Doom9's Forum - View Single Post - Dialogue nightmode downmix preset for 5.1 DTS to 2.0 AAC stereo using ffmpeg and qaac

tebasuna51 · 7th December 2019, 12:29

You can try with the compand command of sox

You can see some samples of that command in https://forum.doom9.org/showthread.p...165#post779165
Don't work fine with avisynth soxfilter but you can try with sox command line.

Remember than Dolby Compression curves are based in normalized dialog (at -31 dB, for that the Null Band preserved), but not all sources are compliant with that and the output can't be like desired.

The Dolby recomendations (Dialog Normalization, DRC system) are good if all sources respect them, but there are many sources with high volume (TV commercials, Loudness war, ...) and you need turn up the volume always with Dolby compliant sources.

7th December 2019, 12:29	#13 \| Link
tebasuna51 Moderator Join Date: Feb 2005 Location: Spain Posts: 6,915	You can try with the compand command of sox You can see some samples of that command in https://forum.doom9.org/showthread.p...165#post779165 Don't work fine with avisynth soxfilter but you can try with sox command line. Remember than Dolby Compression curves are based in normalized dialog (at -31 dB, for that the Null Band preserved), but not all sources are compliant with that and the output can't be like desired. The Dolby recomendations (Dialog Normalization, DRC system) are good if all sources respect them, but there are many sources with high volume (TV commercials, Loudness war, ...) and you need turn up the volume always with Dolby compliant sources. __________________ BeHappy, AviSynth audio transcoder.