Change resolution /framerate on the fly gstreamer pipeline

Autonomous Machines Jetson & Embedded Systems Jetson Nano
,
1

Hello,

I have write a pipeline in c++ that connects to camera and write image. I want to update resolution and framerate during pipeline in running state.

gst-launch-1.0 nvarguscamerasrc sensor-id=1 sensor-mode=3 \
! 'video/x-raw(memory:NVMM), width=3840, height=2160, format=(string)NV12, framerate=(fraction)30/1' \
! nvvidconv  ! nvjpegenc  ! multifilesink location=test%d.jpg

I tried to add filter object, between src and nvvidconv but it gave an error.

caps = gst_caps_from_string(“video/x-raw(memory:NVMM) , width=1920, height=1080, format=(string)NV12, framerate=(fraction)10/1”);
g_object_set(G_OBJECT(filter), “caps”, caps, NULL);
gst_caps_unref(caps);

Error generated. /dvs/git/dirty/git-master_linux/multimedia/nvgstreamer/gst-nvarguscamera/gstnvarguscamerasrc.cpp, execute:543

I have also tried to stop pipeline with this command.
gst_element_send_event(pipeline, gst_event_new_eos())
then succesfult restart same pipeline with new framerate value but when I tried to update frame rate again, this time it didn’t stopped.

What is the proper way of updating frame rate and width height values?
By the way, I can update all nvarguscamerasrc parameters on the fly without any problem.

2

caps Set the filter properties and select the appropriate stream. Changing the width, height and frame rate requires plugins with writable properties, such as videoconvert, videoscale, and videorate.

3

Thank you for your response @guo.chsh. I changed nvvidconv to videoconvert according to your mention.

This is the way I linked the source and videoconvert.
gst_element_link_many(source, capsfilter, videoconvert,NULL)

After running the pipeline I update the fps value with this.
configuration->fps = fps; caps = gst_caps_new_simple("video/x-raw",
   "format", G_TYPE_STRING, "NV12",      "framerate", GST_TYPE_FRACTION, configuration->fps, 1,
   "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
   "width", G_TYPE_INT, configuration->width,
   "height", G_TYPE_INT, configuration->height,
    NULL);

auto feature = gst_caps_features_new("memory:NVMM", NULL);
gst_caps_set_features(caps, 0, feature);    g_object_set(G_OBJECT(capsfilter), "caps", caps, NULL);

it again gave the same error like in nvvidconv
Error generated. /dvs/git/dirty/git-master_linux/multimedia/nvgstreamer/gst-nvarguscamera/gstnvarguscamerasrc.cpp, execute:543 Failed to create CaptureSession

I also tried to add another caps to the rightside of videoconvert and try to update it ,
gst_element_link_many(videoconvert,capsfilter2, tee, NULL)
then it gave this error
ERROR from element argus-source: Internal data stream error.
Error details: gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:test-pipeline/GstNvArgusCameraSrc:argus-source:
streaming stopped, reason not-negotiated (-4)

5

Hi,
It is not possible to change the resolution of source in runtime. You would need to terminate and reinitialize the pipeline.