tensorflow_infer运行不出结果

[MambaInVeins]

执行命令python tensorflow_infer.py --img-path img/demo2.jpg
但程序一直运行，显示如下，
...
1454 of -1
read_frame:0.000000, infer time:0.040894, write time:0.000000
1455 of -1
read_frame:0.037940, infer time:0.039937, write time:0.000000
1456 of -1
read_frame:0.000000, infer time:0.040846, write time:0.000000
1457 of -1
read_frame:0.047587, infer time:0.048870, write time:0.000000
1458 of -1
read_frame:0.000000, infer time:0.041887, write time:0.000000
1459 of -1
read_frame:0.036963, infer time:0.039892, write time:0.000000
1460 of -1
read_frame:0.000000, infer time:0.040894, write time:0.000000
1461 of -1
read_frame:0.047889, infer time:0.045881, write time:0.000000
1462 of -1
read_frame:0.000000, infer time:0.038893, write time:0.000000
1463 of -1
read_frame:0.043644, infer time:0.047874, write time:0.000000
...
image弹框图片也是黑的，请问是什么原因呢？