Final Cut Pro X output video is several times the size of input video

Even when I only make a few changes to a video, Final Cut Pro X creates an output file that is several times larger than the input file, even when I make sure that the resolution, frame rate, and output file format are the same. I bought Apple Compressor, but I do not see the option to get the file size down without cutting the resolution.

iMac Pro

Posted on May 2, 2021 3:54 PM

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Posted on May 12, 2021 12:09 PM

It’ll have the same data rate, but the media will be another generation of compression so at a low data rate it may deteriorate. The data rate is in the Video inspector. If you want to specify it you have to change it to Custom. Can’t post a screenshot at this time, but it’s there if you’re using H.264 or similar.

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May 12, 2021 12:09 PM in response to DTM81

It’ll have the same data rate, but the media will be another generation of compression so at a low data rate it may deteriorate. The data rate is in the Video inspector. If you want to specify it you have to change it to Custom. Can’t post a screenshot at this time, but it’s there if you’re using H.264 or similar.

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May 8, 2021 1:38 PM in response to DTM81

avc1 is H.264. aac is an audio codec. The export settings you selected use the same codecs; they just use a higher data rate. Open the two files in the QuickTime player and check them in the inspector window. You would need to use Compressor if you want to create a custom bit rate.

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May 12, 2021 12:05 PM in response to Tom Wolsky

Do you know how to select the data rate in Compressor v4.5.2? I'm having trouble finding instructions that match up to what I see.


So Final Cut Pro has been outputting with a data rate of 10Mbps, while the original file is 1.34Mbps. If I change it to 1.34Mbps, should it still have all the data of the original?


Thank you again.

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Final Cut Pro X output video is several times the size of input video

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