[theora-dev] optimization for OLPC

[salsaman]

Chih-Chung Chang wrote:

> Hi,
>
> Here is the number for encoding and decoding Theora on XO-B2.
> For comparison, the same test is run on Athlon-XP1800+.
>
> Encoding:
>
> sample         size      XO     Athlon  bitrate
> -------------- --------  ------ ------- ---------
> akiyo_cif      352x288   16 fps 131 fps 129 kbps
> akiyo_qcif     176x144   62 fps 483 fps 40 kbps
> coastguard_cif 352x288    4 fps  40 fps 863 kbps
> football_sif   352x240    2 fps  24 fps 1503 kbps
> foreman_cif    352x288    5 fps  44 fps 583 kbps
> foreman_qcif   176x144   21 fps 182 fps 176 kbps
>
> Decoding:
> sample               size         XO      Athlon
> -------------------- ---------  -------- --------
> 320x240              320x240     82 fps   705 fps
> 322x242_not-divisibl 336x256     69 fps   571 fps
> Building_On_The_Past 320x240     99 fps   666 fps
> Elephants_Dream_1024 1024x576     6 fps    41 fps
> Elephants_Dream_512- 512x288     27 fps   169 fps
> MSD_ORACLE.vlog_2    368x240    160 fps  1499 fps
> chained_streams      320x240     81 fps   705 fps
> monday_0930_Welcome  320x240    125 fps  1000 fps
> multi2               320x240     38 fps   499 fps
> pixel_aspect_ratio   352x288     32 fps   244 fps
> romalcc              352x288    133 fps  1000 fps
> timeskew1-t2s1       320x240     75 fps   599 fps
> videotestsrc-720x576 720x576     19 fps   148 fps
>
> The test uses dump_video and encoder_example in Theora
> examples. The output is directed to /dev/null. The video
> quality is set to 3 for encoding. The decoding runs for
> first 120 frames only. XO's wireless is off while testing.
>
> The encoding samples are from
> http://media.xiph.org/video/derf/
>
> The decoding samples are collected from the net:
> http://www.archive.org/download/Robert_M.Albrecht_Einfuehrung_in_CreativeCommons/romalcc.OGG 
>
> http://linux.dell.com/vlogs/MSD_ORACLE.vlog_2.ogg
> http://blogage.de/mirror/ogg/timeskew1-t2s1.ogg
> http://people.xiph.org/~giles/2006/Elephants_Dream_512-st.ogg
> http://people.xiph.org/~giles/2006/Elephants_Dream_1024.ogg
> http://share.sh.cvut.cz/avc/Theora_demos/Building_On_The_Past.small.ogg
> http://papaja.v2v.cc/~j/theora_testsuite/
> http://mirror.linux.org.au/linux.conf.au/2007/video/monday/monday_0930_Welcome.ogg 
>
>
> Regards,
> Chih-Chung Chang

Hi Chih-Chung,
were these results with or without mmx optimisations ?

The decoding results look fairly reasonable up to a frame size of about 
640x480.

There are some further test ogg files you can use at 
http://lives.rm.org/demos

Gabriel.
http://lives.sourceforge.net