Greg Oliver (12020-04-14): > We currently use ffmpeg to combine 2 streams (telephony codecs) into > mp3/wav/flac, etc.. This is no problem - we use: > > ffmpeg -ar 8000 -y -f mulaw -i calls/example.g711a.ulaw -ar 8000 -f mulaw > -i calls/example.g711b.ulaw -filter_complex "[0:a][1:a]amerge[aout]" -map > "[aout]" output.wav > > If we have multiple legs of a recording, we just use linux `cat' to > concatenate them prior to ffmpeg processing (we have raw audio frames > without headers, etc, so this works fine). > > Due to Covid, almost all of our customers have moved their call centers to > employee homes, so we have mixed codec calls and the necessity has arose to > generate audio files accordingly. It is easily accomplished with multiple > temporary files, but I would like to clean it up and have been unsuccessful > in coming up with a single string to accomplish it. > > Example using these files (suffix denotes codec - a and b are each side of > a call): > > 18_17_248.g729a > 18_17_248.g729b > 19_18_440.g711a > 19_18_440.g711b > 20_01_886.g729a > 20_01_886.g729b > > Current method to concatenate and transcode to wav putting caller on left > and callee on right: > > ffmpeg -f g729 -i 18_17_248.g729a -f g729 -i 18_17_248.g729b > -filter_complex "[0:a][1:]amerge[aout]" -map "[aout]" out_1.wav > > ffmpeg -ar 8000 -y -f mulaw -i 19_18_440.g711a -ar 8000 -f mulaw -i > 19_18_440.g711b -filter_complex "[0:a][1:a]amerge[aout]" -map "[aout]" > out_2.wav > > ffmpeg -f g729 -i 20_01_886.g729a -f g729 -i 20_01_886.g729b > -filter_complex "[0:a][1:]amerge[aout]" -map "[aout]" out_3.wav > > ffmpeg out_1.wav out_2.wav out_3.wav final.wav > > My goal is to syntactically accomplish this with one ffmpeg string (not > pipes, ; or && bash syntax). > > I would appreciate any insight - I have tried everything I can find / think > of without success.
I suspect what you need is the concat filter. But you were not clear enough about what exactly you are trying to achieve. Maybe make diagram? Regards, -- Nicolas George
signature.asc
Description: PGP signature
_______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
