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Compressing the cmpression

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Terry Flaxton
Compressing the cmpression
on Jun 26, 2017 at 1:13:20 pm

I need upload a high quality H264 or Mp4 of a quicktime pro res 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 - send to compressor etc and if I keep the quality high, I just get big files (apart from using a compressed file from pro res) what am I doing wrong and what can I do to get a reasonable 5 gig file?

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

A long term DP - likes 35mm and HD equally - changing with digital media - Began as a commercials editor !


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Lawrence Eaton
Re: Compressing the cmpression
on Jun 26, 2017 at 3:49:05 pm
Last Edited By Lawrence Eaton on Jun 26, 2017 at 3:56:03 pm

Terry,
my workflow is to:
1) output from FCPX as prores 422HQ
2) bring it into Compressor and use the Apple Devices>Apple Devices HD(Best Quality)
3) encode
4) change extension (if needed) from .m4v to .mp4

Initial file size: 3.22gigs
Final version: 120megs
Dimensions: 1280 × 720
Codec: AAC, H.264

It's all about your settings though, especially your bit rate, IMHO.

Lawrence


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Terry Flaxton
Re: Compressing the cmpression
on Jun 26, 2017 at 5:11:41 pm

That's close to what I did but s I say got 23 gig from an 11 gig file. As to the next post - yes of course - normally simple maths, but I got different.

A long term DP - likes 35mm and HD equally - changing with digital media - Began as a commercials editor !


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Craig Seeman
Re: Compressing the cmpression
on Jun 26, 2017 at 4:40:27 pm

It's very important and very basic math to understand compression and file size. Mostly math one might learn in middle school (junior high school).

File Size = duration x data rate.
Changing the data rate changes the size.



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Terry Flaxton
Re: Compressing the cmpression
on Jun 26, 2017 at 5:13:50 pm

That was my point really - I've been doing this since 1976 - from analog forward. But this time I got 23 gig from 11. So I wondered at that - are there any people out there that had this kind of anomaly?

A long term DP - likes 35mm and HD equally - changing with digital media - Began as a commercials editor !


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Lawrence Eaton
Re: Compressing the cmpression
on Jun 26, 2017 at 10:07:15 pm

Terry,
Maybe something corrupted in your project?

Have you tried copy/pasting into a new project and trying again?

Lawrence


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Terry Flaxton
Re: Compressing the cmpression
on Jun 27, 2017 at 8:31:31 am

I'll do that thanks...

A long term DP - likes 35mm and HD equally - changing with digital media - Began as a commercials editor !


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