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Activity Forums Apple Final Cut Pro X Big discrepancy between estimated size of exported file and actual size

  • Big discrepancy between estimated size of exported file and actual size

    Posted by Scott Herriott on February 20, 2023 at 4:44 pm

    Hey there,

    I’m using FCPX 10.6.5 on an IMac with a 3.8 GHz Quad-Core Intel Core i5, 16 GB of memory and running Ventura 13.2.

    When I exported a film of mine from the timeline using the Apple Pro Res 422 HQ codec it told me the est. size would be 104.11 GB. It came out at 38.49 GB.

    When I tried to upload the film to Filmhub (which requested the Apple Pro Res 422 HQ codec) I got a “compressed – please upload with higher bitrate” error message. (Oddly, I currently have the film up on Amazon Prime where it looks great).

    Any way to get the size of the film closer to the 104.11 GB estimate?

    Thanks in advance,


    Doug Metz replied 1 year, 5 months ago 3 Members · 31 Replies
  • 31 Replies
  • Ben Balser

    February 20, 2023 at 5:00 pm

    Pro Res won’t add anything, so whatever the native bit rate is of your footage, that’s what is going to be exported, that same bit rate. You need to make a custom preset in Compressor with the specs you need, then in FCPX, add it as an export preset. That will convert the bit rate to whatever Filmhub requires.

    Or just Export To Compressor and customize what you need if it’s a one-off export.

  • Scott Herriott

    February 20, 2023 at 5:01 pm

    Ben, many thanks for the quick response…appreciate it!

  • Scott Herriott

    February 20, 2023 at 5:05 pm

    Quick follow-up, how do you find out what the native bitrate is on the footage in the timeline?

    Thanks again,


  • Doug Metz

    February 20, 2023 at 9:38 pm

    Can you walk through the steps you’re taking to export your timeline?

    When exporting a timeline as a ProRes HQ master from within FC, the output file will be ProRes HQ. No settings change necessary.

  • Scott Herriott

    February 20, 2023 at 10:08 pm

    Thanks for responding Doug, appreciate it.

    – I activate the timeline which has my film on it

    – Then File > Share > Export File (default)

    – Export File window comes up, I go to Settings, set Codec to Apple Pro Res 422 HQ (which is required at Filmhub), tick the Include Chapter Markers box (it should be noted here that the est. size of the file says 101 GB…when I did it…it only came out to 39 GB…that discrepancy seems big, no?

    – File is done, I then upload to Filmhub…(6 hours go by).

    – When it’s done I get a message that says “compression – bit rate needs to be higher”

    I have this film up on Amazon already and it looks great…I do seem to remember that that exported file was bigger, unfortunately I can’t find it (needed to add chapter markers for the Filmhub version anyway).

    Below is some compression info from Filmhub

    Thanks for your time, Doug

  • Doug Metz

    February 20, 2023 at 10:58 pm

    Gotcha. Just to verify, the Settings panel would have ‘Video and Audio’ selected as the Format, then PRHQ, and check chapter markers. Nothing unusual on the Roles tab, I assume…

    What’s the resolution and duration of your timeline?

  • Scott Herriott

    February 20, 2023 at 11:08 pm

    Resolution is 1920 x 1080

    Length is 75 min. and 49 sec.

    And, yes, Video and Audio were chosen.

    Don’t see anything unusual in the Roles section.

  • Doug Metz

    February 20, 2023 at 11:20 pm

    That is strange, as you said, 39GB is definitely too small for that combination. Do you have Invisor or some other tool to analyze your output file?

  • Scott Herriott

    February 20, 2023 at 11:33 pm

    No. I’ll download Invisor and post the results here shortly.

    (Not sure if these two facts have anything to do with it…but I just, within the last couple of weeks got the FCPX latest update…editing with older version. Also, in the last couple of week upgraded my operating system to Ventura from, jeez, I don’t know, one from a few years ago.)

  • Doug Metz

    February 20, 2023 at 11:38 pm

    Haven’t tried the free one, so I guess we’ll find out! ;^)

    I’m exporting some client footage cut to the same duration, and exporting PRHQ overnight just to see what I get.

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