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Originally Posted by alexVS
I'm not sure about avisynth.
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Better use ffmpeg.
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Must I open AC3 with DirectShowSource or NicAC3Source?
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Never use DirectShowSource, NicAC3Source is Ok (also ffms2 or L-SMASH)
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And DRC paramerer must be 0 or 1?
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Use the default (0) like with ffmpeg (-drc_scale 0)
The NicAC3Source (or FFAudioSource, or LWLibavAudioSource) output is already float (audio samples are 32 bit float), ConvertAudioToFloat do nothing.