[FFmpeg-devel] [PATCH] Improved AC3 decoder level support (heavy drc, dialnorm)

Michael Niedermayer michaelni at gmx.at
Wed Aug 27 15:01:37 CEST 2014

On Tue, Aug 26, 2014 at 09:35:53PM -0400, Jean-Francois Thibert wrote:
> On Tue, Aug 26, 2014 at 7:40 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
> > do you have a testcase/sample to test this ?
> >
> I don't have any specific sample but this can be tested with any
> broadcast or most disc source using AC3 audio. I just tried with the
> Broadway-5.1 clip from samples.mplayerhq.hu/A-codecs/AC3 and it
> contains both types of DRC and can be decoded in multiple modes
> ./ffmpeg -heavy_compr 1 -target_level -20 -i Broadway-5.1.ac3 -acodec
> pcm_s16le -ac 2 BroadwayHeavyDRC.wav
> ./ffmpeg -drc_scale 1 -target_level -31 -i Broadway-5.1.ac3 -acodec
> pcm_s16le -ac 2 BroadwayLightDRC.wav
> ./ffmpeg -drc_scale 0 -target_level -31 -i Broadway-5.1.ac3 -acodec
> pcm_s16le -ac 2 BroadwayNoDRC.wav

works, applied


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Complexity theory is the science of finding the exact solution to an
approximation. Benchmarking OTOH is finding an approximation of the exact
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