On 18 January 2015 at 13:55, Michael Niedermayer <michae...@gmx.at> wrote: > On Sun, Jan 18, 2015 at 01:28:36PM +0000, Kieran Kunhya wrote: >> On 18 January 2015 at 12:22, Michael Niedermayer <michae...@gmx.at> wrote: >> > On Sun, Jan 18, 2015 at 02:52:59AM +0100, Hendrik Leppkes wrote: >> >> On Sun, Jan 18, 2015 at 1:02 AM, Nicolas George <geo...@nsup.org> wrote: >> >> >> >> > L'octidi 28 nivôse, an CCXXIII, Kieran Kunhya a écrit : >> >> > > Oops I misunderstood, you mean the software must comply with the users >> >> > wishes. >> >> > >> >> > Yes. >> >> > >> >> > > Anyway my argument is that BT601 should be the default for the these >> >> > > resolutions. >> >> > >> >> > If you want, but that must happen immediately when the contents enters >> >> > into >> >> > FFmpeg's data structure, not at a random point in the processing chain. >> >> > >> >> > >> >> Without arguing for or against BT.601 behaviour... >> >> >> >> nvenc should behave the same as libx264, or any other video encoder, if >> >> this patch makes it do that, then it should be applied. >> > >> > Yes, and AFAICS an earlier mail from philip indicates this is the case >> > " >> > Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 720x576 >> > [SAR 64:45 DAR 16:9], 25 tbr, 25 tbn, 25 tbc >> > >> > With libx264, I get the same SAR and DAR out. >> > >> > With nvenc, I get: >> > >> > sample_aspect_ratio=16:11 >> > display_aspect_ratio=20:11 >> > " >> > >> > In above example the user asks for a NON BT.601 format 720x576 at >> > SAR 64:45 and a DAR related to 720x576 NOT 702 or 704x576 of 16:9 >> > yet nvenc gives her something else >> >> Here's the point where I give up and start my own fork where things >> are done properly. > > please elaborate about where you disagree > > I think theres a misunderstanding between people on what some of the > aspect ratios mean and what they refer to
Read https://web.archive.org/web/20130328121216/http://lipas.uwasa.fi/~f76998/video/conversion/ and ETSI TS 101 154 (specifically the section on h264 aspect_ratio_idc): www.etsi.org/deliver/etsi_ts/101100_101199/101154/01.11.01_60/ts_101154v011101p.pdf Kieran _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
