[theora] recommendations for web video bit rates

Denver Gingerich denver at ossguy.com
Sat Mar 13 21:23:11 PST 2010

On Sun, Mar 14, 2010 at 12:04 AM, Christopher Blizzard
<blizzard at mozilla.com> wrote:
> On 03/13/2010 01:58 PM, Gregory Maxwell wrote:
>> If you're using a properly optimized build anything reasonable which
>> will fit on the screen should play without problems, if you're not
>> then it won't perform acceptably regardless of what settings are used.
>>  I'm guessing that you're not using theorarm on the n900 right now, so
>> measurements on that won't be useful. (The numbers I've heard for
>> theorarm are hitting into the realm of 100fps with normal videos).
> Yeah, I'm not worried about the mobile use case right now.  We don't play
> reasonable sized videos yet and we won't until we're using something that
> has optimized-for-arm decoding and we've also got the problems in our
> rendering pipeline straightened out.

That's fair.

I just tried out a couple Theora videos in Firefox on my N900 and a
320x240 video seems to run at about 10fps or so (just eyeballing) with
no audio jitter, while a 720x540 and 854x480 video both run at about
1fps with very intermittent audio.  The 320x240 video does seem to be
bottlenecked at the CPU (it's not running at full fps) given top's

So if you make the resolution low enough, it's decent, but I guess it
might not be good enough for consideration in this Wikipedia project.
I'll leave that up to you.

The 100fps figure for theorarm that Gregory mentioned seems to be
coming from here:


I'd be interested to know where this came from.  Has someone got
theorarm to compile and run on the N900?  If so, I'd like to try it


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