[x264-devel] Multithread in x264

[Son Minh Tran]

Dear Loren Merritt,
Thank you for the precious links. 
I didn,t catch  your idea as a answer for my second question. What do 
you mean with the term "commented" ?
Son

Loren Merritt a écrit :
> On Fri, 6 Jul 2007, Son Minh Tran wrote:
>
>   
>> 1. Before revision 607, each thread encodes one slice, whose size (in
>> MB) is equal to the frame size divided by No. of thread. You said
>> this method has penalty on bitrate. Is it due to the independent
>> treatment of slices in the same frame (therefore no spatial corellation
>> can be exploited at the boundary of slices)?. There is no synchron at
>> all between threads, isn't it ?
>>     
>
> http://forum.doom9.org/showthread.php?p=881381#post881381
> http://forum.doom9.org/showthread.php?p=881706#post881706
>
>   
>> 2. From revision 607, you deployed multithread based on frame. It means
>> that frame can no longer be devided into more slices (I cannot find any
>> parameters for setting the size of slice)?
>>     
>
> It means that if you were to divide a frame into slices, you could not
> use slice based threading at the same time as frame based threading. You
> could still encode multiple slices in one thread. But I didn't implement
> that because it's only for error resilience and not speed.
>
>   
>> With this method, you have to introduce the function
>> x264_frame_cond_wait to ensure the fact that in the current Frame B/P
>> encoded by thread X, before encoding a MB, all of its probable
>> reference MBs in other frames (therefore encoded by other threads)
>> must be encoded and reconstructed (then they can be used as
>> references). I still don't understand the reason you set 24 to
>> X264_THREAD_HEIGHT.
>>     
>
> commented.
>
> --Loren Merritt
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>   

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