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我的程序加载ffmpeg的动态库成功后，写av_register_all(); 程序就起不来？把av_register_all()去掉，程序又起来了，难道QT现在不能加载动态库了吗？？？
可能是 PATH 的問題, 檢查一下吧. 另外就是有沒有什麼 error message 呢?
