Le 16/07/2012 22:45, E Chalaron a écrit :
Nicolas could you send the Mencoder commands you ar eusing ?
I don't call but honestly, I'm using a very basic command with
absolutely nothing but the default parameters.
And I confirm, the results with mencoder are WAY better than with avconv.
Nicolas Ecarnot
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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Nicolas Ecarnot
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