#10137 NORM Not Tri: XO-1.5 camera FPS limit inaccurate?

[Zarro Boogs per Child]

#10137: XO-1.5 camera FPS limit inaccurate?
--------------------+-------------------------------------------------------
 Reporter:  dsd     |                 Owner:  corbet       
     Type:  defect  |                Status:  new          
 Priority:  normal  |             Milestone:  Not Triaged  
Component:  kernel  |               Version:  not specified
 Keywords:          |           Next_action:  never set    
 Verified:  0       |   Deployment_affected:               
Blockedby:          |              Blocking:               
--------------------+-------------------------------------------------------
 Not 100% sure on this yet, will add details as I progress, but I think
 I've identified a possible source of our synchronization issues:

 When you ask the camera for 10fps, I think it gives you (significantly)
 more than 10fps. (at least to the eye it seems remarkably smooth, and
 compared to playing a small video through gst's videorate filter, it feels
 like more than 10fps)

 If you set 10fps directly on the v4l2src (not using videorate) and record
 a video to a file, when playing back the file the video plays back
 slooowwllyy. I think this is because it is being played back at 10fps.

 In other words, I think gstreamer uses the reported FPS value from the
 camera for timing purposes. And I think we might have an inaccuracy.

-- 
Ticket URL: <http://dev.laptop.org/ticket/10137>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system