[x264-devel] Re: parallising the encoder

[Loren Merritt]

On Wed, 6 Apr 2005, Tuukka Toivonen wrote:
> On Wed, 6 Apr 2005, Loren Merritt wrote:
>
>> You probably don't want to parallelize MBs. The extra predictions are no 
>> problem (just encode each line 2 MBs behind the previous), but it would 
>> mean you have to save residual coefficients and such, and delay bitstream 
>> writing.
>
> Hmm... i think i don't follow you. So, suppose one would have two threads and 
> frames with, say, 22x18 MBs. Which MBs would be encoded by which thread?

Thread 0 encodes row 0 (mb 0-21).
When thead 0 finishes mb 1, start thread 1 encoding row 1 (mb 22-43), 
making sure that it stays >= 2 mbs behind all the way.
When thread 0 finishes row 0, start it on row 2 (mb 44-65).
When thread 1 finished row 1 or thread 0 finishes mb 45 (whichever is 
later), thread 1 starts row 3.
...

Without CABAC RD, this produces results identical to the single-threaded 
case.

--Loren Merritt

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