Thank you for the answer. The sidechain file is an audio file, so, to my understanding, cannot be unipolar – but maybe I misunderstand? Best regards, Michael -- ******************************************************************* Michael Werzowa A-1190 Wien, Siolygasse 20/3B/6 +43 664 302 4511, fax +43 810 9554 185931 mi...@werzowa.at *******************************************************************
> Am 2024-11-18 um 10:05 schrieb Michael Koch <astroelectro...@t-online.de>: > > Am 18.11.2024 um 09:32 schrieb Michael Werzowa via ffmpeg-user: >> Dear List, >> >> I am new to the list. Searched the last two years of the list for >> „sidechain“, and did not find a hint. >> My usecase: >> Using an audio file to provide an envelope, that is applied to another audio >> file, modulating the gain of this file. >> With ffmpeg I easily can manage „ducking“, via direct call and using the >> python interface, but with my use case I run into errors or get the wrong >> output. >> For music mixing, this would be a typical use of sidecahin compression. >> ChatGPT 4o and Claude 3.5 Sonnet gave me a lot of advice, which all lead to >> the same: either the wrong effect, or an error. >> >> An example that does NOT work, although it should be the thing I want: >> >> ffmpeg -i data/to_be_modulated.wav -i data/sidechain.wav -filter_complex >> "[1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=2,highpass=f=20,agate=mode=downward:threshold=0:ratio=1:attack=0.0057:release=0.02:range=60:makeup=1[env];[0:a][env]amultiply" >> data/output-processed.wav > > I think this can only work if [env] is a unipolar (always positive) signal. I > doubt that it is. Write the output of the agate filter to a file and have a > look at this signal. > > Michael > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org <mailto:ffmpeg-user@ffmpeg.org> > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org <mailto:ffmpeg-user-requ...@ffmpeg.org> with > subject "unsubscribe".
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