rtspsrc, buffering using queue2 and issues

[Daniel Mellado]

Hi all.

I'm trying to set up a pipeline that reads data from a rtsp servers and uses
a queue2 element to perform buffering. However, I'm experiencing some issues
doing so. I'm using python bindings and gst.parse_launch to perform the
pipeline creation

My pipeline is as follows

self.player=gst.parse_launch('rtspsrc name=source source. ! queue2
name=queue ! rtph264depay ! decodebin2 ! autovideosink') //For the basic
test I'll just use video

Then I access the queue element using:

self.queue=self.player.get_by_name('queue')

I want to set the queue2 so it buffers 4 sec. of video, so I'm setting it
this way:

self.queue.props.max_size_time=4000000000 // It's supposed to be the time in
ns.
self.queue.props.max_size_bytes=0 // Left in auto mode
self.queue.props.max_size_buffers=0 // Left in auto mode, too

However, when playing the video, the queue never reaches that 4s. Instead, I
get the following stats.

2012-05-11 10:14:19,965 Buffer level:100%  data in the queue (ms.):1043ms.
Number of buffers 35 data in the queue (bytes) 38041

and so on. The time in the queue never reaches the max time I set up. At
first, I thought that it could be because time was evenly divided in the
number of buffers, but it doesn't seems so.

So, how can I really set the queue to buffer 4 seconds of video?.

I'd be really grateful if someone helps me with this matter.

Your sincerely.

Daniel Mellado 






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