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Estimating Compression Time

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Don Gaile
Estimating Compression Time
on Sep 22, 2006 at 6:54:57 pm

Can anyone share how you might estimate how long compression might take on a given video. I understand there are many factors involved in making that decision based on file size, etc. How do you budget and/or estimate time for clients. What is your rule of thumb. As an example, I have a 40 minute uncompressed DV NTSC file and they want it compressed to a wmv file.

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Craig Seeman
Re: Estimating Compression Time
on Sep 23, 2006 at 2:13:48 pm

Hi Don,

Your source is "known" so that's good.
You need to define your target(s) as a next step. There may certainly be more than one answer but here's some of the questions:
Desktop presentation, what computer power and how projected.
Web presentation, connections speed and decoding power of typical targeted viewer.
Will it be a 40 continuous piece on a streaming (mms type) server or will you break it into multiple parts for progressive download (http type).
What is purpose of the video - business to business or high end target, consumer with less expensive slower broadband, public service or in regions with heavy dial up or slow broadband access.

One you define your target test and time the encode at the given target settings for a 2 minute section and you'll have a good idea what 40 minutes will take, give or take.

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