[x264-devel] Behaviour of Annex B encoding: bug or not?

[Måns Rullgård]

Jason Garrett-Glaser <darkshikari at gmail.com> writes:

> 2010/1/7 Måns Rullgård <mans at mansr.com>:
>> Måns Rullgård <mans at mansr.com> writes:
>>
>>> Jason Garrett-Glaser <darkshikari at gmail.com> writes:
>>>
>>>>> It's only because x264 generates more complete session information, which
>>>>> includes several near-zero multi-byte integer parameters that result in
>>>>> escape-required patterns of traffic, that we are seeing the problem.
>>>>> It doesn't occur when the units talk to each other.
>>>>
>>>> This is unrelated.  Simply due to random chance, statistically,
>>>> escaping bytes will be needed about once every 4 million bytes of
>>>> data--ignoring headers.
>>>
>>> Billion, surely?
>>
>> Or not.  But 16 million, not 4.
>
> Escape bytes are required for the sequences:
>
> 0x000000
> 0x000001
> 0x000002
> 0x000003
>
> These sequences occur 4 / 2^24 of the time, or  1 / 2^22 of the time,
> or roughly 1 / 4 million of the time.

Right.  Thanks for the explanation.  I'd forgotten the exact requirement.

-- 
Måns Rullgård
mans at mansr.com