[theora-dev] Theora streaming

Ralph Giles giles at xiph.org
Thu Feb 27 17:33:23 PST 2003

On Thursday, February 27, 2003, at 06:21 pm, Arc wrote:

> Here's the question, however.  I asked this before, actually.. what
> happens when those segments are different resolutions or framerates?  
> Is
> this being considered in players and what would be an intelligent way
> for them to cope with a changing frame size, especially when outputting
> to an external video device (ie, full screen to NTSC/PAL tape)?

This is really up to the player. A simple gui player would probably 
just resize the window and of course doesn't much care what the 
framerate is. For fullscreen playback or spooling to tape for broadcast 
you'd obviously want to scale/letterbox to fit and in the latter case 
do some kind of intelligent 'telecine' to adapt the framerate. VP3 does 
have an aspect ratio field (dan-is that pixel or frame aspect?) so just 
switching from pal to ntsc at equivalent resolutions shouldn't cause a 
size change.

It does sound like If you are putting together this sort of thing it 
would provide useful 'realworld' test streams for player implementors.


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