On Sat, Apr 01, 2017 at 23:41:21 +0200, Cecil Westerhof wrote: > > You can use then use that value for the volume filter - note the > > "dB" syntax: > > > > $ ffmpeg -y -i speaker.MP4 -vcodec copy -af volume="7.7 dB" > > speakerAudioInc.MP4 > > Almost all give 0.0 dB (12), or -0.0 dB (4). When using that there > will change nothing. Or am I overlooking something? > There is also a -0.4 dB and a -0.2 dB.
0 dB change indeed means no change (it's a logarithmic scale - sorry if that's too mathematical for you). In other words, the loudest parts of the file are already at maximum, and raising their volume will introduce clipping, what could be perceived as distortion. Apparently, even at "volume=3", it's not noticable to you yet, at "volume=4" it is. Did you try dynaudnorm? If "volume=3" isn't good enough for you, it could be a better solution. https://ffmpeg.org/ffmpeg-filters.html#dynaudnorm Moritz _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
