Compression

[lamapoo]

Greets to all,

I have come upon a problem. I have a 1 min clip in mpeg4 slow motion, 720x480, 18504k. I resized it to 512x380 and it gave me an output file of 18488k. I was under the impression that if you resize a clip it make the video file size smaller. But it wasn't really the case. Can anybody tell me why and what I'am not doing. I also made one at 320x240 and the file size was 18466k.

Thanks

[communist]

What compression / codec and at what setting are you compressing too?
You're target file probably does
a) not use the same codec
b) has a higher bit-rate then the source material
c) a&b

In order to reduce file size you should rather run it through a 2 pass encode using XviD / DivX and specify the new file-size in the 2nd pass.

[killingspree]

if you want smaller filesizes you can not simply decrease the AR but also have to decrease the bitrate

steve

[stax76]

if you want to ensure your bitrate isn't to high or to low make a compressibility test

[lamapoo]

The source file is X-Vid Mpeg 4 codec. The output is divx 5.0.2.

I tried lowering the bitrate but it still gives a bigger output file size. As for the two pass encoding. How do I do this with virtual dub?

Thanks.. your help is greatly apreciated!