[Libva] Quality of the scaled H264 decoded image

[Xiang, Haihao]

On Fri, 2013-02-15 at 16:18 -0800, Ratin wrote: 
> I am decoding a 720 P video stream from a camera to 1080 P surfaces
> and displaying them on the screen. I am seeing noticable noise and
> pulsating which is directly related to the I frame interval
> (aparently), the lowest I-frame interval I can specify for the camera
> is  1 second and selecting that in addition to bitrate of 8192 kbps
> makes is slightly better but still a lot of noise. A software
> decoded/scaled video looks all smooth.  
> 
> 
> What I am wondering is what's the default scaling algorithm being used
> in vaapi/intel driver and how do I specify better scaling algorithms
> like bi-cubic etc.and possibly specify the strength of deblocking
> filter level as well, and what can I do to reduce the pulsating ?  

Which driver are you using ? For Intel, it is bilinear.

>     
> 
> 
> 
> Any input would be much appreciated. 
> 
> 
> Thanks
> 
> 
> Ratin 
> 
> 
> _______________________________________________
> Libva mailing list
> Libva at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/libva