Gst-launch-1.0 didn't use video1 but I was told that opening vedio1 failed

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

TX2 NX Jetpack 4.6.3

:~$ gst-launch-1.0 v4l2src device=/dev/video0 ! nvvideoconvert ! nvvideoconvert ! nvv4l2h264enc ! decodebin ! nvvideoconvert ! ‘video/x-raw, width=320, height=240’ ! v4l2sink device=/dev/video12
Setting pipeline to PAUSED …
Failed to open /dev/video1: No such file or directory
Failed to open /dev/video2: No such file or directory
Failed to open /dev/video3: No such file or directory
Failed to open /dev/video4: No such file or directory
Failed to open /dev/video5: No such file or directory
Failed to open /dev/video6: No such file or directory
Failed to open /dev/video7: No such file or directory
Failed to open /dev/video8: No such file or directory
Failed to open /dev/video9: No such file or directory
Failed to open /dev/video10: No such file or directory
Failed to open /dev/video11: No such file or directory
Opening in BLOCKING MODE
ArgusV4L2_Open failed: No such file or directory
Opening in BLOCKING MODE
libv4l2: error getting pixformat: Invalid argument
Opening in BLOCKING MODE
Pipeline is live and does not need PREROLL …
Setting pipeline to PLAYING …
New clock: GstSystemClock
Opening in BLOCKING MODE
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261
Redistribute latency…
NvMMLiteOpen : Block : BlockType = 4
===== NVMEDIA: NVENC =====
NvMMLiteBlockCreate : Block : BlockType = 4
H264: Profile = 66, Level = 0
NVMEDIA_ENC: bBlitMode is set to TRUE

3

Hi,
For running v4l2loopback, please try this setup:
Gstreamer v4l2loopback hw mjpeg stream - #5 by Honey_Patouceul

Not sure if Failed to open /dev/video1: No such file or directory is a warning or an issue. It looks like the pipeline is running although the prints show up.

4

Hi,
With the warning prints we can know there’s empty video nodese. You can set to first empty node to avoid the prints.

5

Thank you for reply! I have other questions about this directive, and I will open up a new topic.

6

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