[mythtv] possible libavformat incompatibility with certain MPEG TS files

Rob Jones robj at fastmail.fm
Fri May 26 10:57:46 UTC 2006

Regarding the clip, the file is a bit large at over 100MB.

This links to a shorter clip (~10MB) which generates the same fault:


On Fri, 26 May 2006 09:55:41 +0100, "Rob Jones" <robj at fastmail.fm> said:
> Hi,
> I've been attempting to setup a dbox2 with mythtv (0.19 fixes branch).
> Streaming of transport streams from the dbox  works ok, but libavformat
> has issues reading the tables and assigning the PIDs when attempting to
> play back the stream in myth. It doesn't *seem* to be a problem with
> anything non-standard in the file, as dvbsnoop, tsreader analyzers have
> no problems showing its contents, with a PMT and video/audio PIDs, and
> mplayer etc. have no problems playing it back.
> Errors from libav look like this:
> mpegts_add_stream: at pid 0x18b4 with type 256
> mpegts_add_stream: stream #0, has id 0x18b4 and codec DVB_SUBTITLE, type
> Subtitle at 0x81502f0
> mpegts_add_stream: at pid 0x1804 with type 2
> mpegts_add_stream: stream #1, has id 0x1804 and codec MPEG2VIDEO, type
> Video at 0x81508c0
> mpegts_add_stream: at pid 0x18a4 with type 4
> mpegts_add_stream: stream #2, has id 0x18a4 and codec MP3, type Audio at
> 0x8150e90
> av_remove_stream 0x18a4
> av_remove_stream: no change to cur_st
> av_remove_stream: removing... s->nb_streams=3 i=2
> av_remove_stream: mpegts_remove_stream
> mpegts_remove_stream 0x18a4
> closing filter for pid 0x18a4
> av_remove_stream: renumbering streams
> av_remove_stream 0x1804
> av_remove_stream: no change to cur_st
> av_remove_stream: removing... s->nb_streams=2 i=1
> av_remove_stream: mpegts_remove_stream
> mpegts_remove_stream 0x1804
> closing filter for pid 0x1804
> av_remove_stream: renumbering streams
> av_remove_stream 0x18b4
> av_remove_stream: no change to cur_st
> av_remove_stream: removing... s->nb_streams=1 i=0
> av_remove_stream: mpegts_remove_stream
> This continues perpetually. It looks as though the stream gets assigned,
> but that libavformat thinks the PMT has changed, removes the stream and
> goes off to look again. Without a better knowledge of how libavformat
> works I can't tell for sure why this going wrong.
> I've posted the offending TS at:
> www.robjones.org/2022_20060525160800.mpg
> Any chance someone could take a look and see if they can figure it out?
> Cheers,
> Rob
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