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File size/present question for h.265.

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Christophe Pettus
File size/present question for h.265.
on Nov 26, 2018 at 11:06:04 pm

I'm using ffmpeg on the command line to encode video from a QuickTime ProRes 4444p DCI-resolution source to h.265, y420p. It's working just fine, but I noticed something very odd: If I change nothing but the preset, the file size goes down as the encoding speed goes up:

Preset and resulting file size:
  • veryslow: 5814379
  • slower: 5812081
  • slow: 5640739
  • medium: 5455779
  • fast: 5164506
  • faster: 5099833
  • veryfast: 5108824 (file size starts going up from this point)

My question is: This is rather the opposite from what I'd expect. Am I missing something obvious?


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