gstreamer-cheat-sheet/capturing_images.md

Capturing images (GStreamer command-line cheat sheet)

Capture an image as PNG

The pngenc element can create a single PNG:

gst-launch-1.0 videotestsrc ! pngenc ! filesink location=foo.png

### Capture an image as JPEG

The jpegenc element can create a single JPEG:

gst-launch-1.0 videotestsrc ! jpegenc ! filesink location=foo.jpg

Capturing images every X seconds

This example captures one frame every 3 seconds, and places it in files with the format img00001.jpg. It also displays the video (as the tee command sends the video to both multifilesink and autovideosink). To change the frequency, change the framerate=1/3. e.g. framerate=2/1 would capture a frame twice a second.

gst-launch-1.0 videotestsrc ! \
    videoscale ! videoconvert ! video/x-raw,width=640,height=480 ! \
    queue ! decodebin ! tee name=t ! queue ! videoconvert ! videoscale ! \
    videorate ! video/x-raw,width=640,height=480,framerate=1/3  ! \
    jpegenc ! multifilesink location=img%05d.jpg t. ! queue ! autovideosink