Why does appsink fall behind?

[Ben Rush]

This whole question refers to code I've put up on GitHub here. The project containing this file is a Visual Studio project, but it should be easily buildable under Linux as well as there isn't much to the source. 

My problem is this: I'm trying to pull RTSP stream data from a camera and do some simple OpenCV manipulation. This dummy app I put together for this email just blurs. Simple stuff. The problem is that the pipeline continues to fall farther and farther behind.  The best I can reason, it has to do with the appsink element. But I'm explicitly telling it to have a buffer length of 1, to drop buffers, etc. I've also set the rtspsrc to have zero latency, to drop on latency, etc. too. 

Any thoughts on what I could be doing wrong? I've fiddled with several parameters to no avail, over time it just accumulates delay. 

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[Ben Rush]

I didn't get any responses, but I figured out my own problem. So, rather than just let this die, hopefully, I can answer for posterity's sake. 

Basically: put a length-one queue after the decoder. Rather than repeat what has been said before, refer to this thread:  http://gstreamer-devel.966125.n4.nabble.com/Drop-frames-if-a-filter-neural-networks-is-too-slow-td4687932.html. 

On Wed, Jun 19, 2019 at 1:42 PM Ben Rush <[hidden email]> wrote:

This whole question refers to code I've put up on GitHub here. The project containing this file is a Visual Studio project, but it should be easily buildable under Linux as well as there isn't much to the source. 

My problem is this: I'm trying to pull RTSP stream data from a camera and do some simple OpenCV manipulation. This dummy app I put together for this email just blurs. Simple stuff. The problem is that the pipeline continues to fall farther and farther behind.  The best I can reason, it has to do with the appsink element. But I'm explicitly telling it to have a buffer length of 1, to drop buffers, etc. I've also set the rtspsrc to have zero latency, to drop on latency, etc. too. 

Any thoughts on what I could be doing wrong? I've fiddled with several parameters to no avail, over time it just accumulates delay. 

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