[FFmpeg-user] [HELP] ffmpeg how to arrange video , audio to the specific stream

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of Soho Soho123
> Sent: 06 August 2013 08:16
> To: FFmpeg user questions and RTFMs
> Subject: [FFmpeg-user] [HELP] ffmpeg how to arrange video , audio to the
> specific stream
> 
> hi All,
> 
> 
> the question is :
> how to set video to the specific stream
> how to set audio to the specific stream
> if I use ffmpeg to capture both video and audio simultaneously?
> 
> for example :
> ffmpeg command:
> ffmpeg -loglevel debug -f video4linux2 -r 30 -s 640x480 -input_format h264
-i
> /dev/video1 -f alsa -ar 48000 -ac 2 -i hw:0 -vcodec copy -acodec copy
> http://localhost:8090/feed1.ffm
> 
> I get the result :
> Output #0, ffm, to 'http://localhost:8090/feed1.ffm':
>   Metadata:
>     creation_time   : now
>     encoder         : Lavf55.12.100
>     Stream #0:0, 0, 1/1000000: Audio: pcm_s16be, 48000 Hz, stereo, 1536
kb/s
>     Stream #0:1, 0, 1/1000000: Video: h264, yuv420p, 640x480, 1/30,
q=2-31,
> -5 kb/s, 30 fps, 1000k tbn, 30 tbc
> Stream mapping:
>   Stream #1:0 -> #0:0 (copy)
>   Stream #0:0 -> #0:1 (copy)
> 
> how to modify the stream layout when capture video + audio?

Do you mean you want to reverse the stream order in this instance? In that
case, use the -map option to enumerate streams in the order you want them to
appear in the output:

-map 0:1 -map 0:0

will put the 2nd stream (video in this case) first.

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