Fixed top-coordinate output when -ext_output is used for video

AlexeyAB

2018-05-28 1b7a1a0f33538c9544ad4bf693b4a4247a5548b8

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classes= 20
train  = data/train_voc.txt
valid  = data/2007_test.txt
#difficult = data/difficult_2007_test.txt
names = data/voc.names
backup = backup/