The test program for the FIFO muxer allocates a buffer without padding and wraps it into a packet via av_packet_from_data(). This is an API violation. Furthermore, said buffer leaks in case av_packet_from_data() fails. Fix both of these issues by using av_new_packet() instead. Reviewed-by: James Almer <jamrial@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>