[theora] recommendations for web video bit rates

Denver Gingerich denver at ossguy.com
Mon Mar 15 19:35:46 PDT 2010

On Mon, Mar 15, 2010 at 12:00 AM, Matthew Gregan <kinetik at flim.org> wrote:
> I couldn't remember what video I used back then, so I just re-ran the
> benchmark on my N900.  Using a copy Big Buck Bunny encoded at ~500kbps from
> the 640x360 lossless PNGs at media.xiph.org, testtheora (from theorarm 004)
> decodes 14315 frames in 132271ms, which averages 108 frames per second.  For
> reference, dump_video -f from the libtheora examples decodes the same video
> in 189320ms (76 fps), and using leonora with dump_video gives 187100ms/77
> fps (and CPU > 97% idle).

Thanks very much for those figures; they're very helpful.  Was it easy
to get theorarm compiled on the N900?  Does it require extra libraries
or is it fairly self-contained?

> Regarding the Layers stuff for Firefox, I think we'll have something
> sufficient to allow fullscreen OpenGL accelerated video playback (with
> colour conversion and scaling offloaded to the GPU) on the N900 in the next
> couple of months or so.  Based on early testing with a standalone program
> using the same decode/display strategy, we should be able to play back
> 800x480 (i.e. native resolution) videos at 24 fps and still have 50-60% idle
> CPU (of which 10-15% is PulseAudio).

That's very exciting to hear.  I'm looking forward to running
full-screen Theora in Firefox Mobile.


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