[x264-devel] Re: Deblocking Filter in X.264

[Loren Merritt]

On Mon, 2 Oct 2006, Faisal Abdullah wrote:

> I have to inquire that if the Deblock filter in X.264
> is exact implementation of standard. Does this filter
> shows conformance for ITU Test Streams for decoder.

x264 isn't a decoder, so it is meaningless to ask whether it decodes 
compliantly.
But x264 does encode compliantly. i.e. if you dump x264's internal buffers 
for the content of encoded frames, you get results identical to what the 
reference codec outputs upon decoding the bitstream.

> As I have seen in the code for strength calculation of
> the filter that motion vector comparison is somewhat
> approximate.

x264 does not implement every piece of the standard, but it is compliant 
in its implementation of the pieces that it does use. For example, the 
computation of deblocking strength omits several conditions that are 
listed in the standard, but the situations that those conditions apply to 
can never occur in x264, since x264 chooses not to generate such streams.

--Loren Merritt

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