On Mon, Apr 06, 2015 at 20:01:49 -0400, Dave Rice wrote: > > On Apr 6, 2015, at 4:32 PM, Pedro <[email protected]> wrote:
> > *ffmpeg -y -report -i input.mp4 -vf > > "split[a][b];[a]format=gray,histogram=mode=waveform:waveform_mode=column,vflip,split[c][d];[b]pad=iw:ih+256[padded];[c]geq=g=1:b=1[red];[d]geq=r=1:b=1,crop=in_w:220:0:16[mid];[red][mid]overlay=0:16[wave];[padded][wave]overlay=0:H-h" > > output.mp4* > Maybe unrelated, but you're forcing [a] to grayscale and then splitting that > to [c] and [d], then using geq to extract red from [c] and green from [d]. > Taking red and green from a grayscale image should give the same result. Can > you explain what you are hoping to achieve? I believe Pedro took that very code from the example on the given wiki page: https://trac.ffmpeg.org/wiki/FancyFilteringExamples#waveform I too had my problem understanding what it's supposed to do, and why. ;-) Perhaps a clean-up would be nice. Step by step instructions of how a filter chain was built up would be nice, but are apparently not within the scope of that page. Moritz _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
