# Jetson AI Fundamentals S3E1 **URL:** \ **Category:** Jetson Nano\ **Tags:** jetson-inference, camera\ **Created:** [November 30, 2020, 10:31pm UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775 "2020-11-30T22:31:30Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![hossboss7](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@hossboss7](https://forums.developer.nvidia.com/u/hossboss7)\ **Post date:** [November 30, 2020, 10:31pm UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/1 "2020-11-30T22:31:30Z")
Is anyone experiencing camera issues preventing them from running root@nano:/jetson-inference# video-viewer /dev/video0 Im getting the following video-viewer: failed to capture video frame even though i do have a recognized cam connected dev/video0 and utilizing Dustys github docker install ---
**Author:** ![dusty\_nv](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/dusty_nv/32/14043_2.png) [@dusty\_nv](https://forums.developer.nvidia.com/u/dusty_nv)\ **Post date:** [December 1, 2020, 2:18am UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/3 "2020-12-01T02:18:21Z")
Hi @hossboss7, which camera are you using? Can you post the terminal log of when you run that command? Thanks! ---
**Author:** ![hossboss7](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@hossboss7](https://forums.developer.nvidia.com/u/hossboss7)\ **Post date:** [December 1, 2020, 10:21am UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/4 "2020-12-01T10:21:35Z")
Hey, Dusty thanks for your help, seems to be a gstreamer issue. see photos ![Screenshot from 2020-12-01 04-15-19](https://global.discourse-cdn.com/nvidia/original/3X/9/2/929c9d1a3739533a638c5812805de95fa4d5ef5f.jpeg) ---
**Author:** ![hossboss7](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@hossboss7](https://forums.developer.nvidia.com/u/hossboss7)\ **Post date:** [December 1, 2020, 10:25am UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/5 "2020-12-01T10:25:20Z")
Regarding what camera I’m using I believe I’m using a ras cam v2 but not 100% certain bc the cam is inside of an enclosure along with the nano. ![Screenshot from 2020-12-01 04-15-39](https://global.discourse-cdn.com/nvidia/original/3X/c/3/c301bc1fdf6971d927392d06c68cee10697e0ef8.jpeg) ---
**Author:** ![dusty\_nv](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/dusty_nv/32/14043_2.png) [@dusty\_nv](https://forums.developer.nvidia.com/u/dusty_nv)\ **Post date:** [December 1, 2020, 5:44pm UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/6 "2020-12-01T17:44:27Z")
> [@hossboss7](#): > > Regarding what camera I’m using I believe I’m using a ras cam v2 but not 100% certain bc the cam is inside of an enclosure along with the nano. OK gotcha - the Raspberry Pi Camera Module v2 is a MIPI CSI camera, so please try launching video-viewer like this: ```bash $ video-viewer csi://0 ``` If that doesn’t work, please post the output of this `v4l2-ctl` command: ```bash $ sudo apt-get install v4l-utils $ v4l2-ctl --device=/dev/video0 --list-formats-ext ``` ---
**Author:** ![hossboss7](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@hossboss7](https://forums.developer.nvidia.com/u/hossboss7)\ **Post date:** [December 1, 2020, 8:56pm UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/7 "2020-12-01T20:56:47Z")
Dusty thank you very much. Would there be a reason # detectnet /dev/video0 wouldn’t run or #detectnet csi://0 ? Also is there a way to flip the camera in 90 degree angles with the jetson utils? I know previously this was only possible with 180 degree angles or I needed to use opencv, is this still the case? ---
**Author:** ![dusty\_nv](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/dusty_nv/32/14043_2.png) [@dusty\_nv](https://forums.developer.nvidia.com/u/dusty_nv)\ **Post date:** [December 1, 2020, 10:01pm UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/8 "2020-12-01T22:01:45Z")
> [@hossboss7](#): > > Would there be a reason # detectnet /dev/video0 wouldn’t run or #detectnet csi://0 The Raspberry Pi Camera Module v2 should be used as csi://0, because through V4L2 that camera only supports raw 10-bit bayer mode, which neither I or GStreamer have the code to debayer 10-bit. Regardless, it is more efficient to use it through the csi://0 interface (which uses libargus) and the picture quality should be better as it includes ISP processing. > [@hossboss7](#): > > lso is there a way to flip the camera in 90 degree angles with the jetson utils? You should be able to use the `--input-flip=clockwise` (or `--input-flip=counterclockwise`) and run it as: ```bash $ video-viewer --input-flip=clockwise csi://0 ``` For more options to `--input-flip` argument, run the program with `--help` or see here: [https://github.com/dusty-nv/jetson-inference/blob/master/docs/aux-streaming.md#command-line-arguments](https://github.com/dusty-nv/jetson-inference/blob/master/docs/aux-streaming.md#command-line-arguments) ```auto --input-flip=FLIP flip method to apply to input (excludes V4L2): * none (default) * counterclockwise * rotate-180 * clockwise * horizontal * vertical * upper-right-diagonal * upper-left-diagonal ``` ---
**Author:** ![hossboss7](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@hossboss7](https://forums.developer.nvidia.com/u/hossboss7)\ **Post date:** [December 2, 2020, 2:53am UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/9 "2020-12-02T02:53:27Z")
all set thank you sir. up and running! ---
**Author:** ![nadeemm](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/nadeemm/32/367020_2.png) [@nadeemm](https://forums.developer.nvidia.com/u/nadeemm)\ **Post date:** [October 15, 2021, 4:11pm UTC](https://forums.developer.nvidia.com/t/jetson-ai-fundamentals-s3e1/160775/11 "2021-10-15T16:11:23Z")