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Ricardo Ellstein
Winrar for storage
on Jun 15, 2005 at 6:14:51 pm

I've always had a thing against erasing job files. I try to do it only when I really need to. Of course, archiving everything is expensive, which is why I've been thinking of using winrar to compress my files before I send them into storage.

The question is this:

I use uncompressed video on most of my projects. Will compressing with Winrar, and then decompressing downgrade my video in any way?

Thanks,

Ricardo


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Charles Simonson
Re: Winrar for storage
on Jun 15, 2005 at 10:43:25 pm

I doubt Winrar will seriously decrease filesize. It is a file-based compressor, working well on documents and packages. It does not have any video compressing standards though, and thus would only likely save you 1% at most. If you are in need of a compression method that offers good to great quality while retaining the ability to edit and not introduce many artifacts, then you should think about using video codec such as Motion-JPEG.


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Ricardo Ellstein
Re: Winrar for storage
on Jun 16, 2005 at 3:36:05 pm

Hi, thanks for your response. I'll tell you where I'm at.

I did a test run with winrar and my blackmagic-10 bit codec video, and it reduced the project size to less tha half (13 Gigs in about 2 hours).

I appreciate the advice to compress the video to motion JPEG, but that would mean compressing every idividual piece of video, and then re-linking them in my project before storing it away. It's clearly a good idea, but I'm looking for a solution that takes the least amount of time possible.

Thanks,

Ricardo



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Charles Simonson
Re: Winrar for storage
on Jun 16, 2005 at 7:39:32 pm

Interesting... didn't realize WinRAR could do that.

Anyway, I understood what you were trying to do as backing up you're finished movie, not the renders and source clips. But, if you're able to achieve 50% compression without having to mess with the codec, then by all means, use that method.


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Ben Waggoner
Re: Winrar for storage
on Jun 19, 2005 at 7:14:13 am

Any codec that uses entropy (aka lossless) encoding can't be compressed much with RAR or other entropy encoding solutions. However, true uncompressed doesn't have entropy encoding, and so 2:1 or so compression is pretty typical.

For some probably profound reason, most "interesting" real-world media, audio or video, only compress up to about 2:1 in typical use.


My Book: http://www.benwaggoner.com/books.htm
Squeeze and ProCoder tutorials: http://www.classondemand.net/benwaggoner/
Compression Class at Stanford: http://www.digitalmediaacademy.org/compression.html


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