Dana 26. 6. 2015. 21:26 osoba "Dave Rice" <d...@dericed.com> napisala je: > > Hi, > > > On Jun 26, 2015, at 11:27 AM, Paul B Mahol <one...@gmail.com> wrote: > > > > Signed-off-by: Paul B Mahol <one...@gmail.com> > > --- > > Waiting for comments and flames. > > Here are some comments and flames: > > I noticed that when I set min to a value greater than max. I get a crash with "Bus error: 10".
Good catch, I forgot about checking this. > > There may be an issue with negative values for min/max. When I run: > ffplay -f lavfi -i color=gray -vf signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255 > I see a line scroll across the center of the window. When I change min to -255 I see a line at ~3/4 down the frame, where I would expect -128 to be. Does the min and max expect non-negative numbers. > It is, but it doesn't draw what you expect. It should start from middle and either go up or down. > It could be helpful to include equations within foreground, such as: > ffplay -i movie.mkv -vf "signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255:foreground=if(gt(lavfi.signalstats.YAVG\,128)\,green\,red)" > or actually I could probably subsequently use geq to accomplish that. Will do, filter does not redraw whole frame it just updates columns so different colors for bars/dots make sense in special scenarios. I planned to do multiple graphs for multiple metadata but perhaps it is better to call filter multiple times and then blend frames together... > > Can you alias 's' for 'size' as many of the other filters do. Will do. > > This is very helpful, thanks! Do you have some other interesting idea worth implementing in filter I'm listening. > Dave > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
