[x264-devel] Re: AW: Re: Slices in x264

[Jeff Clagg]

On Wed, Jan 17, 2007 at 01:40:39PM +0000, Ryan Dalzell wrote:

> Errors do get smeared over slice boundaries in subsequence pictures that use 
> the error picture for reference. There is no clause that states that motion 
> vectors cannot cross slice boundaries in the picture that they are 
> referencing. So to force update using an intra slice in any picture after 
> the next one in decoding order you need to determine how much the error 
> could have travelled. This gets quite complicated I would imagine.

The problem isn't as bad as you make it out - in practice it often works
very well to do MC from the previous, good frame, and I've seen at least
one cheap hardware decoder that did something roughly like this. It was
simple and it looked surprisingly good.

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