Internal streaming error during appsrc example

[bossebandowski]

Hey,

thanks for this great work. I want to use it in an app to push frames to a pipeline after some computer vision magic. However, when running the appsrc example, I encounter the following error:

bob@nano5:~/gstreamer-python$ PYTHONPATH=. python examples/run_appsrc.py -p "appsrc emit-signals=True is-live=True caps=video/x-raw,format=RGB,width=640,height=480 ! queue ! videoconvert ! autovideosink"  -n 1000

INFO   | pygst.GstPipeline    | 13.08 12:22:31.595 | MainThread | GstPipeline 
 gst-launch-1.0 appsrc emit-signals=True is-live=True caps=video/x-raw,format=RGB,width=640,height=480 ! queue ! videoconvert ! autovideosink

INFO   | pygst.GstPipeline    | 13.08 12:22:31.672 | MainThread | Starting GstPipeline

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.674 | MainThread | GstPipeline Setting pipeline state to PLAYING ... 

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.675 | MainThread | GstPipeline Pipeline state set to PLAYING 

ERROR  | pygst.GstPipeline    | 13.08 12:22:31.695 | Thread-1 | Gstreamer.GstPipeline: Error gst-stream-error-quark: 
Internal data stream error. (1): gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:pipeline0/GstAppSrc:appsrc0:
streaming stopped, reason not-negotiated (-4). 

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.696 | Thread-1 | GstPipeline Stopping pipeline ...

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.697 | Thread-1 | GstPipeline Reseting pipeline state ....

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.698 | Thread-1 | GstPipeline Gst.Pipeline successfully destroyed

INFO   | pygst.GstPipeline    | 13.08 12:22:38.935 | MainThread | GstPipeline Shutdown requested ...

INFO   | pygst.GstPipeline    | 13.08 12:22:38.935 | MainThread | GstPipeline successfully destroyed

DEBUG  | pygst.GstContext     | 13.08 12:22:38.935 | MainThread | GstContext Quitting main loop ...

DEBUG  | pygst.GstContext     | 13.08 12:22:38.937 | MainThread | GstContext Joining main loop thread...

platform: Jetson nano with jetpack 4.5.1
python: 3.6.9
gstreamer: 1.14.5

Any idea what might be the reason?
Cheers

[jackersson]

Hey,

If I'm correct on Jetson Nano default videosink is nveglglessink. nveglglessink accepts buffers in 'video/x-raw(memory:NVMM) format instead of video/x-raw. That's why caps are not negotiated.

Instead of videoconvert you might use nvvidconv. It converts x-raw to x-raw(memory:NVMM). But also when RGB is not supported when we use hardware acceleration on Jetson. Use RGBA instead (or other 4-channels format).

Hope this helps :) Good luck!

[bossebandowski]

Thanks for the answer, could still not get it to work. The sink does not seem to be the problem because it does not work with fakesink either. Tried RGBA with no success. I might come back to visit this in due time, will leave to issue open for now.