Attached is a new port for audio/ffmpeg-normalize [1], which allows one to
normalise audio to a given volume level. A common use case is to transform
an audio file to a given LUFS level specified by the EBU R128 guidelines
[2]. In English, that means that your audio file can be made to sound
louder without sounding obnoxiously loud. This automates what otherwise is
an extremely cumbersome, manual, two-pass process with FFmpeg, and is
the suggested way to automate this process by FFmpeg [3].
ffmpeg-normalize also requires devel/py-tqdm (a Python progress bar), so
I've attached a port of that too.
Laurie
[1] https://github.com/slhck/ffmpeg-normalize
[2] https://en.wikipedia.org/wiki/EBU_R_128
[3] https://trac.ffmpeg.org/wiki/AudioVolume
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