Too many packets buffered for output stream 0:1.
-max_muxing_queue_size packets [9999 ]
ffmpeg -i aaaa.mp4 -s 1080x1920 -acodec copy -vcodec libx264 -preset ultrafast -y -max_muxing_queue_size 9999 bbbb.mp4
如果不指定 -max_muxing_queue_size packets ,视频处理的速率过快,缓冲池的队列太多会崩溃