On Saturday 1 Apr 2017 22:58 CEST, Moritz Barsnick wrote: > On Sat, Apr 01, 2017 at 22:21:04 +0200, Cecil Westerhof wrote: >> I was asked to make videos during a ToastMasters contest. I had >> ordered a microphone for this, but sadly it did not arrive in time. >> So I needed to use the internal microphone from my Canon HS60 SX. >> Being away about ten meters from the speakers, their voices are >> much to soft. So I needed to pump up the audio. I did this with: > >> ffmpeg -y -i speaker.MP4 -vcodec copy -af volume=3 >> speakerAudioInc.MP4 Is that the correct way, or is there a better >> way? When using 4 there where to much distortions. > > If you only want to raise the volume linearly as much as possible > without distorting, you can analyze first: > > $ ffmpeg -i speaker.MP4 -vn -af volumedetect -f null - > > Look for the volumedetect output, especally this line: > > [Parsed_volumedetect_0 @ 0xbd47b80] max_volume: -7.7 dB > > 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. -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof _______________________________________________ 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".
