anaerin at gmail
Jun 21, 2008, 9:31 AM
Post #2 of 4
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Re: avcodec_dual_language flips on one channel (ticket #4976)
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Markus Schulz wrote:
> hello,
>
> i have a problem with understanding the avcodec_dual_language switch. On
> one channel (ARD[at]Astra 19.2E) it flips regular and perhaps randomly?
>
> for each pass from avformatdecoder.cpp:3372 mainloop (CODEC_TYPE_AUDIO
> switch) it looks like:
> avcodec_dual_language =0
> avcodec_dual_language =0
> avcodec_dual_language =1
> avcodec_dual_language =0
> avcodec_dual_language =1
> avcodec_dual_language =0
> avcodec_dual_language =0
> avcodec_dual_language =0
> avcodec_dual_language =1
> avcodec_dual_language =0
> avcodec_dual_language =0
> avcodec_dual_language =0
> avcodec_dual_language =1
> avcodec_dual_language =0
> avcodec_dual_language =0
>
> this results in splitting or not splitting to an additional stream and
> selecting a stream after them (for example the AC3 one) was impossible
> (without my hack, see ticket #4976).
>
> Starting the stream gives the following AFD output:
> -----------------------
> 2008-06-21 12:56:47.304 AFD: Opened codec 0x8ba8590, id(MPEG2VIDEO)
> type(Video)
> 2008-06-21 12:56:47.304 AFD: codec MP3 has 2 channels
> 2008-06-21 12:56:47.304 AFD: Opened codec 0x837f010, id(MP3) type(Audio)
> NO SPLITTING
> 2008-06-21 12:56:47.304 AFD: codec MP3 has 2 channels
> 2008-06-21 12:56:47.304 AFD: Opened codec 0xa33fe00, id(MP3) type(Audio)
> SPLITTING
> 2008-06-21 12:56:47.305 AFD: codec AC3 has 2 channels
> No accelerated IMDCT transform found
> 2008-06-21 12:56:47.305 AFD: Opened codec 0xa2d32c0, id(AC3) type(Audio)
> NO SPLITTING
> -----------------------
> SPLITTING means that AvFormatDecoder::ScanStreams splits the stream
> based on avcodec_dual_language.
>
> Any ideas? A bug in ffmpeg or the stream from this channel was crap?
> What can we do in the latter case?
>
I got no idea, but out of interest, was this during a program, or was it
during commercials? I'm thinking that different commercials have
different soundtracks, and as each is played the stream is re-set for
that soundtrack.
Just a thoery.
--
Robert Johnston
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