[x264-devel] Rare macroblock errors in recent x264...

[Jeppe Øland]

On Tue, Jun 12, 2012 at 4:33 PM, Jeppe Øland <joland at gmail.com> wrote:
>> I'm thinking some bugs might have crept into the latest version of
>> x264 (or recently at least).
>> I have used r2200 for a few weeks now, and very occasionally the
>> resulting file will have macroblock errors for a few frames.
>> So far I have only spotted it far into the encoded files (like 1+ hour
>> in), and the macroblocks are only wrong for 1 or 2 frames.
>> (And when they are wrong, they don't look crazy bad either)
>> Input file has been confirmed working fine.
>>
>> I'm going to see if I can narrow the problem down ... but just
>> encoding 30 seconds leading up to a known trouble spots has not
>> worked.
>>
>> Could r2197/2198 be causing problems?
>
> Re-ran the test with r2197.
> Problem still happens - though not in exactly the same place.
> (I guess that makes sense since r2200 would change the encode).
>
> Any ideas for versions to start trying to narrow it down?

Looks like a few mails to the group disappeared ... repeated here:

I did some more narrowing down:
    r2200 = Problem.
    r2197 = Problem.
    r2184 = Problem.
    r2164 = Problem (was much harder to spot with this version).
    r2145 = Haven't seen a problem yet ... will continue looking.
   (I don't have a lot of time for it at the moment, so it will take a while)

> I did some more narrowing down:
>    r2164 = Problem (was much harder to spot with this version).
>    r2145 = Haven't seen a problem yet ... will continue looking.

Is there anywhere I can download Windows in between these so I can
narrow down the change that causes the problem.
If not, I guess I'll have to install whatever recommended environment
needed to build it (unless Linux can cross-compile for Windows).

Regards,
-Jeppe