[FFmpeg-user] one question about multiple stream in single file

[qw]

Hi Moritz,


I'll appreciate if you can show me some sample clips with multiple video streams, such as DVDs/Blu Rays that use it for various angles.

Thanks!

B.R.

Andrew





At 2016-05-13 16:45:49, "Moritz Barsnick" <barsnick at gmx.net> wrote:
>On Fri, May 13, 2016 at 12:02:52 +0800, qw wrote:
>> I know there maybe multiple audio streams in single file, because each audio stream has different channel, quality or language.
>> Is it likely that there is multiple video streams in single file? I haven't seen it before.
>
>It's totally possible. Whether it's likely depends on what you mean. I
>can create a sample for you, and it will be 100 % likely to have two
>video streams. ;-) [1]
>
>DVDs/Blu Rays use it for various angles. MPEG Transport Streams have
>this when carrying multiple programs. HLS has this, but technically,
>it's a bit like a playlist, and there are then several separate streams
>each one layer deeper which resolve to e.g. segmented MPEG-TS with only
>one video stream each. (ffmpeg's demuxer still presents you a multitude
>of video and audio streams on the top level HLS.))
>
>Nonetheless, if you're implementing something to handle streams, you'll
>need to at least be able to ignore, better even select multiple video
>streams.
>
>Moritz
>
>[1] ffmpeg -f lavfi -i testsrc -f lavfi -i testsrc2 -map 0 -map 1 -t 1 ~/tmp/test.mp4
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