V4l2 streaming issue with high resolution on VIM3

176gauravsharma · July 3, 2025, 4:36am

Which system do you use? Android, Ubuntu, OOWOW or others?

Khadas VIM3 4GB

Which version of system do you use? Please provide the version of the system here:

kernel : 5.15
Ubuntu : 22.04
Python : 3.10.12

Please describe your issue below:

I’m creating V4L2 Pipeline through python script for accessing IP camera through its RTSP link.
everything working fine when camera is on low resolution ie. 1280x720. When i switch camera resolution to 2688x1520 stream is lagging.Is there any solution for this issue.I want smooth streaming with detections through model over it.

@Louis-Cheng-Liu eagerly waiting for your reply

Louis-Cheng-Liu · July 4, 2025, 7:58am

Hello @176gauravsharma ,

Have you used link by wifi? Suggest you using a faster more stable connection method like notwork inferface.

176gauravsharma · July 4, 2025, 10:03am

@Louis-Cheng-Liu the task which im performing required board and camera on LAN network and i’m doing the same.

Louis-Cheng-Liu · July 4, 2025, 10:28am

Hello @176gauravsharma ,

Will the screen struck? Only delayed?

176gauravsharma · July 4, 2025, 10:32am

its lagging only delayed

Louis-Cheng-Liu · July 7, 2025, 2:38am

Hello @176gauravsharma ,

Could you provide the the way of reproduction?

176gauravsharma · July 11, 2025, 10:37am

create device: /dev/video40
gst_cmd = f"gst-launch-1.0 -v rtspsrc location="{stream_url}" latency=0 ! "
f"rtph264depay ! h264parse ! avdec_h264 ! videoconvert ! videoscale ! "
f"video/x-raw,width=640,height=360 ! v4l2sink device={video_device}"
provide rtsp link at stream_url place
@Louis-Cheng-Liu

numbqq · July 14, 2025, 1:44am

You use the software decoding plugin so it will reduce the performance, could you try to use the hardware decoding plugin?

176gauravsharma · July 14, 2025, 11:37am

pipeline used on VIM3 4GB kernel : 5.15 Ubuntu : 22.04:
f’gst-launch-1.0 rtspsrc location=“{stream_url}” protocols=udp latency=100 ! ’
f"rtph264depay ! h264parse ! amlv4l2h264dec ! videoconvert ! "
f"videoscale ! video/x-raw,format=YUY2 ! v4l2sink device={video_device}"

logs given in image please refer @Louis-Cheng-Liu

numbqq · July 14, 2025, 11:40am

Please use v4l2h264dec.

176gauravsharma · July 14, 2025, 11:54am

Pipeline used:
f’gst-launch-1.0 rtspsrc location=“{stream_url}” protocols=udp latency=100 ! ’
f"rtph264depay ! h264parse ! v4l2h264dec ! videoconvert ! "
f"videoscale ! video/x-raw,format=YUY2 ! v4l2sink device={video_device}"

for log view screenshot below