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Mpv – A free, open-source, and cross-platform media player

(mpv.io)
1113 points Bluestein | 1 comments | 17 Aug 24 18:56 UTC | HN request time: 0.211s | source
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dither8 ◴[17 Aug 24 21:53 UTC] No.41278307[source]▶
In my input.conf file I've created filter keyboard shortcuts:

  F1 af toggle "acompressor=ratio=4,loudnorm"
  F2 vf toggle "bwdif"
First one is an alright dynamic range compressor (makes the loud parts quieter and quieter parts loud). Second is a deinterlace at default settings. These are standard ffmpeg filters and mpv let's you turn these on in real time.
replies(2): >>41279835 #>>41280567 #
1. Klover ◴[18 Aug 24 06:34 UTC] No.41280567[source]▶
Instead of using 2 compressors in tandem, it might be better to set the very good one to your preference:

  F1 af toggle "loudnorm=I=-14:LRA=1:tp=-1:linear=false:dual_mono=true"
The I=-14 is the target 'volume', which makes it as loud as YouTube and Spotify, setting it to -23 will be much quieter, but gives you more dynamic range. LRA=1 goes from 1-50, with 1 being the most compressing which is probably what you want in this case. TP=-1 sets the limiter to -1dB, which is plenty of clipping threshold because loudnorm calls the resampler for 192kHz before working in dynamic mode. Linear=false because we use dynamic mode here and cannot even use linear mode. Dual_mono=true makes -14 as loud for mono as stereo sources.

Since loudnorm adjusts volumes and sets limits for you, you can forego mpv's audio downmixing if your target is stereo and simply put all your channels together before bringing them to loudnorm:

  F1 af toggle "pan=stereo|c0=FC+LFE+FL+BL+SL|c1=FC+LFE+FR+BR+SR,loudnorm=I=-14:LRA=1:tp=-1:linear=false:dual_mono=true"