• Compression Techniques

  SD ProRes

  Posted by Patrick De teliga on August 26, 2014 at 5:11 am

  Hi,

  I have recently edited and animated a music vid and have exported out the final files. One for web (YouTube etc) and one for HD Broadcast (1920 x 1080 ProRes).

  I have been requested to supply a file to the below specs
  (SD) FILE SPECS
  CODEC/CONTAINER: Apple ProRes 422/.mov
  FRAMERATE/FORMAT: 25fps progressive/PAL FORMAT
  RESOLUTION: 1024×576 (for standard-definition material only)
  AUDIO: Stereo/48khz/24-bit.
  File size between 700MB – 1GB.

  I cut it in Pr Pro CC and have exported it in the program itself and thru AME and I cannot get the file within the 700MB – 1GB range. I have also used Mpeg Stream Clip, Compressor 4 (just bought it before thinking that there would be more control over the data rate in the compression – not the case!) and I still cannot get the file under 1.48GB

  Any advice cow community?

  Any help would be great thanks
  Pat

  Patrick De teliga replied 11 years, 10 months ago 2 Members · 4 Replies
• 4 Replies

• 

  Ivan Myles

  August 26, 2014 at 12:50 pm

  Two things to verify:
  – 1024×576 square pixels; ProRes SD-PAL standard is 720×576 with rectangular pixels
  – ProRes 422 codec vs LT vs Proxy

  How long is the video?
• 

  Patrick De teliga

  August 26, 2014 at 10:03 pm

  Length is 3.46min and I’m using the straight 422 codec.

  And yes, I’ve been going with square pixels – as per the request sent.

  Thanks for your help!
  Pat
• 

  Ivan Myles

  August 27, 2014 at 1:52 pm

  ProRes bitrate is built into the codec. Here are your options:

  – use ProRes 422 and submit a 1.48GB file
  – use a lower bitrate codec to meet the file size requirement
  – use ProRes 422 and cut the length of the video to reduce file size

  The bitrate for ProRes 422 at 720×576-25p is listed as 41 Mbps, and it looks like your 1024×576-25p file was encoded at about 44 Mbps. If you use ProRes 422 LT with a bitrate around 28-30 Mbps the encoded file should be about 850-900MB. So then the client can decide whether they want ProRes 422 at 1.48GB or a ProRes 422 LT file that meets the size requirement.

  Do a web search on “prores white paper” for more information regarding ProRes bitrates.
• 

  Patrick De teliga

  August 27, 2014 at 10:10 pm

  Thanks for the help Ivan.

  I pushed one out in ProRes LT and have sent them that – it came in at 996.7MB – I figured that would be the best option for them. If they ask for full ProRes, I’ll just send them the larger file.

  Thanks again for the help mate!
  Pat

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