How to detect dropped frames?

[Ralph]

I am displaying multiple videos simultaneously using gnonlin.  When I try to play 8 videos at x8 speed, the machine is not able to handle it and lots of friends are dropped, the videos are temporarily paused.  How can I detect such situations programmatically?  I need to know when I reached the limits of smooth playback.

[Wim Taymans]

On 11/14/2012 12:31 PM, Ralph wrote:
> I am displaying multiple videos simultaneously using gnonlin.  When I try to
> play 8 videos at x8 speed, the machine is not able to handle it and lots of
> friends are dropped, the videos are temporarily paused.  How can I detect
> such situations programmatically?  I need to know when I reached the limits
> of smooth playback.
You will receive QOS messages on the bus.
See also
http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/design/part-qos.txt

Wim

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[Tim-Philipp Müller-2]

On Wed, 2012-11-14 at 03:31 -0800, Ralph wrote:

> I am displaying multiple videos simultaneously using gnonlin.  When I try to
> play 8 videos at x8 speed, the machine is not able to handle it and lots of
> friends are dropped, the videos are temporarily paused.  How can I detect
> such situations programmatically?  I need to know when I reached the limits
> of smooth playback.

With recent versions of GStreamer (1.x) you should get QoS messages on
the pipeline bus when decoders or sinks drop frames. (Possibly also with
0.10 git, not sure about last 0.10 releases)

Cheers
 -Tim

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[Ralph]

Thank you for the quick response, it is exactly what I was looking for, but for some reason I wasn't able to find (it looks so obvious now...).
I'm using GStreamer 0.10 (to be precise: OSSBuild WinBuilds v0.10.7, Beta 04 with C# bindings).