On Sat, Jan 17, 2015 at 11:35:41AM -0800, Philip Langdale wrote: > There is a long sad story behind all this, but it's somewhat ambiguous as to > whether DVD content should be treated as 720 pixels wide or 704 pixels, with > 16 pixels cut off. If you decide is should be 704 pixels wide, you need to > adjust the sample aspect ratio to keep the final display aspect ratio correct. > > For reasons we are not privy too, nvidia decided that the nvenc encoder should > apply this aspect correction, whether you want it to or not. (I guess there > might be a flag for it, but if there is it's not documented). So, if you want > to transcode DVD content at the original size, you need to adjust the aspect > ratio information you pass to the encoder to compensate for their > 'correction'. > > This 'correction' is only applied to 720x480 and 720x576 content - and it does > so regardless of the input aspect ratio.
Oh my god, this is so horribly broken I vote for doing a "return -EBROKENAPI" and tell them we'll enable this when NVidia fixes their stuff. IMHO some features are not worth the hacks necessary. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
