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".
