L'octidi 28 messidor, an CCXXIII, Darac Marjal a écrit : > You could try stripping the audio from the MPEG file, normalising it and > then recombining it. > > So, to extract the audio from the video, try something like: > > avconv -i video.mp4 -vn -acodec 'copy' audio.out > > (check "avconv -i video.mp4" to see what format the audio will be) > > And to recombine the audio, use something like: > > avconv -i video.mp4 -i audio.out -map 0:0 -map 1 \ > -vcodec copy -acodec copy new_video.mp4 > > That will combine stream 0 from the first file (which will PROBABLY be > the video, but check with "avconv -i video.mp4" again) with all of the > second file (the audio).
If using that kind tool, then better use a real recent FFmpeg (either using the one from Sid or building from source), because it has the following filters that allow to do more work directly: https://ffmpeg.org/ffmpeg-filters.html#volume (also present in avconv) -> to change the volume of the audio by a fixed factor https://ffmpeg.org/ffmpeg-filters.html#compand (also present in avconv) -> "compress or expand the audio's dynamic range" https://ffmpeg.org/ffmpeg-filters.html#ebur128 (NOT present in avconv) -> measure the volume https://ffmpeg.org/ffmpeg-filters.html#volumedetect (NOT present in avconv) -> same as previous, but less accurate and much faster Regards, -- Nicolas George -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20150716101418.ga2361...@phare.normalesup.org
