Re: [Mjpeg-developer] Re: Custom quantization matrices initial results

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

Hi!
On Tuesday 29 July 2003 18:34, Alexei Dets wrote:
> Here are the results of new tests.

Now the continuation with SVCD presets.

480x480, -q 5, -f 4, default
==================================================================
   INFO: [mplex] VIDEO_STATISTICS: e0
   INFO: [mplex] Video Stream length:     1879471 bytes
   INFO: [mplex] Sequence headers:       82
   INFO: [mplex] Sequence ends   :        1
   INFO: [mplex] No. Pictures    :     1439
   INFO: [mplex] No. Groups      :       82
   INFO: [mplex] No. I Frames    :       82 avg. size 23570 bytes
   INFO: [mplex] No. P Frames    :      400 avg. size 11550 bytes
   INFO: [mplex] No. B Frames    :      957 avg. size  8873 bytes
   INFO: [mplex] No. D Frames    :        0 avg. size     0 bytes
   INFO: [mplex] Average bit-rate :  2004000 bits/sec
   INFO: [mplex] Peak bit-rate    :  2366000  bits/sec

480x480, -q 5, -f 4, tmpgenc
==================================================================
   INFO: [mplex] VIDEO_STATISTICS: e0
   INFO: [mplex] Video Stream length:     1498163 bytes
   INFO: [mplex] Sequence headers:       82
   INFO: [mplex] Sequence ends   :        1
   INFO: [mplex] No. Pictures    :     1439
   INFO: [mplex] No. Groups      :       82
   INFO: [mplex] No. I Frames    :       82 avg. size 23763 bytes
   INFO: [mplex] No. P Frames    :      400 avg. size  9053 bytes
   INFO: [mplex] No. B Frames    :      957 avg. size  6712 bytes
   INFO: [mplex] No. D Frames    :        0 avg. size     0 bytes
   INFO: [mplex] Average bit-rate :  1597600 bits/sec
   INFO: [mplex] Peak bit-rate    :  2180800  bits/sec

480x480, -q 5, -f 4, kvcd
==================================================================
   INFO: [mplex] VIDEO_STATISTICS: e0
   INFO: [mplex] Video Stream length:     1366181 bytes
   INFO: [mplex] Sequence headers:       82
   INFO: [mplex] Sequence ends   :        1
   INFO: [mplex] No. Pictures    :     1439
   INFO: [mplex] No. Groups      :       82
   INFO: [mplex] No. I Frames    :       82 avg. size 27969 bytes
   INFO: [mplex] No. P Frames    :      400 avg. size  7952 bytes
   INFO: [mplex] No. B Frames    :      957 avg. size  5707 bytes
   INFO: [mplex] No. D Frames    :        0 avg. size     0 bytes
   INFO: [mplex] Average bit-rate :  1456800 bits/sec
   INFO: [mplex] Peak bit-rate    :  2260000  bits/sec

480x480, -q 8, -f 4, default
==================================================================
   INFO: [mplex] VIDEO_STATISTICS: e0
   INFO: [mplex] Video Stream length:     1309929 bytes
   INFO: [mplex] Sequence headers:       82
   INFO: [mplex] Sequence ends   :        1
   INFO: [mplex] No. Pictures    :     1439
   INFO: [mplex] No. Groups      :       82
   INFO: [mplex] No. I Frames    :       82 avg. size 19796 bytes
   INFO: [mplex] No. P Frames    :      400 avg. size  7988 bytes
   INFO: [mplex] No. B Frames    :      957 avg. size  5922 bytes
   INFO: [mplex] No. D Frames    :        0 avg. size     0 bytes
   INFO: [mplex] Average bit-rate :  1396800 bits/sec
   INFO: [mplex] Peak bit-rate    :  1943600  bits/sec

480x480, -q 8, -f 4, tmpgenc
==================================================================
   INFO: [mplex] VIDEO_STATISTICS: e0
   INFO: [mplex] Video Stream length:     1051624 bytes
   INFO: [mplex] Sequence headers:       82
   INFO: [mplex] Sequence ends   :        1
   INFO: [mplex] No. Pictures    :     1439
   INFO: [mplex] No. Groups      :       82
   INFO: [mplex] No. I Frames    :       82 avg. size 19061 bytes
   INFO: [mplex] No. P Frames    :      400 avg. size  6121 bytes
   INFO: [mplex] No. B Frames    :      957 avg. size  4604 bytes
   INFO: [mplex] No. D Frames    :        0 avg. size     0 bytes
   INFO: [mplex] Average bit-rate :  1121200 bits/sec
   INFO: [mplex] Peak bit-rate    :  1737200  bits/sec

480x480, -q 8, -f 4, kvcd
==================================================================
   INFO: [mplex] VIDEO_STATISTICS: e0
   INFO: [mplex] Video Stream length:      965138 bytes
   INFO: [mplex] Sequence headers:       82
   INFO: [mplex] Sequence ends   :        1
   INFO: [mplex] No. Pictures    :     1439
   INFO: [mplex] No. Groups      :       82
   INFO: [mplex] No. I Frames    :       82 avg. size 21583 bytes
   INFO: [mplex] No. P Frames    :      400 avg. size  5329 bytes
   INFO: [mplex] No. B Frames    :      957 avg. size  3995 bytes
   INFO: [mplex] No. D Frames    :        0 avg. size     0 bytes
   INFO: [mplex] Average bit-rate :  1029200 bits/sec
   INFO: [mplex] Peak bit-rate    :  1828800  bits/sec

Here the maximum savings are also in case of -q5 + kvcd - 27% (and nearly the 
same in -q8 - 26%).

It is interesting that kvcd matrix lowers average bitrate a lot but doesn't 
affect peak bitrate too much (compared to tmpgenc - lowers average bitrate 
less but peak bitrate more). The same beahaviour with frame sizes - tmpgenc 
produces smaller sizes for all types of frames, kvcd - only for P & B, I 
becomes even bigger than default.

	Alexei