Thank you, I will have a look. And I will contact you directly, if this is ok? 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 13:07 schrieb Paul B Mahol <one...@gmail.com>: > > There is no standalone envelope filter in FFmpeg, but there is one in > Librempeg. (If envelope is standard definition by audio community) > > If you already have smooth envelope, you can use in FFmpeg > sidechaincompress filter (takes two input streams) + amix filter. > > I could help more if I can look at that py code that works. > > > Also see lavfi-preview tool, it can help building (complex) filter graphs > within GUI. > > On Mon, Nov 18, 2024 at 10:05 AM Michael Koch <astroelectro...@t-online.de> > wrote: > >> 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 >> https://ffmpeg.org/mailman/listinfo/ffmpeg-user >> >> To unsubscribe, visit link above, or email >> ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". >> > _______________________________________________ > 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".
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