Hi Carl, > On Mar 9, 2015, at 9:24 AM, Carl Eugen Hoyos <[email protected]> wrote: > > Christoph Gerstbauer <christophgerstbauer <at> gmail.com> writes: > >> As far as I tested I can say (for the >> ffv1-supported pixelformats "gbrp10le" and >> "gbrp12le") it works lossless. All FrameMD5s >> are equal: > > (This is not the first time that I am slightly > surprised people use FFmpeg to prove that an > encoder of FFmpeg is lossless.)
Why is this slightly surprising? Isn’t verifying that an original source and a presumed lossless copy both decode to the same samples one of the primary purposes of framemd5? I put an article into trac about it: http://trac.ffmpeg.org/wiki/framemd5%20Intro%20and%20HowTo <http://trac.ffmpeg.org/wiki/framemd5%20Intro%20and%20HowTo>. >> The Original has LOGARITHMIC 10bit (RGB 10bit log) > > FFmpeg does not support logarithmic dpx > afaict. > If this is really a feature that would > help you, it would be possible to force > the "logarithmic" flag on encoding (but > I am not convinced this is really useful). > > (It is of course trivial to read the > information from the file but I wonder > how it would be useful given that FFmpeg > doesn't know what to do with the > information.) I would be in favor in preserving this info even if FFmpeg does not (presently) use the information. Dave > Consider to upload a sample (or post a > gm command line). > > Carl Eugen > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
