[list] [*] FFMpeg Object will start audio thread by default, if some operation costs a long time, for example, load an extremely big video or online stream over a bad network, even if you choose to close video or pause it before display routine, you can still hear the audio, which is not expected. [*] AVFormatContext and AVCodecContext struct to capture a frame at given timestamp now will create on demand instead of when create new instance, which can slightly speed up opening videos [/list]