Why 5DMKII h264 footage always loose quality when converted in ProRes??

K

kamidoko

New member
Hello,
I have the same problem with any software I used converting h264 to prores422 included 5DtoRGB. (I tryed in order to worst quality to best: MPEGSTREAMCLIP, COMPRESSOR, CANON E1PLUGIN and 5DtoRGB)
Due to the problems to edit h264 in FCP, I'm always working on prores422 but original h264 footage looks always better in color and quality (h264 has less compression artefacts and most of the times nicer color).
I also was thinking to edit in FCP with converted prores422 material and than, at the end, just substitute the edited footage with the original h264 clips. It works with some minor bugs, but as you introduce a cross dissolve or a filter, you have a visible quality loss in the rendered parts.
Someone has some different experiences or particular workflows?
Thank you.
 
There's no way you can't lose quality, or fidelity, when transcoding, so you're right. I've found that certain defects in the original footage (if they exist) will be heightened in the transcoded footage.

I have in fact edited with transcoded footage and then reconnected to the original H.264 files for mastering, but you'll possibly have to do some tweaking in that phase more than likely, because gamma and probably luminance will not match.
 
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