Gstreamer 管道仅适用于 sudo

Question

I am running the following Gstreamer pipeline on a headless Ubuntu 20.04 LTS:

gst-launch-1.0 v4l2src ! video/x-raw,width=640,height=480,framerate=30/1 ! vpuenc_h264 bitrate=500 ! avimux ! filesink location='vid.avi'

When I use sudo before it, the camera starts recording the video successfully. However, without `sudo, I get the following error:

====== VPUENC: 4.5.5 build on Aug  4 2020 21:46:19. ======
    wrapper: 3.0.0 (VPUWRAPPER_ARM64_LINUX Build on Aug  4 2020 21:45:37)
    vpulib: 1.1.1
    firmware: 1.1.1.43690
0:00:00.054172250  1474 0xaaaac8897000               default gstallocatorphymem.c:149:base_alloc: Allocate phymem 4194320 failed.

0:00:00.054212750  1474 0xaaaac8897000               default gstvpu.c:90:gst_vpu_allocate_internal_mem: Could not allocate memory using VPU allocator
0:00:00.054236000  1474 0xaaaac8897000                vpuenc gstvpuenc.c:543:gst_vpu_enc_start:<vpuenc_h264-0> gst_vpu_allocate_internal_mem fail
0:00:00.054260875  1474 0xaaaac8897000          videoencoder gstvideoencoder.c:1643:gst_video_encoder_change_state:<vpuenc_h264-0> error: Failed to start encoder
0:00:00.054321250  1474 0xaaaac8897000 INFO     posting message: Could not initialize supporting library.
0:00:00.054391000  1474 0xaaaac8897000 INFO     posted error message: Could not initialize supporting library.
0:00:00.054416250  1474 0xaaaac8897000 INFO     have FAILURE change_state return
0:00:00.054438375  1474 0xaaaac8897000 INFO     aborting state from READY to PAUSED
0:00:00.054464625  1474 0xaaaac8897000 INFO     child 'vpuenc_h264-0' failed to go to state 3(PAUSED)

I inspected the plugins using gst-inspect-1.0 | grep -i vpu gst-inspect-1.0 | grep -i vpu and I got the following:

vpu:  vpuenc_h264: IMX VPU-based AVC/H264 video encoder
vpu:  vpuenc_vp8: IMX VPU-based VP8 video encoder 
vpu:  vpudec: IMX VPU-based video decoder

Is is possible to do it without sudo ?

Answer 1

The reason why this happens is that the VPU devices are owned by root. I added the current user to a new group and changed the group of the VPU devices to the new group then I changed the permission of the group to read and write.

# change the VPU devices group to a group called video
    sudo chgrp video /dev/mxc_*
    sudo chgrp video /dev/ion
# grant read and write permissions to the group
    sudo chmod 660 /dev/mxc_*
    sudo chmod 660 /dev/ion