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HomeOfAviSynthPlusEvolution / L-SMASH-Works

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Add DRC parameter to LSMASH/LWLibavAudioSource() #5

Closed tebasuna51 closed 3 years ago

tebasuna51 commented 3 years ago

All players have a option to override the Dynamic Range Compression included in some AC3 files. Also ffmpeg have the parameter -drc_scale 0

But with LSMASH/LWLibavAudioSource() we can't override the compression and the decoded volume don't match the source volume when DRC data is present. This is a big problem to transcode audio.

Attached sample files encoded with DRC: Film Standard and DRC: None Samples.zip

The film file have only a Dynamic Range Compression min/max : -6,59 / 3,52 dB but DRC can go until -24/+24 dB

See also https://forum.doom9.org/showthread.php?p=1945716#post1945716

Asd-g commented 3 years ago

LSMASHSource_drctest.zip

Try this test build. It's x64 and only LWLibavAudioSource has the additional parameter float "drc_scale" (default 1.0).

tebasuna51 commented 3 years ago

Thanks Asd-g, your release 20210728 works fine for me with the drc_scale parameter.

Only a typo in the README: