Which yields better quality ?

[iparout]

I am wondering. Which of the two will give me better quality :

A 2-pass encode with 130% compressibility check (the output file is undersized) or a 1-pass quality based encode with a Quantizer of 2 ?

I am talking about DivX 5.02 Pro.

[hakko504]

Well they should give you the same resulting file, but alas, this is not the case. Due to minor problems in the codec, it will produce some frames with quantizer > 2 if you use bitrate based encoding, so you will get the best possible quality if you use constant quality.

This is only true for DivX 5.02! DivX5.03 will give you quantizer = 1(!) if you use bitrate based encoding, and both DivX3.11 and XviD will produce the expected quantizer = 2 even if you use bitrate encoding if the compression test is >100%.

[iparout]

Aha I see. I'll choose the QUANTIZER=2. Thanks.

[DJ Bobo]

@ hakko504
DivX 5.03 really uses q1 in 2-pass encoding?! coo~l!
Thanks for the info! *thinking that my rips are better than I thought* :D

[hakko504]

@DJ Bobo

Read this about quantizer 1 in DivX5.03 (http://forum.doom9.org/showthread.php?s=&threadid=46135&highlight=quantizer)