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Apple Pro Res Question;

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Jonny Cates
Apple Pro Res Question;
on Aug 19, 2013 at 10:18:12 pm

I have a ton of files to convert to Pro Res, all 1920x1080 HD, but shot with (3) different cameras. I used Streamclip to do a test on one file that was 45.4 mb originally. After the 422 conversion, that same file now becomes 363.3mb! That 8 times bigger! I have used this program before, but that seems awfully big to me.
Is this size growth correct? Am I clicking or selecting something wrong in the 422 choices? Under the 422 selection, there are two choices that are identical, but I don't know the difference between them....

Jonny Cates


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Shane Ross
Re: Apple Pro Res Question;
on Aug 19, 2013 at 10:32:55 pm

[Jonny Cates] "Is this size growth correct?"

Most likely.

1 hour of ProRes 422 1920x1080 29.97fps = 75.3GB
1 hour of ProRes HQ 1920x1080 29.97fps = 112.4GB
1 hour of ProRes LT 1920x1080 29.97fps = 52.6GB

If the frame rate is lower, say 23.98, then the file size will be lower:

1 hour of ProRes 422 1920x1080 23.98fps = 60.4GB

How long of a clip do you have that's 363MB? The only way I get something that small is if I choose ProRes Proxy, and the clip is one min long 1080p 23.98. One min of ProRes 422 1080i 29.97 is 1.3GB.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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Jonny Cates
Re: Apple Pro Res Question;
on Aug 20, 2013 at 8:25:56 am

Shane... the clip I was testing is 10 seconds long. It's size before conversion is 45.4MB. After, 363MB.

Original clip info...

Dimensions: 1920 x 1080
Codecs: H.264, AAC, two channels
Color Profile: HD (1-1-1)
Duration: 00:10
Audio Channels: 2
Total bit rate: 35,350
Movie Information: JVC

FPS on camera was 60i

Jonny Cates


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Shane Ross
Re: Apple Pro Res Question;
on Aug 20, 2013 at 8:38:23 am

Yup...all very normal. Bigger hard drives are in order.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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Dave LaRonde
Re: Apple Pro Res Question;
on Aug 20, 2013 at 12:32:51 am

The difference in the file sizes is what you'd expect. Video recorded by cameras is very often in ACQUISITION codecs, which aren't the best for editing, then adding effects, then color correction, etc. They're lossy codecs. The image quality will go south.

However, ProRes holds up in post-production very nicely. It comes at the expense of larger file sizes.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Jonny Cates
Re: Apple Pro Res Question;
on Aug 20, 2013 at 8:28:47 am

Thanks for the info Dave. I see yet another, external hard drive in my future.

Jonny Cates


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Dave LaRonde
Re: Apple Pro Res Question;
on Aug 20, 2013 at 9:02:39 pm

Oh, indeed! Possibly quite a few more. Drives don't last forever.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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