[FFmpeg-devel] [PATCH] lowres=3 support in mpegvideo decoder

[Anatoliy Nenashev]

Michael Niedermayer wrote:
> On Fri, Jan 15, 2010 at 09:16:43PM +0300, Anatoliy Nenashev wrote:
>   
>> Hi!
>> Here goes a patch for lowres=3 support in MPEG video decoder.
>>     
>
> does this have some practical use?
>
>
>   
Yes! It may be used in fast video search.  The  quality of video may be 
ugly for  a  human  but  is good  for  correlation  functions.  Also the 
quality of I-frames is  pretty good.

>>      const int lowres= s->avctx->lowres;
>> +    const int op_index = (lowres < 3) ? lowres : 2;
>>     
>
> FFMIN
>
>   
Done
>   
>> +    sx = ( sx << (3 - lowres) ) >> 1;
>>     
> that can be done simpler
>
>   
New version is in applied patch.

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