[FFmpeg-user] Is mixing of audio channels happening by default in ffmpeg?
Carl Eugen Hoyos
cehoyos at ag.or.at
Thu Jul 18 15:16:45 CEST 2013
Sam Marrocco <smarrocco <at> ringsidecreative.com> writes:
> -i "C:\Users\root\Desktop\MultiChannel.mov" -vcodec prores_ks
> -pix_fmt yuv444p10le -profile:v 3 -acodec copy -t 1
> -f mov "D:\\MultiChannel\MultiChannel.mov"
> The resulting quicktime appears to contain a single audio
> track with the contents of original 8 tracks mixed together.
This is very unlikely / no.
(The amerge filter allows to produce the result that you
The default action - since you did not specify a map
parameter - is to output one audio track.
See the console output:
> Stream mapping:
> Stream #0:0 -> #0:0 (rawvideo -> prores_ks)
> Stream #0:1 -> #0:1 (copy)
Input audio track 0:1 is copied into the output file.
Note that if you specify -map 0 (to copy all streams), all
output audio tracks except the first one will be silent
(because that is useful for - imo - typical - usecases).
This is probably trivial to fix but I am still searching
for somebody to help testing.
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