[FFmpeg-user] HD > SD Down-Convert Prores Color

Kevin Wells kevwells at hotmail.co.uk
Sun May 10 20:11:33 CEST 2015

> To: ffmpeg-user at ffmpeg.org> From: cehoyos at ag.or.at> Date: Sun, 10 May 2015 14:27:29 +0000> Subject: Re: [FFmpeg-user] HD > SD Down-Convert Prores Color> > Kevin Wells <kevwells <at> hotmail.co.uk> writes:> > > if I emit the format=uyvy422 then the output file > > contains tiny green artefacts> > How can I reproduce this?> > Thank you, Carl Eugen> > _______________________________________________> ffmpeg-user mailing list> ffmpeg-user at ffmpeg.org> http://ffmpeg.org/mailman/listinfo/ffmpeg-userHi Carl, Take any HD Prores HQ file and use this command:ffmpeg -i HD_Source.mov -map 0:v -map 0:a -vf colormatrix=bt709:bt601,scale=720:576:flags=lanczos -vcodec prores_ks -profile:v 3 -vtag apch -vendor ap10 -pix_fmt yuv422p10le -f mov -c:a pcm_s16le SD_Source.movTake the SD_Source.mov and put it in Final Cut Pro 7, stick it on a sequence and add a Gamma effect (from image control) onto the video track in the sequence. Double click on the video in the sequence and goto the Gamma filter settings and turn the Gamma right up to 5. Now look at any black section of video and you will see it full of ting green artefacts.Adding in the format=uyvy422 gave me an almost perfect file, but not quite sure this is correct.I will attach a tiny video to this email for you to test.Let me know if you need anything else. 		 	   		  
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