Question about Bits/(Pixel*Frame) value...

[TempestGarden]

Hello.

I am converting a 24-25 min. episode from a DVD into an AVI file with the x264 codec using Gordian Knot. I am wondering if someone can tell me what approximate value that I should be aiming for with the Bits/(Pixel*Frame)??

The guide on this website suggests 0.17 but for my project that produces a very large file size and I thought the whole idea with this codec was to get great quality at a smaller file size. I am assuming that when the guide suggests that you go for 0.17, it is because in the example it is referring to a feature length movie that is most likely at least 1 1/2 hours long. Do I have the correct train of thought going here? What value should I shoot for when my "movie" is only 24-25 mins. in length?

Thanks.

[check]

x264 via GK produces a number of undesirable effects, such as audio skew an a non compliant video stream - I'd advise you to steer clear. For an alternate GUI, I recommend MeGUI - there's a link with a walkthrough in my signature.

As to bpp values, they are merely an empirical measure that should not be taken at face value. Since they do not take into account the complexity of the source (ie whether it is your grandma on the porch or the Matrix), it can only give a rought estimation at best, if you even know what typical values are. In other words, it's not too useful - x264 values in my encodes go from 0.08 up to 0.4+.

If you want a different metric that can help estimate quality for you, I'd suggest you check out 'enc', a compressibility tool.

[TempestGarden]

Thanks for the reply.

I have done a couple of test encodes so far and they have turned out pretty good with GK. They have weighed in around 130mb each, but again, I believe I will check out the tool that you suggested "enc" in order to get a more accurate estimation.

I also haven't run across any audio problems as of yet, but I will definitely check out the link to MeGUI in your sig and give that a shot. I have learned my way around GK pretty well, so I am hoping that MeGUI isn't too difficult to understand.

Again, thanks for the suggestions.