Exporting lossless from ProRes 422HQ (apch) file for Cinelerra (or anything non-FCP)

[elihubogan]

Hi all, first post so be gentle.

I have two .movs that are ProRes 422 HQ (apch), and I'd like to export them or convert them to another codec so I can edit them in Linux/Cinelerra (or anything non-FCP). I've been trying to use ffmpeg, but I'm not confident I'm getting lossless conversion (export file size is 20% of the original).

Does anyone do this regularly? I should be able to do it in FCP or Quicktime Pro, I think, but everything I export in Quicktime or Quicktime conversion ends up looking dark or otherwise terrible.

My ffmpeg command is:
"ffmpeg -i original.mov -sameq -vcodec mpeg4 newMovie.mov"

P.S. My files also came with a "Blackmagic" codec, so maybe I'm missing something else...

Thanks!

 

[WRP]

Open in quicktime pro. File > Export. Under quicktime movie options choose uncompressed 10-bit. It may have a different color space but it won't look bad.