[x264-devel] External motion vectors in x264

[Jason Garrett-Glaser]

On Tue, Nov 9, 2010 at 12:01 PM, Marco Munderloh
<munderl at tnt.uni-hannover.de> wrote:
>> Can you explain your particular use-case in more detail?
>> Additionally, how are you going to signal partition types and
>> macroblock modes?
>
> At the moment I just want to reuse some already calculated motion
> vectors from a preprocessor to reduce computing time. For the decision
> on what macroblock mode and partition to use I still want to use the RD
> optimizer of x264. To get motion vectors for every partition I'm
> thinking of smart interpolating them from the known motion vectors which
> are on a sub macroblock level.

What about reference frame indices?  Perhaps more importantly, what
about frame types?  You don't know before running x264 which frames
will be P and which will be B, so you can't possibly have computed the
motion vectors for the appropriate frametype combinations unless you
just computed all possible motion vector pairings.

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