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...
--
Nicolas Ecarnot
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