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  • 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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