ffprobe -loglevel error -skip_frame nokey -select_streams v:0 -show_entries frame=pkt_pts_time -of csv=print_section=0 "video.mp4" > frames_i.txt
结果是：
0.000000
0.967633
1.935267
2.902900
3.870533
4.838167
5.805800
6.773433
7.741067
8.708700
9.676333
10.643967
11.611600
12.579233
13.546867
14.514500
15.482133
16.449767
17.417400
18.385033
19.352667
20.320300
21.287933
22.255567
23.223200
24.190833
25.158467
26.126100
27.093733
28.061367
29.029000
29.996633
30.964267
31.931900
32.899533
33.867167
34.834800
35.802433
36.770067
37.737700
38.705333
39.672967
40.640600
41.608233
42.575867
43.543500
44.511133
45.478767
46.446400
47.414033
48.381667
49.349300
50.316933
51.284567
52.252200
53.219833
54.054000
55.021633
55.989267
56.956900
57.924533
58.892167
59.859800
60.827433
61.795067
62.195467
63.163100
64.130733
65.098367
66.066000
67.033633
68.001267
68.968900
69.936533
70.904167
71.871800
72.839433
73.807067
74.774700
75.742333
76.709967
77.677600
78.645233
79.612867
80.580500
81.548133
82.515767
83.483400
84.451033
85.418667
86.386300
87.353933
88.321567
89.289200
90.256833
91.224467
92.192100
93.159733
93.793700
94.761333
95.528767
96.496400
97.464033
98.431667
99.132367
100.100000
101.067633
101.334567
102.302200
103.269833
103.736967
104.704600
105.672233
106.506400
107.474033
108.441667
109.409300
110.376933
111.344567
112.312200
113.279833
114.247467
115.215100