DisplayApp is an application that displays the camera image sent by USB CDC.

You can use the prebuilt binaries in bin directory. Or run make build command. displayapp will be build in bin directory.

To record the video as MP4 file, run the following command. /tmp/out.mp4 will be created.

displayapp | ffmpeg -y -f image2pipe -c:v mjpeg -r 30 -i - -vcodec libx264 /tmp/out.mp4

To display the video in the window, run the following command.

displayapp | ffplay -i -

To output jpeg files every 1 seconds, run the following command. /tmp/test*.jpg will be created.

displayapp -p /tmp

To use v4l2loopback, run the following commands. First start v4l2loopback with modprobe command. Then confirm your loopback device with v4l2-ctl command.

sudo modprobe v4l2loopback exclusive_caps=1
v4l2-ctl --list-devices

In my case, the loopback device was /dev/video1. In the case, run the following command.

./displayapp | ffmpeg -y -f image2pipe -c:v mjpeg -r 30 -i - -pix_fmt yuyv422 -f v4l2 /dev/video1

Use -d option to specify the COM port. Do not forget to install ffmpeg.

For example, To record the video as MP4 file, run the following command.

displayapp.exe -d COM5 | ffmpeg -y -f image2pipe -c:v mjpeg -r 30 -i - -vcodec libx264 out.mp4

To display the video in the window, run the following command.

displayapp.exe -d COM5 | ffplay -i -

• GR-LYCHEE
• Camera and LCD sample for GR-Boards
• DisplayApp