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Originally Posted by Stereodude
FFMPEG's compression options don't work with Fast recompress Mode. Is that expected? I have a YUV420 source. I'm saving to YUV420. The compression settings show no conversion is necessary. But when I try to save the AVI file I get the following error, "Video format negotiation failed: Use normal-recompress or full mode". Isn't that going to result in no longer lossless handling of the input file to FFMPEG with a unnecessary color space conversion to RGB and back to YUV420?
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This is weird, will look into issue (repeated with FFV1 codec).
However, I have trouble getting "fast recompress" concept.
From docs:
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VirtualDub automatically chooses a intermediate video format to use between the codecs
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Indeed, historically the choice for output format is disabled.
To me, this is least conservative promise.
If you want to control unnecessary conversion, is is better to rely on the line "no conversion necessary" in normal/full mode. If the conversion is necessary you can still see if it is trivial like YUYV->YUV422 or involves any colorspace change.