[x264-devel] Re: multislice-encoding gone?

[Michael Roitzsch]

Hi,

>> do I read in commit r607 correctly that x264 can no longer encode  
>> with multiple slices per frame? If so, I think this is a loss,  
>> because multiple slices are a nice feature for parallel decoders.
>
> Multiple slices are gone.
> Which decoders use slices for parallelism? The parallel decoders I  
> know are CoreAVC and Nero, which don't depend on slices.

Interesting. Do you happen to know what coding feature they use for  
parallelism? Parallel decoding of multiple frames?

> Dunno how Apple's works.

Apple uses slices. The H.264 trailers you can download from apple.com  
have up to 9 slices per frame.

I would really appreciate if this feature could come back. I wouldn't  
mind if it was entirely orthogonal to the threading, because I don't  
need the slices for parallel encoding. I use them with a modified  
version of FFmpeg for research on parallel decoding. I also have  
patches here that enable x264 to use arbitrary macroblocks to start a  
new slice, not just the first in a row.

Michael

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