This is a rather esoteric issue, and it caused me grief for a long time.
Here's a UI proposal: offer an option to apply ITU-R BT.601 color space
conversion in the render dialog, with a tool tip suggesting you probably
want it for MPEG. The option would give a hint to the clueless, and
experts can use the RGB - 601 filter as they see fit.

Craig.


Bas Alphenaar wrote:
> Thank you, it worked!
>
> Craig Lawson wrote:
>> Bas,
>>   Try adding the "RGB - 601" filter to your video track(s). Configure
>> the filter for "RGB -> 601 compression" (the default). Does that make it
>> work?
>>
>> Craig.
>>
>>
>> Bas Alphenaar wrote:
>>> Hello Cinelerra people,
>>>
>>> Today I tried to render out a movie I made with Cinelerra revision
>>> 1045 via a YUV4MPEG stream. However, the resulting video seems to be
>>> too dark compared to the video in the compositor. I turned on "Use
>>> Pipe" and used mencoder with the following commands:
>>>
>>> mencoder - -ovc x264 -x264encopts bitrate=3000 -o %
>>> mencoder - -ovc lavc -lavcopts vcodec=mjpeg:vbitrate=3000 -o %
>>>
>>> I also tried x264 and MJPEG with ffmpeg and they have the same
>>> problem. I think the problem lies with the YUV4MPEG stream that
>>> Cinelerra generates, because no matter what the codec or the encoding
>>> program is, the video is always too dark. Any suggestions? Or maybe
>>> this is a bug?
>>>
>>> Bas Alphenaar
>>>
>>
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>>
>
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