Herman Robak wrote: > 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! > Good point, and I agree. My trouble was also with YUV4MPEG for DVD production, using mpeg2enc. If there is a 601 conversion filter which can be inserted into the pipe, then Cinelerra's YUV4MPEG menu can include it.
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