På Sun, 17 Jul 2011 07:41:18 +0200, skrev mohan manu <mohan...@gmail.com>:
Hi, I have done shooting of my children movie with my canon 550d camera which records in h.264 50mbps bitrate vbr mov format. And have done editing with proxy files which were mjpeg codec for faster response in cinelerra. And next for grading those footages i have exported as tiff sequence removing all proxy files and workflow is going on nice. I have some doubt regarding the quality of the footages.
Have you seen something with your naked eyes that gave you doubts?
The big thing is my camera records at YUV color space with full video range i.e, 0-255. I choose 8bit RGB as my editing colorspace format. While i import these footages does cinelerra consider it as full range color HD footage? or does it takes on 16-235 video range?
I think that is handled by the codec, i.e. the codec scales, truncates or clamps the range. But I'm not sure how, when (or if?!) that happens in Cinelerra.
And does cinelerra do good job at converting YUV to RGB?
I have not tested that. Monty may have some insights to share on that.
Another workflow i am thinking of is converting all my original footage using 5DtoRGB which converts to RGB Huff uncompressed codec and the converter maintains full color range and does good YUV to RGB color conversion.
I'm looking into DNxHD as a proxy and intermediate codec. It looks promising on my laptop. The low bitrate 36Mb/s quality can play faster than full framerate, and the high bitrate 185Mb/s quality _almost_ plays smoothly, and has visually transparent quality. Fast forward and backward and aggressive seeking are pleasantly responsive, even for the 185Mb/s version. http://www.itbroadcastanddigitalcinema.com/ffmpeg_howto.html http://www.slashcam.com/EN/info/DNxHD-with-ffmpeg-or-mencoder-under-Ubuntu-434741.html Mind you, it doesn't accept 1920x1088, the native video resolution of my Canon EOS 7D, so I have to tell ffmpeg to scale or crop it to 1920x1080: ffmpeg -i <input file> -b 185M -s 1920x1080 -vcodec dnxhd -acodec copy <output file> -- Herman Robak _______________________________________________ Cinelerra mailing list Cinelerra@skolelinux.no https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
