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

[Soho Soho123]

Hi ,

if I want to reverse the stream order ,
where I should put the "-map 0:1 -map 0:0"?

for exampe :

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
-map 0:1 -map 0:0 http://localhost:8090/feed1.ffm

is the order correct if I put the "map" option ?


2013/8/6 Francois Visagie <francois.visagie at gmail.com>

> > -----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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> > ffmpeg-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
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