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How to add custom ffmpeg commands/filter in audio encoding i want to manually down-mix multiple channel audio to 2 channel/stereo with custom ffmpeg filter pls anyone help me ?

You can't add a custom comman line for downmixing with ffmpeg in Hybrid, since Hybrid does not use ffmpeg for downmixing.
If you need to do this, Hybrid is the wrong tool for you.
Note that you can however use a enter a custom downmix instruction for sox, if when "Audio->Base->Audio Encoding Options->Filtering->Downmix" is set to custom. (see: http://sox.sourceforge.net/sox.html#EFFECTS under 'remix')

Cu Selur

(16.04.2022, 08:23)Selur Wrote: [ -> ]You can't add a custom comman line for downmixing with ffmpeg in Hybrid, since Hybrid does not use ffmpeg for downmixing.
If you need to do this, Hybrid is the wrong tool for you.
Note that you can however use a enter a custom downmix instruction for sox, if when "Audio->Base->Audio Encoding  Options->Filtering->Downmix" is set to custom. (see: http://sox.sourceforge.net/sox.html#EFFECTS under 'remix')

Cu Selur

thank you so much