Good deal, I'm all set. Thanks again for your help! Steven -----Original Message----- From: mplayer-users-bounces at mplayerhq.hu [mailto:mplayer-users-bounces at mplayerhq.hu] On Behalf Of belcampo Sent: Wednesday, November 25, 2009 11:27 AM To: MPlayer usage questions, feature requests,bug reports Subject: Re: question concerning DAR and PAR Steven Miller wrote: > > You hit the nail on the head. I have to create video to be streamed from a > Darwin streaming server to quicktime clients. I'm only shooting for 'good' > quality as streaming via 'wireless' is another requirement. > > I'm still not sure about, > 704x480 (DAR 1.74) scaling to 836x480 on playback. Does this > resizing > Keep the 1.74 ratio or is it resizing to a resolution that provides > square pixels? Maybe both? > > I know I can look up the PAR for common dvd's > "http://en.wikipedia.org/wiki/Pixel_aspect_ratio"; easily enough. > > How would I find the PAR for my 704x480 with a DAR of 1.74:1? ffmpeg -i source.ext example: Video: mpeg2video, yuv420p, 704x576 [PAR 16:11 DAR 16:9], 10000 kb/s, 25 tbr, 90k tbn, 50 tbc It will display at 1024x576 Or mediainfo which is an app which give a whole lot of info > > Thanks for your help with this. I'm under the gun to get this going. Once I > get el capitan off my back, I'll be able to take the time to learn without > annoying people ;-) > > Steve > > > -----Original Message----- > From: mplayer-users-bounces at mplayerhq.hu > [mailto:mplayer-users-bounces at mplayerhq.hu] On Behalf Of belcampo > Sent: Wednesday, November 25, 2009 7:03 AM > To: MPlayer usage questions, feature requests,bug reports > Subject: Re: question concerning DAR and PAR > > belcampo wrote: >> Steven Miller wrote: >>> I have a dvd (ntsc 740x480) that crops to 704x480 (704:480:8:0) which >>> changes the DAR from 1.78:1 to 1.74:1. The resulting resolution (on >>> playback) ends up being 836x480. Before anyone asks, I have been reading, >>> but it's lot to absorb! If I understand correctly, 836x480 maintains the >>> 1.74:1 ratio? Another question is, 1.74 indicates a non square pixel, >>> doesn't your typical monitor use square pixels? I'm confused as to what's >>> happening here. >>> >>> If I wanted square pixels, would using the 'dsize' filter with a >>> resolution >>> that is divisible by 16 (scale=-1:-10,dsize=704:400 (this ends up with a >>> resolution of 704x400 and a 1.76:1 ratio)) give me square pixels, while >>> maintaining a mathematically and visually correct encode? >> dsize=704:400 will do this. >> Almost all video-sources were/are meant to play on TV, where AFAIK NEVER >> square pixels are used, as in your DVD-example. Square pixels will >> result in more pixels without ANY benefit. > Another point, if square-pixels is needed, and 400 is not a limit > somehow, is that reducing vertical pixels reduces percepted quality more > then horizontal. So for max square-pixel quality you would use the full > 836:480 values >> Only if you need to play on devices that don't accept, iPod and others, >> non-square pixels it's usefull/necessary to use square-pixels. >>> >>> >>> Thanks in advance! >>> >>> >>> >>> _______________________________________________ >>> MPlayer-users mailing list >>> MPlayer-users at mplayerhq.hu >>> https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users >> _______________________________________________ >> MPlayer-users mailing list >> MPlayer-users at mplayerhq.hu >> https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users > > _______________________________________________ > MPlayer-users mailing list > MPlayer-users at mplayerhq.hu > https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users > > _______________________________________________ > MPlayer-users mailing list > MPlayer-users at mplayerhq.hu > https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users _______________________________________________ MPlayer-users mailing list MPlayer-users at mplayerhq.hu https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
