The "Films By Kris" tutorials recommend using ffmpeg with "-vcodec
dnxhd" to convert video before handing it off to melt, because DNxHD
is apparently good for realtime processing with MLT and melt.

Is it (still) the case that DNxHD is the "best" for use with melt in
realtime mode (i.e. not writing to file)?

Although this is admittedly a fuzzy question, I'd imagine criteria for
"best" being something like:
  - fast to decode (if not also encode)
  - parallelizable (it looks like AVCHD can't be decoded multithreaded, e.g.)
  - good on other axes I'm not thinking of, maybe particular to MLT?

Thanks, and apologies for any misapprehensions!
Tom


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