[theora] ffmpeg2theora and blocking artifacts

[Kevin Kammer]

The video quality of libtheora 1.1 is indeed a vast improvement over  
the older encoder. However, it seems that regardless of what options I  
pass to ffmpeg2theora, I am still getting significant blocks in the  
output. I have tried a range of quality settings, --pp deblock filter  
settings ranging from default to ha:255:1/va, etc. Nothing I do seems  
to alleviate the blocking.

Is this an inherent issue, or is there a way around it? The really  
disappointing part of all this is that otherwise the detail and  
picture quality of 1.1 are so good, that the blocking really seems to  
be marring an otherwise excellent encode.