On Wed, Sep 23, 2020 at 03:30:25PM +0200, Marco Mircoli wrote: > Thanks Motitz, > this is a one pass norm. > Is there a way to implement 2 pass?
Yes there is a way, you can search google among other things. First run loudnorm to get report of loudness values, after that use that reported values in new, 2nd pass. > Thanks. > S. > > > Il giorno mer 23 set 2020 alle ore 14:42 Moritz Barsnick <[email protected]> > ha scritto: > > > On Wed, Sep 23, 2020 at 14:16:31 +0200, Marco Mircoli wrote: > > > Just bought a php script that use ffmpeg. > > > > I hope it's worth it. ;) > > > > > this is the line > > > $shell = shell_exec("$ffmpeg_b -i $audio_file_full_path -map 0:a:0 > > -b:a > > > 96k $audio_output_mp3 2>&1"); > > > > > > I'm wondering if it is possible to include in the conversion the audio > > > level normalization to R128 loudness profile. > > > I think it is possible, but I don't know how to do it :-( > > > > Sure. You just need to insert a filter to the command line. The R128 > > filter is even described here: > > > > https://trac.ffmpeg.org/wiki/AudioVolume#LoudnessNormalization > > > > > $shell = shell_exec("$ffmpeg_b -i $audio_file_full_path -map 0:a:0 > > -b:a 96k $audio_output_mp3 2>&1"); > > > > Just add the loudnorm filter: > > > > $shell = shell_exec("$ffmpeg_b -i $audio_file_full_path -map 0:a:0 -af > > loudnorm -b:a 96k $audio_output_mp3 2>&1"); > > > > To fine tune the filter's behavior, check ffmpeg's filters > > documentation, or > > > > $ ffmpeg -h filter=loudnorm > > > > Good luck, > > Moritz > > _______________________________________________ > > ffmpeg-user mailing list > > [email protected] > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > [email protected] with subject "unsubscribe". > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
