[x264-devel] Test results of trellis,brdo,and mixed_refs

[Tuukka Toivonen]

I noticed that there were a bunch of new options in x264.
I made a quick testing of them, using the methods I think
I have described sometime: ie. fixed QP values at several
values, around 12 640x480 sequences, 250 frames or so.

The results are presented as percentage of the original
bitrate at the same quality (PSNR), smaller = better.

Looks like every one of the new options helps significantly. Great! In 
total by using all of the options, around 7% of bitrate reduction is 
obtained (at the same PSNR). Especially trellis makes nice impact.

I didn't put the EPS-graphs & timings online, but if someone really wants 
them I can provide those too.

Exact options and results are below (for mencoder):

x264best2: baseline
"$OPTS:nomixed_refs:nobrdo:trellis=0:frameref=15:nob_adapt:b_bias=0:bframes=3:b_pyramid:ip_factor=1.0:pb_factor=1.5:direct_pred=1:noweight_b:i4x4:i8x8:b8x8mv:8x8mv:no4x4mv:8x8dct:me=3:me_range=24:subq=6:nochroma_me:chroma_qp_offset=8"

x264best2mr: mixed references
"$OPTS:mixed_refs:nobrdo:trellis=0:frameref=15:nob_adapt:b_bias=0:bframes=3:b_pyramid:ip_factor=1.0:pb_factor=1.5:direct_pred=1:noweight_b:i4x4:i8x8:b8x8mv:8x8mv:no4x4mv:8x8dct:me=3:me_range=24:subq=6:nochroma_me:chroma_qp_offset=8"

x264best2brd: brdo (B-frame MB-type RD-optimization)
"$OPTS:nomixed_refs:brdo:trellis=0:frameref=15:nob_adapt:b_bias=0:bframes=3:b_pyramid:ip_factor=1.0:pb_factor=1.5:direct_pred=1:noweight_b:i4x4:i8x8:b8x8mv:8x8mv:no4x4mv:8x8dct:me=3:me_range=24:subq=6:nochroma_me:chroma_qp_offset=8"

x264best2tr1: trellis=1
"$OPTS:nomixed_refs:nobrdo:trellis=1:frameref=15:nob_adapt:b_bias=0:bframes=3:b_pyramid:ip_factor=1.0:pb_factor=1.5:direct_pred=1:noweight_b:i4x4:i8x8:b8x8mv:8x8mv:no4x4mv:8x8dct:me=3:me_range=24:subq=6:nochroma_me:chroma_qp_offset=8"

x264best2tr2: trellis=2
"$OPTS:nomixed_refs:nobrdo:trellis=2:frameref=15:nob_adapt:b_bias=0:bframes=3:b_pyramid:ip_factor=1.0:pb_factor=1.5:direct_pred=1:noweight_b:i4x4:i8x8:b8x8mv:8x8mv:no4x4mv:8x8dct:me=3:me_range=24:subq=6:nochroma_me:chroma_qp_offset=8"

x264best2mrbrdtr2: all new options enabled
"$OPTS:mixed_refs:brdo:trellis=2:frameref=15:nob_adapt:b_bias=0:bframes=3:b_pyramid:ip_factor=1.0:pb_factor=1.5:direct_pred=1:noweight_b:i4x4:i8x8:b8x8mv:8x8mv:no4x4mv:8x8dct:me=3:me_range=24:subq=6:nochroma_me:chroma_qp_offset=8"


x264best2 any    bitrate, psnr 35.67 .. 39.65         size(%): 100.00000
x264best2mrbrdtr2 any    bitrate, psnr 35.67 .. 39.65 size(%): 93.25947
x264best2tr2 any    bitrate, psnr 35.67 .. 39.65      size(%): 95.91047
x264best2tr1 any    bitrate, psnr 35.67 .. 39.65      size(%): 96.75212
x264best2brd any    bitrate, psnr 35.67 .. 39.65      size(%): 98.34967
x264best2mr any    bitrate, psnr 35.67 .. 39.65       size(%): 98.97902

x264best2 high   bitrate, psnr 38.33 .. 39.65         size(%): 100.00000
x264best2mrbrdtr2 high   bitrate, psnr 38.33 .. 39.65 size(%): 92.07864
x264best2tr2 high   bitrate, psnr 38.33 .. 39.65      size(%): 95.19136
x264best2tr1 high   bitrate, psnr 38.33 .. 39.65      size(%): 96.15733
x264best2brd high   bitrate, psnr 38.33 .. 39.65      size(%): 97.69110
x264best2mr high   bitrate, psnr 38.33 .. 39.65       size(%): 99.08449

x264best2 low    bitrate, psnr 35.67 .. 37.00         size(%): 100.00000
x264best2mrbrdtr2 low    bitrate, psnr 35.67 .. 37.00 size(%): 94.42675
x264best2tr2 low    bitrate, psnr 35.67 .. 37.00      size(%): 96.62986
x264best2tr1 low    bitrate, psnr 35.67 .. 37.00      size(%): 97.40664
x264best2mr low    bitrate, psnr 35.67 .. 37.00       size(%): 98.88937
x264best2brd low    bitrate, psnr 35.67 .. 37.00      size(%): 99.05624

x264best2 medium bitrate, psnr 37.00 .. 38.33         size(%): 100.00000
x264best2mrbrdtr2 medium bitrate, psnr 37.00 .. 38.33 size(%): 93.27302
x264best2tr2 medium bitrate, psnr 37.00 .. 38.33      size(%): 95.91018
x264best2tr1 medium bitrate, psnr 37.00 .. 38.33      size(%): 96.69239
x264best2brd medium bitrate, psnr 37.00 .. 38.33      size(%): 98.30168
x264best2mr medium bitrate, psnr 37.00 .. 38.33       size(%): 98.96319

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