Am 29.10.2025 um 11:10 schrieb Hervé ANSELME via ffmpeg-user:
Hello all,
I am using the release 6.1 of ffmpeg, running on Windows 11 Family OS.
I executed the following command :
ffmpeg -i "source movie" -y -loglevel error -sn ^
-map 0:m:language:fre -acodec aac -ar 48k -b:a 192k ^
-map 0:m:language:eng -acodec aac -ar 48k -b:a 128k -ac 6 -channel_layout 5.1
-mapping_family:a 255 ^
-map 0:v:0 -vcodec libsvtav1 "destination movie"
in order to encode differently the selected audio tracks.
I noticed in the destination movie, is that the french audio track has
effectively a 192k bitrate ;
but the english audio track kept the same bitrate as the english audio track of
the source movie, which is not 128k.
So, is there a way to have the wished audios bitrates, with different bitrates
among the selected audio tracks ?
If there is a way, how is it possible to do that ?
I'm sorry, I cannot answer the exact question but I believe I can give
you a hint.
You need to specify the attribute for the bitrate for every stream.
If you use numbers for the streams it would be
-map 0:a -c:a:0 aac -b:a:0 96k -ar:0 44100
You use map for the languag. This may still result in stream 0 and
-b:a:0 might be the solution
Best,
Bernhard
_______________________________________________
ffmpeg-user mailing list -- [email protected]
To unsubscribe send an email to [email protected]
