[FFmpeg-devel] [PATCH] avfilter: add loudnorm

[Gaullier Nicolas]

>Most broadcasters are now specifying mandatory loudness targets for source material, which is usually supplied as a target integrated loudness value and a target maximum true peak. Loudness normalization is easy for files with sufficient headroom for linear gain adjustments, difficult for files with not enough headroom, and even more difficult for live streams – this filter handles all these situations. The loudnorm algo is basically a loudness-tuned AGC which was designed to honor local dynamics, followed by a look-ahead true peak limiter. Using normal parameters the result is usually imperceptible, even with very dynamic source material such as classical music. This filter should be a major boon to broadcasters and digital distribution people, since the only software currently available that does this kind of thing is commercial, and for the most part very expensive (Minnetonka, Skylark, Nugen, etc.)

+1
This is a very important and expected feature for broadcasters, I support that too!

Nicolas