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67 lines
2.1 KiB
Markdown
67 lines
2.1 KiB
Markdown
# Images (GStreamer command-line cheat sheet)
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Images can be added to video.
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In addition, video can be converted into images.
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This page looks at both types.
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## Including images in video
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Gstreamer can show images on video using the `imagefreeze` element.
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### Create a video from an image
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```
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export PIC="https://upload.wikimedia.org/wikipedia/en/thumb/8/80/Wikipedia-logo-v2.svg/263px-Wikipedia-logo-v2.svg.png"
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gst-launch-1.0 \
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uridecodebin uri=$PIC ! \
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imagefreeze ! \
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autovideosink
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```
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### Create a video from multiple images
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Here's the same image four times, done with the help of `compsitor` (a mixer):
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```
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gst-launch-1.0 \
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compositor name=m sink_1::xpos=263 sink_2::ypos=240 sink_3::xpos=263 sink_3::ypos=240 ! autovideosink \
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uridecodebin uri=$PIC ! videoscale ! video/x-raw, width=263, height=240 ! imagefreeze ! m. \
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uridecodebin uri=$PIC ! videoscale ! video/x-raw, width=263, height=240 ! imagefreeze ! m. \
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uridecodebin uri=$PIC ! videoscale ! video/x-raw, width=263, height=240 ! imagefreeze ! m. \
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uridecodebin uri=$PIC ! videoscale ! video/x-raw, width=263, height=240 ! imagefreeze ! m.
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```
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## Capturing video output as images
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### Capture an image as PNG
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The `pngenc` element can create a single PNG:
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```
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gst-launch-1.0 videotestsrc ! pngenc ! filesink location=foo.png
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```
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### Capture an image as JPEG
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The `jpegenc` element can create a single JPEG:
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```
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gst-launch-1.0 videotestsrc ! jpegenc ! filesink location=foo.jpg
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```
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### Capturing images every X seconds
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This example captures one frame every 3 seconds, and places it in files with the format `img00001.jpg`.
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It also displays the video (as the `tee` command sends the video to both `multifilesink` and `autovideosink`).
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To change the frequency, change the `framerate=1/3`.
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e.g. `framerate=2/1` would capture a frame twice a second.
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```
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gst-launch-1.0 -v videotestsrc is-live=true ! clockoverlay font-desc=\"Sans, 48\" ! videoconvert ! videorate ! video/x-raw,framerate=1/3 ! jpegenc ! multifilesink location=file-%02d.jpg
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```
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