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gst_v4l2_buffer_pool_flush() executes streamoff for the output, but streamoff->streamon for the capture of the decoder. gst_v4l2_buffer_pool_streamon() on capture assumes that is able to resurrect the buffers from the pool, but acquiring buffers fails if the buffer pool is still flushing. The decoder needs to stop flushing the pools before calling gst_v4l2_buffer_pool_flush() to restart the v4l2 device. Otherwise starting the decoding thread might fail, because there are no buffers in the capture pool. This fixes a regression that was introduced in 97985a33 ("v4l2videodec: Add dynamic resolution change support"). https://bugzilla.gnome.org/show_bug.cgi?id=796681
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