Support of .ppm files is realised

AlexeyAB

2018-05-17 fb9fcfb3ba0057b1196d1b95fd53cdb0b874b1c3

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#rm test_dnn_out.avi
 
./darknet detector demo ./cfg/coco.data ./cfg/yolov3.cfg ./yolov3.weightss rtsp://admin:admin12345@192.168.0.228:554 -i 0 -thresh 0.25