil/master.m3u8
>
> ========================================================================================================================
> #EXTM3U
> #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=*984000*,RESOLUTION=768x432,CODECS="avc1.77.30,
> mp4a.40.5"
>
> http://svtplay7m-f.akamaihd.net/i/se/open/20130129/1230799-001A/DIVING_WITH_CRO-001A-23b378251ee65366_,900,348,564,1680,2800,.mp4.csmil/index_0_av.m3u8?null=&e=b2a7ace1bf661c32&id=
> #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=*345000*,RESOLUTION=512x288,CODECS="avc1.66.30,
> mp4a.40.5"
>
> http://svtplay7m-f.akamaihd.net/i/se/open/20130129/1230799-001A/DIVING_WITH_CRO-001A-23b378251ee65366_,900,348,564,1680,2800,.mp4.csmil/index_1_av.m3u8?null=&e=b2a7ace1bf661c32&id=
> #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=*561000*,RESOLUTION=512x288,CODECS="avc1.66.30,
> mp4a.40.5"
>
> http://svtplay7m-f.akamaihd.net/i/se/open/20130129/1230799-001A/DIVING_WITH_CRO-001A-23b378251ee65366_,900,348,564,1680,2800,.mp4.csmil/index_2_av.m3u8?null=&e=b2a7ace1bf661c32&id=
> #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=*1677000*,RESOLUTION=1024x576,CODECS="avc1.77.30,
> mp4a.40.5"
>
> http://svtplay7m-f.akamaihd.net/i/se/open/20130129/1230799-001A/DIVING_WITH_CRO-001A-23b378251ee65366_,900,348,564,1680,2800,.mp4.csmil/index_3_av.m3u8?null=&e=b2a7ace1bf661c32&id=
> #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=*2793000*,RESOLUTION=1280x720,CODECS="avc1.77.30,
> mp4a.40.5"
>
> http://svtplay7m-f.akamaihd.net/i/se/open/20130129/1230799-001A/DIVING_WITH_CRO-001A-23b378251ee65366_,900,348,564,1680,2800,.mp4.csmil/index_4_av.m3u8?null=&e=b2a7ace1bf661c32&id
>
> =======================================================================================================================
> --
>
>
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