Nicolas could you send the Mencoder commands you ar eusing ? Thanks E On 07/12/2012 07:40 PM, Nicolas Ecarnot wrote: > Le 11/07/2012 11:02, Herman Robak a écrit : >> It does bother me, for what it is worth. I think the problem is due to >> different luma range (MJPEG is full range; 0-255) and chroma sample >> alignment. >> I'd guess that the contrast range is first stretched, then truncated, >> leading >> to higher contrast _and_ some crushed blacks and clipped highlights. >> >> What to do? Find some other intermediate or proxy format. I'd suggest >> DNxHD for intermediates and intra-only low-bitrate h.264 for proxies. >> > > Thank you Herman for your answer. > > But during this time I tried to keep with my MJPEG conversion but now > using mencoder instead of ffmpeg/avconv. > > Astonishingly, the results are perfect : absolutely no issue with > chroma/contrast/brightness... > > What sound even weirder for me is that I thought avconv and mecoder > were both using the same libavcodec library to convert to mjpeg, and > thus, I was expecting the same results... >
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