[gst-devel] videomixer2 ?

[Ron McOuat]

  On 10-09-09 11:17 PM, Sebastian Dröge wrote:
> On Thu, 2010-09-09 at 15:46 -0700, Ron McOuat wrote:
>> Last time I looked queue2 is missing the feature that allows the queue
>> to maintain N seconds of buffer and then leak buffers as they pass that
>> N second age.
> You don't really want queue to leak buffers anyway. That's just a bad
> hack for broken QoS handling IMHO
My use has nothing to do with QoS, I am using queue in buffer leak mode 
to implement a pre-trigger buffer downstream of a live source. When an 
event occurs I have N sec of video from before the event stored in the 
queue so when I unblock the src pad I record the video buffers stored in 
the queue followed by the real time data from the live source until the 
event ends at which time I again block the src pad. I don't want any 
more than N sec worth of pre-trigger, just a short period of time up to 
10 seconds before the trigger point. If nothing interesting is happening 
possibly for hours the video can fall off the end of the queue. The 
queue element is perfect for this purpose.

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