Jetson nano gstreamer command pipeline error

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hi,

I am trying the below gstreamer pipeline

gst-launch-1.0 -e v4l2src device=/dev/video1 ! tee name=t1 t1. ! queue ! video/x-raw, width=1920, height=1080, framerate=30/1 ! videorate ! video/x-raw, width=1920, height=1080, framerate=30/1 ! nvvidconv ! queue ! nvv4l2h264enc maxperf-enable=1 bitrate=4000000 profile=4 ! queue ! h264parse ! queue ! mux. pulsesrc device=“alsa_input.usb-VXIS_Inc_ezcap_U3_capture-02.analog-stereo” ! queue ! audio/x-raw,width=16,depth=16,rate=44100,channel=1 ! audioconvert ! voaacenc ! aacparse ! mp4mux name=mux ! filesink location=feed1mp1080HW1.mp4 t1. ! queue ! video/x-raw, width=1920, height=1080, framerate=30/1 ! nvvidconv ! queue ! “video/x-raw(memory:NVMM),width=959,height=540,framerate=30/1,format=NV12” ! queue ! nvoverlaysink overlay-x=0 overlay-y=270 overlay-w=959 overlay-h=540 overlay=1 v4l2src device=/dev/video0 io-mode=2 do-timestamp=true ! tee name=t2 t2. ! queue ! image/jpeg,width=1920,height=1080,framerate=30/1 ! videorate ! image/jpeg,width=1920,height=1080,framerate=30/1 ! nvv4l2decoder mjpeg=1 ! nvvidconv ! video/x-raw,width=1920,height=1080,framerate=30/1 ! nvvidconv ! queue ! “video/x-raw(memory:NVMM),framerate=30/1,format=NV12” ! nvv4l2h264enc maxperf-enable=1 bitrate=4000000 profile=4 ! queue ! h264parse ! queue ! mp4mux ! filesink location=feed2mp1080HW1.mp4 t2. ! queue ! image/jpeg,width=1920,height=1080,framerate=30/1 ! nvv4l2decoder mjpeg=1 ! nvvidconv ! video/x-raw,framerate=30/1 ! nvvidconv ! queue ! “video/x-raw(memory:NVMM),framerate=30/1,format=NV12” ! queue ! nvoverlaysink overlay-x=960 overlay-y=270 overlay-w=960 overlay-h=540 overlay=2

This pipeline works without any errors in command line.

I tried to call the same pipeline in a php script using exec() function I get the below error

WARNING: erroneous pipeline: no element “nvvidconv”

What can be the issue for this ?

Thanks in advanced

3

Hi,
Looks like the prebuilt libs are missing in the environment. We have a list in
https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/accelerated_gstreamer.html#wwpID0E06E0HA
Please check if you include the files.

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4

try gst-inspect-1.0 | fgrep nvvid

Should show:
gst-inspect-1.0 | fgrep nvvid
nvvidconv: nvvidconv: NvVidConv Plugin
nvvideosinks: nv3dsink: Nvidia 3D sink
nvvideosink: nvvideosink: nVidia Video Sink
nvvideo4linux2: nvv4l2decoder: NVIDIA v4l2 video decoder
nvvideo4linux2: nvv4l2h264enc: V4L2 H.264 Encoder
nvvideo4linux2: nvv4l2h265enc: V4L2 H.265 Encoder
nvvideo4linux2: nvv4l2vp8enc: V4L2 VP8 Encoder
nvvideo4linux2: nvv4l2vp9enc: V4L2 VP9 Encoder
nvvideocuda: videocuda: CUDA Post processor
tbuckley@BaseSystem_0_5:~/tmp$

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5

Hi @terrysu50z

I get the below output

gst-inspect-1.0 | fgrep nvvid
nvvideosink: nvvideosink: nVidia Video Sink
nvvideocuda: videocuda: CUDA Post processor
nvvideosinks: nv3dsink: Nvidia 3D sink
nvvidconv: nvvidconv: NvVidConv Plugin
nvvideo4linux2: nvv4l2vp9enc: V4L2 VP9 Encoder
nvvideo4linux2: nvv4l2vp8enc: V4L2 VP8 Encoder
nvvideo4linux2: nvv4l2h265enc: V4L2 H.265 Encoder
nvvideo4linux2: nvv4l2h264enc: V4L2 H.264 Encoder
nvvideo4linux2: nvv4l2decoder: NVIDIA v4l2 video decoder

The pipeline is working properly in the command line the issue is coming when it is called from exec() command from a php script

Thank You

6

Hi @DaneLLL

The pipeline is running properly in command line the issue comes when called from a php script

Thank you

7

my gstreamer app is a c/c++ app, I use
mPipeline = gst_parse_launch(CMDLINE, &pGerr);

Maybe there is something similar in php?

Terry

8

I also wrote some plugins and had a problem finding them, can’t remember if LIBPATHs or install fixed the “Can’t find plugin” for me.

nvvidconv is in the correct place and since gst-launch-1.0 and gst-inspect-1.0 find them.

Sorry
Terry

9

Hi,
We don’t have much experience in php script. So other gstreamer plugins are available and only NVIDIA plugins are missing?

It might not help but can try to clean the cache:

$ rm .cache/gstreamer-1.0/registry.aarch64.bin
10

Thanks I will look in to it

11

Thank you I will check these out.

13

Hi @terrysu50z @DaneLLL @kayccc

To make the gstreamer pipeline work in php you need to give the proper permissions to the www-data in the visudo file. All the other elements were working except for the pulsesrc, So I had to replace it with alsasrc now the pipelines are functioning through php script

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