ADLINK Technology EVA SDK, User Manual, Page: 26 / 117

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Image and Video Capture Plugins
3.1.4 v4l2src
This element can be used to capture video from v4l2 devices, such as webcams and TV tuner cards.
Note : Only supported on Linux.
For more details, refer to the official documentation at:
https://gstreamer.freedesktop.org/documentation/video4linux2/v4l2src.html?gi-language=c#v4l2src-page
3.1.4.1 Examples Using gst-launch
This pipeline shows the video captured from a webcam with jpeg images.
gst-launch-1.0 v4l2src ! jpegdec ! xvimagesink
This pipeline shows the video captured from a webcam with jpeg images and the buffer number set to output
before sending EOS. For auto-function testing, the output automatically stops when the buffer is reached.
gst-launch-1.0 v4l2src num-buffers=100 ! jpegdec ! xvimagesink
Note : The element ‘xvimagesink’ is only supported on Linux. It is recommended to use the ‘glimagesink’ or
‘d3dvideosink’ elements to display the window on Windows.
3.1.5 multifilesrc
This element reads buffers from sequentially named files. If used together with an image decoder, the “ caps ”
property or a capsfilter must be used to force to caps containing a framerate, otherwise the image decoders send
EOS after the first frame. A videorate element is needed to set timestamps on all buffers after the first one in
accordance with the corresponding framerate.
File names are created by replacing "%d" with the index using printf().
For more details, refer to the official documentation at:
https://gstreamer.freedesktop.org/documentation/multifile/multifilesrc.html?gi-language=c#multifilesrc-page
3.1.5.1 Example Using gst-launch
This pipeline displays a video by joining multiple sequentially named PNG files (img.0000.png, img.0001.png, etc.)..
gst-launch-1.0 multifilesrc location="img.%04d.png" index=0
caps="image/png,framerate=\(fraction\)12/1" ! pngdec ! videoconvert ! videorate !
xvimagesink
Note : The element ‘xvimagesink’ is only supported on Linux. It is recommended to use the ‘glimagesink’ or
‘d3dvideosink’ elements to display the window on Windows.