792eb0cf48
Don't assume that compositor will output only single buffer for single input buffer. If buffer's running time is not completly aligned to output buffer running time or duration, compositor can generate multiple buffers. If that happens, two threads, one is aggregator output thread and main thread were trying to modify buffer in this test. Clear the buffer after shutting down pipeline to avoid the race. Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2836 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5081>