[MPlayer-cvslog] CVS: main/libmpcodecs ve_lavc.c,1.121,1.122

[The Wanderer]

On 12/27/2005 06:59 PM, Corey Hickey wrote:

> Michael Niedermayer wrote:
> 
>> ok, there are different macroblock types in b frames,
>> 1. forward predicted ones, they use the previous non B frame
>> 2. backward predicted ones, they use the next non B frame
>> 3. bidirectional ones, they use 2 vectors, one pointing to the
>>    previous frame  one to the next
>> 4. direct ones, they are like 3. except that they store only one 
>>    vector and calculate the second one from the colocated vector in
>>    the next non B frame
>> (this is what mpeg4 supports, other standards are very similar)
>> 
>> now 1. 2. and 4. are the same from a motion estimation point of
>> view, just find the best single vector using your favorite ME
>> algorithm for P frames 3. has 2 vectors, previously we simply used
>> the vectors from the forward and backward searches without refining
>> them, now bidir_refine does a simple 4-dimensional diamond like
>> search with the number affecting the shape of the used diamond,
>> (larger number is slower)
> 
> Thanks for the explanation. I think that makes sense to me. Would the
> following be appropriate for the man page?
> 
> bidir_refine=<0-4>
>     Refine the two motion vectors used in biderectional macroblocks,

Typo - "bidirectional"

-- 
       The Wanderer

Warning: Simply because I argue an issue does not mean I agree with any
side of it.

Secrecy is the beginning of tyranny.