Hi Joan Xie,
I need to use the mfw_isink because I'm prerolling a second pipeline before the first one finishes. I found two ways to solve the problem, the first one is to clear the frame buffer after nulling and unreferencing the pipelines. In order to do that I executed the following command:
dd if=/dev/zero of=/dev/fb0
Check the following thread: closing pipeline with imxipuvideosink doesnt clear the output framebuffer · Issue #160 · Freescale/g...
The second way is to create another pipeline and play a black frame. This can be achieved by using the videotestsrc element. I took the following steps before deleting the video:
->Stop the video
->Create a new pipeline with a videotestsrc element, the pipeline should look like this (videotestsrc->queue->mfw_isink).
->Set the properties of videotestsrc to play a black frame.
->Play the pipeline.
->Delete both pipelines.
