[x264-devel] motion estimation

[Oleg Terner]

We just want to get the mv of each mb as compared to the previous frame.

To make this simple, we took just 2 frames.
We see that the first frame is encoded as an I-frame, the second as a 
P-frame.
However, the mv we got are sometimes very strange.

The question is therefore as follows:

How can we force the me routine to check mv only against the previous 
frame. and if so, where do we get these values from.

Thanks
Oleg





Loren Merritt wrote:
> On Mon, 29 Sep 2008, Oleg Terner wrote:
>
>   
>> Is it possible to make use of the motion estimation part of the x264?
>>     
>
> Of course it's possible. x264 uses the the motion estimation part of x264. 
> If you really meant "Is it possible to abuse the motion estimation part of 
> x264 for something other than encoding h264", then you'll have to specify 
> more precisely what you want.
>
>   
>> We have looked at the h->mb.mv  values just after the call to
>>     x264_macroblock_analyse( h );
>> in the routine  x264_slice_write( x264_t *h ) in the file encoder.c.
>> Sometimes this gives the correct values, and sometimes not.
>>     
>
> Are you looking at the mv of an intra block, or an unused direction in 
> bidir? Fail.
>
> Are you complaining that an encoder's motion estimation only minimizes 
> block-wise residual, and doesn't find real motion of objects in the scene? 
> Yes, motion estimation for vision is harder than motion estimation for 
> compression.
>
> --Loren Merritt
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