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Compressing a quicktime file

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Terry Flaxton
Compressing a quicktime file
on Jun 26, 2017 at 1:35:54 pm

Hi I have put this post in Compression but I thought it may be best here: I need upload a high quality H264 or Mp4 of a quicktime pro res file that is an FCP Studio Output file. The high quality is about high detail and many dissolves happening. So I have an 11 gig file that I need get to under 5 gig and I simply went into quicktime conversion and output an H264 file which came in at 23 gig!

So I tried various things - direct FCP studio output from timeline - send to compressor etc and if I keep the quality high, I just get big big files (apart from using a compressed file from pro res)

So: what am I doing wrong and what can I do to get a reasonable 5 gig file?

(I haven't tried Squared file or importing into FCPX which I assume would transcode into something it likes)

Would it be worth changing the pro res into something else to start from?

Terry Flaxton

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John Rofrano
Re: Compressing a quicktime file
on Jul 4, 2017 at 3:06:14 pm

[Terry Flaxton] "So: what am I doing wrong and what can I do to get a reasonable 5 gig file?"
There is only one thing that determines file size and that's bitrate. If you want a 5GB file you must first determine how long the video is. Then depending on the length of the video you can do the math to determine the bitrate needed achieve that size. There are many bitrate calculators available on the Internet to help you.

For example: to get 1 hour of AVC/H.264 video into a 5GB file you would use an average bitrate of approximately 8Mbps (8,000 Kbps). Using the "multi-pass" option will produce the highest quality for a given bitrate.

So whatever setting you use in Compressor, adjust the Average Bitrate to get the file size where you need it to be once you determine that with a bitrate calculator.


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