On Mon, Jun 29, 2020 at 10:44:04 -0400, Jim wrote: > AFAIK, ffmpeg does not have the ability to analyze the volume of every > sample throughout an audio file, find the greatest amplitude, calculate > the adjustment needed to make the loudest part of the file the maximum,
It does. > and then apply that scaled volume adjustment to the entire file. This makes this a two-pass operation, which your external tool probably also does. ffmpeg can analyze first: $ ffmpeg -i INPUT -map 0:a -af volumedetect -f null - and will find the absolute maximum of the first audio channel. Take the max value from the log (something like "max_volume: -18.1 dB"[*]), and use that value for an additionally inserted "volume" audio filter in your conversion. $ ffmpeg -i INPUT [...] -af volume="18.1 dB",otherfilters OUTPUT You thus only have an additional input analysis step. [*] Documentation says this will not cause any clipping, though I don't know what the behaviour is, if the volume is massively different across channels. I *believe* the maximum is safe to use (while the average is also an average across channels, by some kind of mixdown). > same question in my searching for a solution to this same message - this > is the first time I've read this. (I personally find this confusing as well.) > (Assuming I don't run into anything weird when processing different > video formats in the future of course. ;) ) I'm happy, happy, happy > about that! :) :) :) We like happy people. :-) Cheers, Moritz _______________________________________________ ffmpeg-user mailing list firstname.lastname@example.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".