//各參數(shù)含義：查看 https://github.com/bilibili/ijkplayer/blob/cced91e3ae3730f5c63f3605b00d25eafcf5b97b/ijkmedia/ijkplayer/ff_ffplay_options.h
    IJKFFOptions *options = [IJKFFOptions optionsByDefault];
    
    [options setPlayerOptionIntValue:maxBuffSize * 1000 forKey:@"max_cached_duration"];
    [options setPlayerOptionIntValue:minBuffSize * 1000 forKey:@"max-buffer-size"]; // max buffer size should be pre-read
    
    [options setPlayerOptionIntValue:1 forKey:@"fast"]; 
    [options setPlayerOptionIntValue:0 forKey:@"packet-buffering"]; // 是否開啟緩沖
    [options setPlayerOptionIntValue:1 forKey:@"framedrop"]; // drop frames when cpu is too slow
    [options setPlayerOptionIntValue:1 forKey:@"start-on-prepared"]; //automatically start playing on prepared
    [options setPlayerOptionIntValue:1  forKey:@"videotoolbox"]; // VideoToolbox: enable
    [options setPlayerOptionIntValue:1 forKey:@"infbuf"];
    [options setPlayerOptionIntValue:1 forKey:@"mediacodec"];
    [options setPlayerOptionIntValue:0 forKey:@"mediacodec-auto-rotate"];//關閉自動旋轉屏
    [options setPlayerOptionIntValue:0 forKey:@"mediacodec-handle-resolution-change"];// 處理分辨率變化
    [options setPlayerOptionIntValue:2 forKey:@"min-frames"];// 默認最小幀數(shù)
    
    ////各參數(shù)含義：https://github.com/bilibili/ijkplayer/blob/cced91e3ae3730f5c63f3605b00d25eafcf5b97b/ijkmedia/ijkplayer/ijkavformat/ijklivehook.c
    [options setFormatOptionIntValue:100 forKey:@"analyzeduration"];
    [options setFormatOptionValue:@"tcp" forKey:@"rtsp_transport"];
    [options setFormatOptionValue:@"nobuffer" forKey:@"fflags"];
    [options setFormatOptionIntValue:200 forKey:@"probesize"]; // 探測size
    [options setFormatOptionIntValue:1 forKey:@"flush_packets"];
    
    // when video is high_fps,below works
    [options setCodecOptionIntValue:IJK_AVDISCARD_ALL forKey:@"skip_loop_filter"];
    [options setCodecOptionIntValue:IJK_AVDISCARD_ALL forKey:@"skip_frame"];
    
    self.player = [[IJKFFMoviePlayerController alloc] initWithContentURL:self.url withOptions:options];