If you’re doing 23.976fps (24000/1001) instead of 24fps, the rate would be 48000*960/1001
-af asetrate=48000*960/1001,aresample=48000
which works out to 46033.966, instead of 46080
If you want to slow it to 24fps, you can slow the audio down by encoding it like this:
ffmpeg -loglevel error -stats -n -i “The Wrong Trousers HD v2.mkv” -vn -sn -af asetrate=46080,aresample=48000 -c:a aac -b:a 192k -vbr 5 “The Wrong Trousers HD v2.mka”
And just remux it with the video in mkvtoolnix, de-selecting the original audio, and setting the video frame rate to 24fps.
I’m not well versed in ffmpeg, does this operation keep the correct audio pitch? I assume you’re posting this for the benefit of those who want to keep their file BD-compliant.
Pitch is lower.
I think the slowed down audio pitch sounds closer to what I remember from the VHS I used to watch.
The main part of it is this:
-af asetrate=46080,aresample=48000
It slows it down to 46080Hz rate, and then resamples it to 48000Hz.
This encodes to aac 192k:
-c:a aac -b:a 192k -vbr 5
If you want to slow it to 24fps, you can slow the audio down by encoding it like this:
ffmpeg -loglevel error -stats -n -i “The Wrong Trousers HD v2.mkv” -vn -sn -af asetrate=46080,aresample=48000 -c:a aac -b:a 192k -vbr 5 “The Wrong Trousers HD v2.mka”
And just remux it with the video in mkvtoolnix, de-selecting the original audio, and setting the video frame rate to 24fps.
I decided to start watching one of the uploads on Youtube, and I noticed the change in music immediately. It bugs me.
I’d like to get a copy with the original audio.