Inconsistent response json structure for element_get about gstd-1.x

[tinChe-]

@lleon95
Actually, I have tested master and develop branches. It behaves the same on both.

[lleon95]

Can you test this fix?

feature/fix-write-only-property-messages

[lleon95]

Hi @tinChe-

Thanks for your detailed report. Could you tell us which branch you are using?

Currently, I am integrating a change to fix a similar issue: #312

I think with the PR comments, this may be fixed. I will tell you as soon as I get it

BR,
Leon

[tinChe-]

@lleon95
I can confirm that using feature/fix-write-only-property-messages branch resolve this issue

[tinChe-]

This is probably unrelated but using the same pipeline and reading the element v4l2src0 extra-controls outputs the error on GstD:
(gstd:13182): GStreamer-CRITICAL **: 09:06:58.312: gst_structure_to_string: assertion 'structure != NULL' failed

To reproduce:

gstd-client pipeline_create camera_stream v4l2src device=/dev/video0 ! image/jpeg,width=1920,height=1080,framerate=60/1,format=MJPG ! nvv4l2decoder mjpeg=1 ! nvvidconv ! nvv4l2h264enc bitrate=16000000 insert-sps-pps=true idrinterval=30 enable-lossless=true ! video/x-h264, mapping=/stream1 ! rtspsink service=12345
gstd-client element_get camera_stream v4l2src0 extra-controls

[lleon95]

This is probably unrelated but using the same pipeline and reading the element v4l2src0 extra-controls outputs the error on GstD: (gstd:13182): GStreamer-CRITICAL **: 09:06:58.312: gst_structure_to_string: assertion 'structure != NULL' failed

To reproduce:

gstd-client pipeline_create camera_stream v4l2src device=/dev/video0 ! image/jpeg,width=1920,height=1080,framerate=60/1,format=MJPG ! nvv4l2decoder mjpeg=1 ! nvvidconv ! nvv4l2h264enc bitrate=16000000 insert-sps-pps=true idrinterval=30 enable-lossless=true ! video/x-h264, mapping=/stream1 ! rtspsink service=12345
gstd-client element_get camera_stream v4l2src0 extra-controls

Is this the only message that appears? It happens when the property returns an empty structure.

[tinChe-]

Yes, this is the only message output from the gstd, and it is outputted every time the element is queried.
I get the same behavior when querying extra-controls from other elements for example nvv4l2decoder0

Another thing that I noticed is when querying last-sample from example gstinterpipe or rtspsink I get 4 lines

(gstd:13704): GStreamer-CRITICAL **: 08:07:52.407: gst_sample_get_buffer: assertion 'GST_IS_SAMPLE (sample)' failed
(gstd:13704): GStreamer-CRITICAL **: 08:07:52.407: gst_sample_get_caps: assertion 'GST_IS_SAMPLE (sample)' failed
(gstd:13704): GStreamer-CRITICAL **: 08:07:52.407: gst_sample_get_segment: assertion 'GST_IS_SAMPLE (sample)' failed
(gstd:13704): GStreamer-CRITICAL **: 08:07:52.407: gst_sample_get_info: assertion 'GST_IS_SAMPLE (sample)' failed

If I query nvv4l2decoder0 device-name I get one line that opens something

Opening in BLOCKING MODE