You only need the -vol option.
ffmpeg -i INFILE.mp4 -vol 4000 -sameq OUTFILE.mp4
hi! I hv question, how do I know what values to use to boost the volume?
btw, I love ur tutorial, so simple!
Trial and error, i wouldn’t suggest using this option to tune the volume on many files. I only used this option on videos, where the volume was recorded very low. I would not use this to amplify my movie collection. 😉
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