[MEncoder-users] [mpeg4 @ 0x86f46cc]Error: 2pass curve failed to converge

[RC]

On Tue, 24 Oct 2006 23:03:49 -0700
Corey Hickey <bugfood-ml at fatooh.org> wrote:

> If so, you can try this simple patch.

Well, that helps with the problem I described, but in the testing
process I found another odd ratecontrol bug that this patch doesn't
really fix.

If I encode the first past with vqscale=2, then the second-pass with a
bitrate of 1000, it reports the bitrate is too low, and encodes at an
average of 1300.  That seems very strange, because it has no problem
encoding to 1000 when I use the bitrate for the first pass as well. 

I was trying this test because I noticed vqscale=31 is faster, and
wanted to compare the pass2 PSNR with each pass1 method:
vbitrate=1000/vqscale=31/vqscale=2.