On Sat, 29 Dec 2007 09:09:45 +0100, Craig Lawson
<[EMAIL PROTECTED]> wrote:
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.
Let's take a step back, and figure out what is going on and what
The Right Thing To Do actually is...
Is this dark output only produced by YUV4MPEG, and not when you render
to MPEG video with Cinelerra directly? If so, why?
If ITU-R BT.601 is the right colourspace for conformant MPEG video,
then the codec should do that conversion when needed. It would be a
pain if certain codecs need "special treatment". The trouble is (as
far as I understand it) to discover when it IS needed. Cinelerra can
know that, but whatever command line you attach to the YUV4MPEG pipe
may not. And since the pipe interface is opaque to Cinelerra; it
doesn't know what the codec in the other end does, Cinelerra can not
decide if a conversion is needed or not.
Is the paragraph above a fair summary of the problem here?
Now, to see what would be the least fuss for the most users, we need
to know which codecs need the colourspace conversions, and which don't.
Bring on the special cases!
--
Herman Robak
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