This effect reads video directly from the capture card input. It replaces any video on the track so it is normally applied to an empty track. Only one Live Video effect can exist at any time on the timeline. It can not be shared by more than one track. The configuration for the capture card is taken from the recording preferences. Go to Settings → Preferences → Recording to set up the capture card.
In the Video In section where it says Record driver, it should be set to either Video4Linux2 or IEC 61883. Other video drivers have not been tested with Live Video and probably will not work. For live video, the selection for File Format and Video needs to be set to a format the timeline can use. The file format must be Quicktime for Linux and video recording must be enabled for it. Click on the wrench to set the video compression.
The video compression depends on the recording driver. For the Video4Linux2 recording driver, the compression must be Motion JPEG A. For the IEC 61883 driver, the compression must be DV. This gets the driver to generate output in a color model that the timeline can use. Some cards provide color and channel settings. Live video takes the color settings from the values set in the Video In window. Go to File → Record to bring up the recording interface and the Video In window. Values set in the Video in window are used by Live Video. Any channels the capture card supports need to be configured in the Video In interface since the same channels are used by the Live Video effect.
With the video recording configured, highlight a horizontal region of a video track or define in and out points. Then drop the Live Video effect into it. Drop other effects after Live Video to process the live video in realtime. For best results, you should use OpenGL and a video card which supports GL shading language. Go to Settings → Preferences → Playback → Video Out to enable the OpenGL driver.
The CINELERRA-GG Community, 2021