By default the pipeline generated by setup_pipeline and get_pipeline will have a layer with a shader snippet that automatically samples the video.
If the application wants to sample the video in a completely custom way using its own shader snippet it can set default_sample
to false to avoid this default snippet being added. In that case the application's
snippet can call cogl_gst_sample_video0 to sample the texture itself.
| this |
The VideoSink |
| default_sample |
Whether to add the default sampling |