# USB Camera MJPEG to h265 **URL:** \ **Category:** Jetson Nano\ **Created:** [September 23, 2019, 9:20pm UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178 "2019-09-23T21:20:31Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![mckelvaney](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mckelvaney](https://forums.developer.nvidia.com/u/mckelvaney)\ **Post date:** [September 23, 2019, 9:20pm UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178/1 "2019-09-23T21:20:31Z")
I am using the Jetson Nano to capture video from a UVC camera using the v4l2src plugin, but when using the pipeline below, the video is only around 700k and does not contain any video. I have read the `ACCELERATED GSTREAMER USER GUIDE`, but it does not contain much information for sending jpeg streams to omxh265enc. Any advice would be greatly received. ```auto gst-launch-1.0 -vvv v4l2src device=/dev/video0 do-timestamp=true ! image/jpeg, width=3264, height=2448, framerate=15/1 ! jpegparse ! nvjpegdec ! 'video/x-raw' ! nvvidconv ! 'video/x-raw(memory:NVMM),format=I420' ! omxh265enc ! matroskamux ! filesink location=h265_example.mkv ``` ---
**Author:** ![DaneLLL](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/danelll/32/14043_2.png) [@DaneLLL](https://forums.developer.nvidia.com/u/DaneLLL)\ **Post date:** [September 24, 2019, 2:29am UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178/2 "2019-09-24T02:29:57Z")
Hi, You may break down jpeg decoding and h265 encoding. The following pipeline can check if jpeg decoding is working: ```auto gst-launch-1.0 -vvv v4l2src device=/dev/video0 do-timestamp=true ! image/jpeg, width=3264, height=2448, framerate=15/1 ! jpegparse ! nvjpegdec ! 'video/x-raw' ! nvvidconv ! 'video/x-raw(memory:NVMM),format=I420,width=1920,height=1080' ! nvoverlaysink ``` ---
**Author:** ![mckelvaney](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mckelvaney](https://forums.developer.nvidia.com/u/mckelvaney)\ **Post date:** [September 24, 2019, 8:47am UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178/3 "2019-09-24T08:47:49Z")
When running the provided command the display shows a single frame and then the terminal shows the following messages: ```auto Additional debug info: gstbasesink.c(2902): gst_base_sink_is_too_late (): /GstPipeline:pipeline0/GstNvOverlaySink-nvoverlaysink:nvoverlaysink-nvoverlaysink0: There may be a timestamping problem, or this computer is too slow. WARNING: from element /GstPipeline:pipeline0/GstNvOverlaySink-nvoverlaysink:nvoverlaysink-nvoverlaysink0: A lot of buffers are being dropped. Additional debug info: gstbasesink.c(2902): gst_base_sink_is_too_late (): /GstPipeline:pipeline0/GstNvOverlaySink-nvoverlaysink:nvoverlaysink-nvoverlaysink0: There may be a timestamping problem, or this computer is too slow. ``` The hardware accelerated jpeg decoding cannot handle this amount of data? This seems surprising. ---
**Author:** ![Honey\_Patouceul](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/honey_patouceul/32/389777_2.png) [@Honey\_Patouceul](https://forums.developer.nvidia.com/u/Honey_Patouceul)\ **Post date:** [September 24, 2019, 9:43am UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178/4 "2019-09-24T09:43:47Z")
Assuming you have no CSI camera connected, and /dev/video0 appears a few seconds after you plug your UVC camera in, check which formats your camera driver provides with: ```auto v4l2-ctl -d /dev/video0 --list-formats-ext ``` (v4l2-ctl is available from apt package v4l-utils) Get a supported MJPG mode, for example if seeing this: ```auto Index : 1 Type : Video Capture Pixel Format: 'MJPG' (compressed) Name : Motion-JPEG Size: Discrete 640x480 Interval: Discrete 0.008s (120.000 fps) Interval: Discrete 0.011s (90.000 fps) Interval: Discrete 0.017s (60.000 fps) Interval: Discrete 0.033s (30.000 fps) Interval: Discrete 0.042s (24.000 fps) Interval: Discrete 0.050s (20.000 fps) Interval: Discrete 0.067s (15.000 fps) Interval: Discrete 0.100s (10.000 fps) Interval: Discrete 0.133s (7.500 fps) Interval: Discrete 0.200s (5.000 fps) ``` I’d suggest to first try with low resolution and framerate. You may then try this pipeline: ```auto gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'image/jpeg, width=640, height=480, framerate=5/1, format=MJPG' ! jpegdec ! xvimagesink ``` If this doesn’t work, you may post the output of these commands for better advice, and may also try to use io-mode(=1 or 2) option of v4l2src plugin. ---
**Author:** ![johlim](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@johlim](https://forums.developer.nvidia.com/u/johlim)\ **Post date:** [September 30, 2019, 9:48am UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178/5 "2019-09-30T09:48:01Z")
hi everyone I want to stream h264 with uvc camera(mjpg) so i trying like this " nvidia@nvidia:~/source/gst-rtsp-server-1.14.5/examples$ ./test-launch “v4l2src device=/dev/video0 do-timestamp=true ! image/jpeg, width=640, height=480, framerate=30/1 ! jpegparse ! nvjpegdec ! ‘video/x-raw’ ! nvvidconv ! ‘video/x-raw(memory:NVMM),format=I420,width=640,height=480’ ! omxh265enc ! rtph265pay name=pay0 pt=96” stream ready at rtsp://127.0.0.1:8554/test No protocol specified nvbuf\_utils: Could not get EGL display connection (test-launch:28114): GStreamer-CRITICAL \*\*: 18:43:18.220: gst\_element\_make\_from\_uri: assertion ‘gst\_uri\_is\_valid (uri)’ failed (test-launch:28114): GStreamer-CRITICAL \*\*: 18:43:18.222: gst\_element\_make\_from\_uri: assertion ‘gst\_uri\_is\_valid (uri)’ failed (test-launch:28114): GStreamer-CRITICAL \*\*: 18:43:18.228: gst\_element\_link\_pads\_filtered: assertion ‘GST\_IS\_BIN (parent)’ failed (test-launch:28114): GStreamer-CRITICAL \*\*: 18:43:38.248: gst\_element\_make\_from\_uri: assertion ‘gst\_uri\_is\_valid (uri)’ failed (test-launch:28114): GStreamer-CRITICAL \*\*: 18:43:38.249: gst\_element\_make\_from\_uri: assertion ‘gst\_uri\_is\_valid (uri)’ failed (test-launch:28114): GStreamer-CRITICAL \*\*: 18:43:38.249: gst\_element\_link\_pads\_filtered: assertion ‘GST\_IS\_BIN (parent)’ failed " * * * nvidia@nvidia:~/source/gst-rtsp-server-1.14.5/examples$ v4l2-ctl -d /dev/video0 --list-formats-ext ioctl: VIDIOC\_ENUM\_FMT Index : 0 Type : Video Capture Pixel Format: ‘YUYV’ Name : YUYV 4:2:2 Size: Discrete 2592x1944 Interval: Discrete 0.133s (7.500 fps) Interval: Discrete 0.267s (3.750 fps) Size: Discrete 1920x1080 Interval: Discrete 0.067s (15.000 fps) Interval: Discrete 0.133s (7.500 fps) Size: Discrete 1280x960 Interval: Discrete 0.033s (30.000 fps) Interval: Discrete 0.067s (15.000 fps) Size: Discrete 1280x720 Interval: Discrete 0.033s (30.000 fps) Interval: Discrete 0.067s (15.000 fps) Size: Discrete 640x480 Interval: Discrete 0.008s (120.000 fps) Interval: Discrete 0.011s (90.000 fps) Interval: Discrete 0.017s (60.000 fps) Interval: Discrete 0.033s (30.000 fps) Size: Discrete 320x240 Interval: Discrete 0.008s (120.000 fps) Interval: Discrete 0.011s (90.000 fps) Interval: Discrete 0.017s (60.000 fps) Interval: Discrete 0.033s (30.000 fps) ``` Index : 1 Type : Video Capture Pixel Format: 'MJPG' (compressed) Name : Motion-JPEG Size: Discrete 1920x1080 Interval: Discrete 0.033s (30.000 fps) Interval: Discrete 0.067s (15.000 fps) Size: Discrete 1280x720 Interval: Discrete 0.022s (45.000 fps) Interval: Discrete 0.033s (30.000 fps) Interval: Discrete 0.067s (15.000 fps) Size: Discrete 640x480 Interval: Discrete 0.033s (30.000 fps) Interval: Discrete 0.067s (15.000 fps) ``` What should it review ? ---
**Author:** ![Honey\_Patouceul](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/honey_patouceul/32/389777_2.png) [@Honey\_Patouceul](https://forums.developer.nvidia.com/u/Honey_Patouceul)\ **Post date:** [September 30, 2019, 6:48pm UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178/6 "2019-09-30T18:48:06Z")
You may first try to access camera before further encoding/streaming. For YUYV422, you may try video format YUY2: ```auto gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480, framerate=30/1, format=YUY2 ! videoconvert ! xvimagesink ``` For MJPG, you would try jpeg format MJPG: ```auto gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg, width=640, height=480, framerate=30/1, format=MJPG ! jpegdec ! xvimagesink #if it fails try to add jpegparse gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg, width=640, height=480, framerate=30/1, format=MJPG ! jpegparse ! jpegdec ! xvimagesink ``` Does one work ? If it works, you would try to encode and write into file for checking that encoding works: ```auto gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480, framerate=30/1, format=YUY2 ! nvvidconv ! 'video/x-raw(memory:NVMM), format=NV12' ! omxh265enc ! matroskamux ! filesink location=test_YUY2_H265enc.mkv ``` ```auto gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg, width=640, height=480, framerate=30/1, format=MJPG ! jpegdec ! nvvidconv ! 'video/x-raw(memory:NVMM), format=NV12' ! omxh265enc ! matroskamux ! filesink location=test_MJPG_H265enc.mkv ``` If it’s fine, you would try to stream with test-launch: ```auto test-launch "v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480, framerate=30/1, format=YUY2 ! nvvidconv ! video/x-raw(memory:NVMM), format=NV12 ! omxh265enc ! rtph265pay name=pay0 pt=96 config-interval=1 " ``` ```auto test-launch "v4l2src device=/dev/video0 ! image/jpeg, width=640, height=480, framerate=30/1, format=MJPG ! jpegdec ! nvvidconv ! video/x-raw(memory:NVMM), format=NV12 ! omxh265enc ! rtph265pay name=pay0 pt=96 config-interval=1 " ``` ---
**Author:** ![johlim](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@johlim](https://forums.developer.nvidia.com/u/johlim)\ **Post date:** [October 1, 2019, 6:04am UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178/7 "2019-10-01T06:04:37Z")
> [@](#): > > You may first try to access camera before further encoding/streaming. > > For YUYV422, you may try video format YUY2: > > ```auto > gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480, framerate=30/1, format=YUY2 ! videoconvert ! xvimagesink > > ``` > > For MJPG, you would try jpeg format MJPG: > > ```auto > gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg, width=640, height=480, framerate=30/1, format=MJPG ! jpegdec ! xvimagesink > #if it fails try to add jpegparse > gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg, width=640, height=480, framerate=30/1, format=MJPG ! jpegparse ! jpegdec ! xvimagesink > > ``` > > Does one work ? > > If it works, you would try to encode and write into file for checking that encoding works: > > ```auto > gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480, framerate=30/1, format=YUY2 ! nvvidconv ! 'video/x-raw(memory:NVMM), format=NV12' ! omxh265enc ! matroskamux ! filesink location=test_YUY2_H265enc.mkv > > ``` > > ```auto > gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg, width=640, height=480, framerate=30/1, format=MJPG ! jpegdec ! nvvidconv ! 'video/x-raw(memory:NVMM), format=NV12' ! omxh265enc ! matroskamux ! filesink location=test_MJPG_H265enc.mkv > > ``` > > If it’s fine, you would try to stream with test-launch: > > ```auto > test-launch "v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480, framerate=30/1, format=YUY2 ! nvvidconv ! video/x-raw(memory:NVMM), format=NV12 ! omxh265enc ! rtph265pay name=pay0 pt=96 config-interval=1 " > > ``` > > ```auto > test-launch "v4l2src device=/dev/video0 ! image/jpeg, width=640, height=480, framerate=30/1, format=MJPG ! jpegdec ! nvvidconv ! video/x-raw(memory:NVMM), format=NV12 ! omxh265enc ! rtph265pay name=pay0 pt=96 config-interval=1 " > > ``` 1.2.3.4 steps all command works ! Thanks Honey\_Patouceul ---
**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 18, 2021, 5:45pm UTC](https://forums.developer.nvidia.com/t/usb-camera-mjpeg-to-h265/82178/8 "2021-10-18T17:45:26Z")