[XviD-users] B-Frames & Trellis, and more...

[Lee Morgan]

Hi I'm using XviD (via mencoder).

These are my current xvid options...
max_key_interval=720:max_bframes=4:qpel:gmc:quant_type=mpeg:chroma_me:ch 
roma_opt:hq_ac:vhq=4:bvhq=1:fixed_quant=2

Which I must say, generates a very high quality video (higher than I  
could get from x264 - and believe me I tried) and at (what I  
consider) a very small file size; roughly 500MB for a 45 min video.

However I have a couple of questions...
(Note: Below, "gain", "help", etc all refer to either increasing  
quality or decreasing file size while keeping the same quality).

1) I read that only 2 b-frames are recommended, I suppose this is  
because of high motion scenes - due to XviD not having adaptive B- 
frames?

2) If I'm using vhq=4 should / do I gain anything from also using  
trellis?

3) Would using lumi_mask help any?

4) How about altering bf_threshold?


I realize that the best way to know is to encode some videos myself;  
however I'm just trying to get pointed in the "right" direction.

Thanks,
Lee
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