[x264-devel] Encoding error only on some pictures

[Jason Garrett-Glaser]

On Tue, Oct 16, 2012 at 3:01 AM, Jonathan Rosser
<jonathan.rosser at rd.bbc.co.uk> wrote:
> On 10/15/12 21:16, Jason Garrett-Glaser wrote:
>> I've spent a few hours today trying to replicate the problem (I can't
>> seem to get it to appear on my computer) and playing with
>> sliced-threading VBV modifications to try to improve its efficiency
>> yet again (all to failure as usual).  I don't think this is an
>> 'encoding error' per se, in that the bitstream is valid, but rather a
>> row of the image ended up with extremely low quality because of a
>> failure of ratecontrol.
>
> Interesting that you could not reproduce it.
>
> We've tried on a couple of different Ubuntu 12.04 x86_64 machines this
> morning, and also on 32 bit windows.

I'm testing on 64-bit Windows 7 with a 32-bit x264 build.  Since it's
related to the nondeterministic slice VBV code, the problem could be
very sensitive to the scheduler used.

Jason