[theora] Loseless Video Codec

Maik Merten maikmerten at googlemail.com
Fri Jan 8 05:00:31 PST 2010

On 08.01.2010 13:28, Philip Jägenstedt wrote:
> The video has already been captured, so there's no helping my data if
> ffenc_ljpeg isn't lossless (which would be a bit surprising, but
> possible). But in any case, I have really wanted a tool to verify that
> two videos are in fact pixel-identical and perhaps to show visual
> diffs. Does anyone know of such a tool?

Perhaps mplayer (or any other tool writing YUV video data) and dump_psnr 
(example program of libtheora, 
http://svn.xiph.org/trunk/theora/examples/dump_psnr.c) would work:

"mplayer -vo yuv4mpeg my-video-file" will dump the decoded stream to 

If "dump_psnr original.yuv ljpeg.yuv" gives an infinite score your most 
likely rather lossless ;-)


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