[FFmpeg-user] Quantizer Matrix

[J A Stephen Viggiano]

Sorry if this is answered somewhere; I checked the man page, all the 
online documentation I could, and this list back to the Big Scism of 
2011....

How do I get ffmpeg to use the MPEG quantizer? When use mediainfo to 
examine a video encoded using the xvid video coder (-vcodec libxvid) or 
the asp default (-acodec mpeg4), it tells me (among many other things) 
that the h.263 "matrix" was used; see below (sorry if this should go 
into pastebin instead).

Assuming the mediainfo tool is correct, is there any way to specify the 
quantization method, such as to employ the MPEG matrices?

Thank you!

================================
 > ffmpeg -i ed_hd.ogv -vcodec mpeg4 -qscale 4 -acodec copy -t 10 sample.avi
ffmpeg version 0.8.1, Copyright (c) 2000-2011 the FFmpeg developers
   built on Jul 28 2011 23:08:02 with gcc 4.5.0 20100604 [gcc-4_5-branch 
revision 160292]
   configuration: --shlibdir=/usr/lib --prefix=/usr 
--mandir=/usr/share/man --libdir=/usr/lib --enable-shared 
--disable-static --enable-libmp3lame --enable-libvorbis 
--enable-libtheora --enable-libspeex --enable-libxvid --enable-postproc 
--enable-gpl --enable-x11grab --extra-cflags='-fomit-frame-pointer 
-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector 
-funwind-tables -fasynchronous-unwind-tables -g -D_LARGEFILE_SOURCE 
-D_FILE_OFFSET_BITS=64 -I/usr/include/gsm' --enable-debug 
--disable-stripping --enable-libgsm --enable-libschroedinger 
--enable-libdirac --enable-avfilter --enable-libvpx --enable-version3 
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 
--enable-libdc1394 --enable-pthreads --enable-librtmp
   libavutil    51.  9. 1 / 51.  9. 1
   libavcodec   53.  7. 0 / 53.  7. 0
   libavformat  53.  4. 0 / 53.  4. 0
   libavdevice  53.  1. 1 / 53.  1. 1
   libavfilter   2. 23. 0 /  2. 23. 0
   libswscale    2.  0. 0 /  2.  0. 0
   libpostproc  51.  2. 0 / 51.  2. 0
[theora @ 0x807da60] 7 bits left in packet 82
Input #0, ogg, from 'ed_hd.ogv':
   Duration: 00:10:53.78, start: 0.000000, bitrate: 558 kb/s
     Stream #0.0: Video: theora, yuv420p, 544x304, 24 fps, 24 tbr, 24 
tbn, 24 tbc
     Stream #0.1: Audio: vorbis, 44100 Hz, stereo, s16
     Metadata:
       TITLE           : Elephants Dream
       ARTIST          : Bassam Kurdali
       LICENSE         : http://creativecommons.org/licenses/by/3.0/us/
       DATE            : 2006
       ORGANIZATION    : Orange Open Movie Project Studio
       LOCATION        : http://www.archive.org/details/ElephantsDream
[buffer @ 0x821c600] w:544 h:304 pixfmt:yuv420p tb:1/1000000 sar:0/1 
sws_param:
[theora @ 0x807da60] 7 bits left in packet 82
Output #0, avi, to 'sample.avi':
   Metadata:
     ISFT            : Lavf53.4.0
     Stream #0.0: Video: mpeg4, yuv420p, 544x304, q=2-31, 200 kb/s, 24 
tbn, 24 tbc
     Stream #0.1: Audio: libvorbis, 44100 Hz, stereo
     Metadata:
       TITLE           : Elephants Dream
       ARTIST          : Bassam Kurdali
       LICENSE         : http://creativecommons.org/licenses/by/3.0/us/
       DATE            : 2006
       ORGANIZATION    : Orange Open Movie Project Studio
       LOCATION        : http://www.archive.org/details/ElephantsDream
Stream mapping:
   Stream #0.0 -> #0.0
   Stream #0.1 -> #0.1
Press [q] to stop, [?] for help
frame=  240 fps=214 q=4.0 Lsize=     631kB time=00:00:10.00 bitrate= 
516.6kbits/s
video:552kB audio:39kB global headers:0kB muxing overhead 6.610288%

 > mediainfo --Inform='Video;%Format_Settings_Matrix/String%' sample.avi
Default (H.263)