bufferStrawStartPipeline

Sets up a pipeline for buffer sucking. This will allow you to call [gstcheck.global.bufferStrawGetBuffer] to access buffers as they pass over pad.

This function is normally used in unit tests that want to verify that a particular element is outputting correct buffers. For example, you would make a pipeline via [gst.global.parseLaunch], pull out the pad you want to monitor, then call [gstcheck.global.bufferStrawGetBuffer] to get the buffers that pass through pad. The pipeline will block until you have sucked off the buffers.

This function will set the state of bin to PLAYING; to clean up, be sure to call [gstcheck.global.bufferStrawStopPipeline].

Note that you may not start two buffer straws at the same time. This function is intended for unit tests, not general API use. In fact it calls fail_if from libcheck, so you cannot use it outside unit tests.