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

[Wim Taymans]

On 05/11/2012 10:30 AM, Daniel Mellado wrote:

> 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?.

You can't. Instead, remove queue2 and set the latency on rtspsrc to 4
seconds.

Wim

>
> I'd be really grateful if someone helps me with this matter.
>
> Your sincerely.
>
> Daniel Mellado
>
>
>
>
>
>
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/rtspsrc-buffering-using-queue2-and-issues-tp4625837.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> _______________________________________________
> gstreamer-devel mailing list
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[Daniel Mellado]

And there is some way to adjust high and low thresholds, like in queue2, using just the latency property in rtspsrc? I tried that way, too, and it works, but I'd like to adjunts high/low thresholds too.

Many thanks