mxc_v4l_dqueue timeout enc_counter 0

[Michael Yarochkin]

Hi


In my app, i am not doing any of unref at all. GStreamer is taking care about it.

Recreating all elements every time i need to play something Even for the same file.


And once you are unref element, which should be cleaned up in another place, you can cause memory access exception.


Because you are talking about frames from the past, it can be you are reusing the same elements in your new pipeline.


Do you want me to send you my library?


Mikl

________________________________
From: gstreamer-devel <gstreamer-devel-bounces at lists.freedesktop.org> on behalf of 张若 <zr92zr at gmail.com>
Sent: Thursday, November 17, 2016 5:39:54 PM
To: Discussion of the development of and with GStreamer
Subject: Re: mxc_v4l_dqueue timeout enc_counter 0

I once tried not to unref the pipeline. However, when I want to play that pipeline again later, there will be a large switch latency and delay, also many previous frames displayed at the beginning. I don't know why and how to deal with that. Therefore, I just unref pipeline and build the full pipeline and elements inside again.

2016-11-17 11:23 GMT+01:00 Michael Yarochkin <michael.yarochkin at timetronics.be<mailto:michael.yarochkin at timetronics.be>>:
Hello

Do you really need to do unref on pipeline?

Mikl
________________________________
From: gstreamer-devel <gstreamer-devel-bounces at lists.freedesktop.org<mailto:gstreamer-devel-bounces at lists.freedesktop.org>> on behalf of 张若 <zr92zr at gmail.com<mailto:zr92zr at gmail.com>>
Sent: Tuesday, November 15, 2016 3:45:16 PM
To: Discussion of the development of and with GStreamer
Subject: mxc_v4l_dqueue timeout enc_counter 0

Hi,

I got a problem while setting the pipeline state to NULL and unref that pipeline.

In my code, I need to stop two pipelines (imxv4l2src are two cameras) and start two new pipelines. While stopping current pipelines, I use:
gst_element_set_state (pipeline1, GST_STATE_NULL);
gst_object_unref (pipeline1);
gst_element_set_state (pipeline2, GST_STATE_NULL);
gst_object_unref (pipeline2);

Sometimes, when it runs here, the program will stuck for a while and show an error or 2 errors (because of 2 cameras) as:
ERROR: v4l2 capture: mxc_v4l_dqueue timeout enc_counter 0

It is strange to me because it doesn't occur every time when it runs here. And although this problem occurs, finally those two old pipelines can be removed and new pipelines can run correctly. The only problem is that it will stuck for a while when errors happen.

Is it the problem with the cameras themselves?

Thanks in advance!

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