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rachel320234447hep
Participant
September 1, 2023
Answered

Exporting video with 24 bit audio - which Quicktime codec will give me a smaller final file?

  • September 1, 2023
  • 3 replies
  • 2314 views

Hello

 

I need to deliver a video with 24 bit audio. So I'm using Quicktime instead of H.264. I've tried two of the settings but both are creating massive files (35GB for 14 minutes isn't feasible for my purposes). Is there a setting / technique someone can recommend to preserve the 24-bit audio but reduce the overall file size? 

 

Thank you. 

This topic has been closed for replies.
Correct answer Warren Heaton10841144

ProRes has predictable file sizes based on the target data rates.

1080p30 ProRes 422 HQ is about 1.3GB per minute and 1080p30 ProRes 422 LT is about 700MB/per minute.

 

The appendix starting on page 19 of the Apple ProRes White Paper provides target bandwidth/file sizes in GB per hour at common frame sizes and frame rates.

 

As far as getting 24-bit audio goes with ProRes in a QuickTime file goes, you should be able to get this by starting with a ProRes QuickTime preset and changing the audio sample size from 16 bit to to 24 bit.  

3 replies

W
Community Expert
Warren Heaton10841144Community ExpertCorrect answer
Community Expert
September 10, 2023

ProRes has predictable file sizes based on the target data rates.

1080p30 ProRes 422 HQ is about 1.3GB per minute and 1080p30 ProRes 422 LT is about 700MB/per minute.

 

The appendix starting on page 19 of the Apple ProRes White Paper provides target bandwidth/file sizes in GB per hour at common frame sizes and frame rates.

 

As far as getting 24-bit audio goes with ProRes in a QuickTime file goes, you should be able to get this by starting with a ProRes QuickTime preset and changing the audio sample size from 16 bit to to 24 bit.  

    R
    rachel320234447hepAuthor
    Participant
    September 10, 2023

    Thank you for the reference! 

    I did export using QuickTime ProRes and I changed the audio setting to 24 bit. I checked it all in the plane showing source and output settings. 

    However, even after trying multiple times, my resulting audio had been resampled to 32 bit. I checked every export with the use of audio software. 

     

    Although I am working with video, my main concern is audio. I cannot deliver audio that has been resampled in this way.

    R Neil Haugen
    R Neil Haugen
    Legend
    September 1, 2023

    If you simply want the smallest file sizes, then perhaps the ProRes LT or proxy.

     

    The intraframe codecs like ProRes, Cineform, and DNx all have variants depending on compression rates. Starting with 4444 w/Alpha on top, and a proxy type as the lowest. You can find their data bitrates online.

    Everyone's mileage always varies ...
      R
      rachel320234447hepAuthor
      Participant
      September 2, 2023

      Thanks for these ideas, I'll switch to one of those, and check out the rates as you suggest. 

      Jeff Bugbee
      Community Expert
      Jeff BugbeeCommunity Expert
      Community Expert
      September 1, 2023

      If you're using the QuickTime format, you still need to set a codec. What codec are you currently using?

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