Dave Rice <dave <at> dericed.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?
Assuming this is done to rule out bugs in FFmpeg: I find it unlikely that ffv1 is not lossless and that you will find out like this (as opposed to feed random data to the codec). I find it much more likely that a bug in the dpx decoder exists: Since you use the same decoder twice in above test you would not find such a bug. A bug in both gm and FFmpeg that leads to identical output seems less likely to me. Of course I do believe that framemd5 is useful to compare frames. Carl Eugen _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
