On Tue, May 21, 2024 at 6:13 AM Mark Filipak <markfilipak.i...@gmail.com> wrote:
> I've attached ebur128.jpg. It's only 37 k-bytes. > > Do you see that first 'shelf' just below LU = -13? I want to boost that > the most by percent, maybe > double the power (3 dB). I want to boost LU = 9 not at all, and I want to > boost everything below LU > = -14 not at all. > > So the transform I want would be like this: > LU = -18..-14 gets no boost. > LU = -14..9 gets linear boost to -7..9. > I assume 'LU' is Loudness Unit', eh? Heaven knows what the scale is and > whether the scale is linear > -- I'm used to dB, not LU. Of course, LU can't be dB because LU goes above > zero. > > Now, the range of 'loudnorm=measured_thresh' is -99..0, so 100 steps. > Heaven knows what the scale is > and whether the scale is linear. No matter: Pressing on... > > If LU = -18..9 maps linearly to 'measured_thresh' = -99..0, then Lu = -14 > is 'measured_thresh' = -85. > > I'll try that and come back to this thread to report the results. Wish me > luck. > > Disclosure: The audio and the video in ebur128.mp4 (upon which ebur128.jpg > is based) are not > perfectly synchronized and the more I listen to the audio while looking at > the slope of the graph > roll out, the less confident I become because the graph is not going up > and down with the audio. The > truth is, I don't know what the hell 'ebur128' is telling me! > > From long life experience I came to conclusion to just ignore kind of people like you. > --Mark._______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
