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

[Wayne Poll]

>-----Original Message-----
>From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of qw
>Sent: Friday, 13 May 2016 23:59
>To: FFmpeg user questions
>Subject: Re: [FFmpeg-user] one question about multiple stream in single file

>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


3D (stereoscopic) titles can have multiple video streams (LE, RE) although some are side-by-side (SBS) or some other form of anamorphic or interlaced presentation.


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 
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