• Compression Techniques

  Apple ProRes Compression Sizes

  Posted by Erin leigh Sirmans on October 20, 2015 at 12:58 pm

  I ran a file through Compressor to change the codec from H.264 to Apple ProRes; I did it once with the regular ProRes codec and once with the ProRes HQ. Even though the outputs had the same exact dimensions as the original, the file size for the HQ output was more than twenty times bigger (the file size for the regular ProRes output was much smaller, which was expected).

  Does anyone know why it comes out so much larger in file size using the HQ codec? The compression was not meant to change anything other than the codec. Thank you!

  Craig Seeman replied 10 years, 10 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Craig Seeman

  October 25, 2015 at 11:17 pm

  There are some variables tied to frame size and frame rate but otherwise the variations would be small.
  You should read Apple’s White Paper. Pages 21 and 22 for specifics on data rates.

  https://www.apple.com/final-cut-pro/docs/Apple_ProRes_White_Paper.pdf

Reply to this Discussion! Login or Sign Up