What is the size difference between Avi, Mpeg, and ram?

[skip2002]

What is the size difference between Avi, Mpeg, and ram?
If I can put 10 30minute AVIs on to a 700mb CD, How many 30minute Mpegs could I put on a CD?

[kinneera]

It's not that simple...Avi is a file type that is associated with a wide range of video codecs. If you can fit 300 min of AVI in less than 700MB, it is almost certainly DivX compressed, and pretty bad at that. Raw, uncompressed AVI would require something like 80-100GB to store that much video.

[leebo]

"What is the size difference between Avi, Mpeg, and ram?"

AVI is 13 inches, Mpeg is almost two feet, and Ram is just under 5 parsec's.

[darkelf]

This is something that I have been wondering as well. I have an older 8meg AIW-PRO that should be capable of using VirtualDUB in conjunction with Huffyuv. But I had a few questions about the compression ratio and filesize using Huffyuv.

Looking at the HOWTO sections, it states that the best results are given using the Huffyuv codec and doing some extra work to get it encoded.

I do not know what kind of "percentage values" you can alter using the Huffyuv codec, so I'm wondering what kind of hard drive space I would need for a 10minute clip with the 'best quality' Huffyuv setting enabled. How does this change when the quality setting is set to 'normal'?

I realize that this means different things to different people, but a general ball-park estimate would help greatly.

Also, is there some simple mathematics I can do to determine this for myself? Like one can determine monitor resolution maximums against the amount of video ram one has in their machine, color depth, etc.

Is there a fairly standard compression ratio that can be achieved using a Huffyuv codec from direct AVI?

Thanks in advance for your help!

-elf

[Vejita-sama]

The easiest way to work this out is run VDub, setup a capture, and then look at the bottom right to see the predicted MB/s needed. You can change the resolution, fps, etc. and see how this affects file size.

Huffyuv is a 'lostless codec' that produces about 2~2.5:1 compression (so divide the Vdub number by that).

DivX compression (like x(S)VCD) depends on the bitrate, use a bitrate calculator to determine settings and/or output.