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Old 21st December 2001, 10:13   #1  |  Link
axeld
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Movie quality - DRF average

I found a little tool DRFAnalyzer, it analyzes whole movie and shows average DRF. I have some question about it:

1. Is it possible that DRF describes a movie quality?

2. Is it important if the movie was coded in low or fast motion? What is the difference in DRF in these codecs fot the same movie.

3. Why some movies has div3 and div4 in header? In such a movies DRF is very strange. It is x5 only or never less that x5.

4. What is standart deviation?

5. What is the best way to describe a movie quality without watching it?

axel d.
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Old 21st December 2001, 18:37   #2  |  Link
LotionBoy
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DRF is not an accurate measure of movie quality. It measures the compression of the movie. But because it depending on how compressible the movie is, the average DRF does not measure the quality. For example, a highly compressible movie could have an average DRF of 4, but would look better than a noisey movie with a DRF of 3. So Average DRF can give you an idea of a movie's quality, but is not a definete measure.

Low motion can use any DRF level (I think). Fast motion only uses DRFs above a certain level (5x I think). So Fast motion kills high bitrate scenes cause it uses high drfs on them.

standard deviation is a math function that basically chunks up a bunch of data. A standard deviation is one unit away from the average. Not sure how to explain it better than that without getting into the math.

Besy way to describe quality without watching? there ain't one. Bitrate and DRF give an idea, but only an idea.

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Old 21st December 2001, 19:30   #3  |  Link
MxxCon
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axeld, you said in another thread you found program that will export bitrate to a txt file..why not just import it into excel and make a graph?
you'll see if it's SBC or not..i think..
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Old 21st December 2001, 21:17   #4  |  Link
Taric25
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Sorry for being-off topic. I'm really bored here.

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Originally posted by LotionBoy
ain't
Sorry, no such word. Here's a ryme I learned in Grade school.

Ain't ain't a word
so ya' ain't gonna' say it
say ain't five times
and ya' ain't gonna' say it.

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