![]() By Karol in forum Video Streaming Downloading Replies: 2 Last Post: 23rd Nov 2016, 09:22 Previous. Using chromakey, overlay, and format filters: ffmpeg -re -i background.jpg -f v4l2 -i /dev/video0 -filter_complex "chromakey=color=#326964:similarity=0.07:blend=0. 11.74.1 Syntax 11.74.2 Text expansion 11.74.3 Commands 11.74.4 Examples. By vhelp in forum Programming Replies: 21 Last Post: 5th Feb 2017, 21:34. See How to position drawtext text? Greenscreen / chroma key / replace background With drawtext filter: ffmpeg -f v4l2 -i /dev/video0 -vf "drawtext=text='Hello World':fontsize=12:fontcolor=white:font=Arial:x=w-tw-10:y=h-th-10,format=yuv420p" -f v4l2 /dev/video1 Webcam → ffmpeg → Virtual webcam Add text If you want to draw a text on a video starting from the 3rd second you could use: ffmpeg -i 1.mp4 -vf drawtexttextMy Text:enablegt (t,3) output.mp4. Image to virtual camera ffmpeg -re -loop 1 -i input.jpg -vf format=yuv420p -f v4l2 /dev/video0 Video file (MP4) to virtual camera ffmpeg -re -i input.mp4 -map 0:v -f v4l2 /dev/video0 Example for desktop using x11grab: ffmpeg -f x11grab -framerate 15 -video_size 1280x720 -i :0.0 -f v4l2 /dev/video0 Check output of ls /dev/video* or v4l2-ctl -list-devices. Note that the actual video number may vary depending if an existing device is already using /dev/video0. If you want to remove the package you compiled: sudo apt-get remove v4l2loopback Sudo checkinstall -pkgname=v4l2loopback -pkgversion="$(date +%Y%m%d%H%M)-git" -default If it's not in the repository for your Ubuntu version, or you want the latest version, you can compile it: sudo apt-get install build-essential checkinstall ![]() This is easy but older versions of v4l2loopback have some known bugs, so consider compiling it instead if you encounter any issues. For the syntax of this option, check the (ffmpeg-utils)Color section in the ffmpeg-utils manual. You can append Codec, Filters and other OptionStores to the FFmpeg class and then run the resulting. First you need to install it: Install v4l2loopback Method 1: Install v4l2loopback from the repository sudo apt install v4l2loopback-dkms ffmpeg examples - use expressions for drawtext's x and y Watch on color, box, border, and shadow fontcolor, fontcolorexpr fontcolor: The color to be used for drawing fonts. FFmpegWrapper is a small wrapper for the ffmpeg encoder.
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