On Thu, Apr 16, 2020 at 10:19 AM Nicolas George <geo...@nsup.org> wrote:
> 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 I ended up just keeping it as a script and getting the developers to incorporate it into our code. Thanks though! Since it is a script, a single bash call is not too intrusive. If we had some C programmers, I would have them use the ffmpeg libraries directly, but they are all just java heads.. -Greg _______________________________________________ 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".
