Given a video,I need to calculate the time at which an event occurs and then store it.
For eg: given a video of 25 seconds,the output may look like this
Event_YES 00:03
Event_No 00:25
and so on
A similar question was posted on opencv forum (https://answers.opencv.org/question/9955/i-want-to-display-time-in-my-video-using-opencv/)where one of the users had recommended using CV_CAP_PROP_POS_MSEC, and CV_CAP_PROP_POS_AVI_RATIO.
However i am still a bit unclear on how we can use these flags to get the result
for eg I referred to the following link that illustrates usage of PROP_POS_MSEC
refer to answer by nkhendry
Issue here is that if i use the idea suggested in above link my output is of the form
frame no 1 timestamp 480
But I am looking for an output of the following form
00:15
I know I can use a trackbar GUI but if someone can give me suggestions on how to use the flags to get the output in desired form as explained above,it will be nice.
Enclosed is sample code which I used to get timestamps
import cv2
cap = cv2.VideoCapture('path_to_video/video_filename.avi')
frame_no = 0
while(cap.isOpened()):
frame_exists, curr_frame = cap.read()
if frame_exists:
print("for frame : " + str(frame_no) + " timestamp is: ", str(cap.get(cv2.CAP_PROP_POS_MSEC)))
else:
break
frame_no += 1
cap.release()
Actually i was the one who posted the question on stack overflow,and yes I understand the answer is in milliseconds.On executing the code,this is the output
for frame : 0 timestamp is: 0.0
for frame : 1 timestamp is: 40.0
for frame : 2 timestamp is: 80.0
for frame : 3 timestamp is: 120.0
for frame : 4 timestamp is: 160.0
for frame : 5 timestamp is: 200.0
for frame : 6 timestamp is: 240.0
for frame : 7 timestamp is: 280.0
for frame : 8 timestamp is: 320.0
for frame : 9 timestamp is: 360.0
for frame : 10 timestamp is: 400.0
for frame : 11 timestamp is: 440.0
for frame : 12 timestamp is: 480.0
for frame : 13 timestamp is: 520.0
for frame : 14 timestamp is: 560.0
for frame : 15 timestamp is: 600.0
for frame : 16 timestamp is: 640.0
for frame : 17 timestamp is: 680.0
for frame : 18 timestamp is: 720.0
for frame : 19 timestamp is: 760.0
for frame : 20 timestamp is: 800.0
for frame : 21 timestamp is: 840.0
for frame : 22 timestamp is: 880.0
for frame : 23 timestamp is: 920.0
for frame : 24 timestamp is: 960.0
for frame : 25 timestamp is: 1000.0
for frame : 26 timestamp is: 1040.0
for frame : 27 timestamp is: 1080.0
for frame : 28 timestamp is: 1120.0
for frame : 29 timestamp is: 1160.0
for frame : 30 timestamp is: 1200.0
for frame : 31 timestamp is: 1240.0
for frame : 32 timestamp is: 1280.0
for frame : 33 timestamp is: 1320.0
for frame : 34 timestamp is: 1360.0
for frame : 35 timestamp is: 1400.0000000000002
for frame : 36 timestamp is: 1440.0
for frame : 37 timestamp is: 1480.0
for frame : 38 timestamp is: 1520.0
for frame : 39 timestamp is: 1560.0
for frame : 40 timestamp is: 1600.0
for frame : 41 timestamp is: 1640.0000000000002
for frame : 42 timestamp is: 1680.0
for frame : 43 timestamp is: 1720.0
for frame : 44 timestamp is: 1760.0
for frame : 45 timestamp is: 1800.0
for frame : 46 timestamp is: 1840.0
for frame : 47 timestamp is: 1880.0000000000002
for frame : 48 timestamp is: 1920.0
for frame : 49 timestamp is: 1960.0
for frame : 50 timestamp is: 2000.0
for frame : 51 timestamp is: 2040.0
for frame : 52 timestamp is: 2080.0
for frame : 53 timestamp is: 2120.0
for frame : 54 timestamp is: 2160.0
for frame : 55 timestamp is: 2200.0
for frame : 56 timestamp is: 2240.0
for frame : 57 timestamp is: 2280.0000000000005
for frame : 58 timestamp is: 2320.0
for frame : 59 timestamp is: 2360.0
for frame : 60 timestamp is: 2400.0
for frame : 61 timestamp is: 2440.0
for frame : 62 timestamp is: 2480.0
for frame : 63 timestamp is: 2520.0
for frame : 64 timestamp is: 2560.0
for frame : 65 timestamp is: 2600.0
for frame : 66 timestamp is: 2640.0
for frame : 67 timestamp is: 2680.0
for frame : 68 timestamp is: 2720.0
for frame : 69 timestamp is: 2760.0000000000005
for frame : 70 timestamp is: 2800.0000000000005
for frame : 71 timestamp is: 2840.0
for frame : 72 timestamp is: 2880.0
for frame : 73 timestamp is: 2920.0
for frame : 74 timestamp is: 2960.0
for frame : 75 timestamp is: 3000.0
for frame : 76 timestamp is: 3040.0
for frame : 77 timestamp is: 3080.0
for frame : 78 timestamp is: 3120.0
for frame : 79 timestamp is: 3160.0
for frame : 80 timestamp is: 3200.0
for frame : 81 timestamp is: 3240.0
for frame : 82 timestamp is: 3280.0000000000005
for frame : 83 timestamp is: 3320.0000000000005
for frame : 84 timestamp is: 3360.0
for frame : 85 timestamp is: 3400.0
for frame : 86 timestamp is: 3440.0
for frame : 87 timestamp is: 3480.0
for frame : 88 timestamp is: 3520.0
for frame : 89 timestamp is: 3560.0
for frame : 90 timestamp is: 3600.0
for frame : 91 timestamp is: 3640.0
for frame : 92 timestamp is: 3680.0
for frame : 93 timestamp is: 3720.0
for frame : 94 timestamp is: 3760.0000000000005
for frame : 95 timestamp is: 3800.0000000000005
for frame : 96 timestamp is: 3840.0
for frame : 97 timestamp is: 3880.0
for frame : 98 timestamp is: 3920.0
for frame : 99 timestamp is: 3960.0
for frame : 100 timestamp is: 4000.0
for frame : 101 timestamp is: 4040.0
for frame : 102 timestamp is: 4080.0
for frame : 103 timestamp is: 4120.0
for frame : 104 timestamp is: 4160.0
for frame : 105 timestamp is: 4200.0
for frame : 106 timestamp is: 4240.0
for frame : 107 timestamp is: 4280.0
for frame : 108 timestamp is: 4320.0
for frame : 109 timestamp is: 4360.0
for frame : 110 timestamp is: 4400.0
for frame : 111 timestamp is: 4440.0
for frame : 112 timestamp is: 4480.0
for frame : 113 timestamp is: 4520.000000000001
for frame : 114 timestamp is: 4560.000000000001
for frame : 115 timestamp is: 4600.000000000001
for frame : 116 timestamp is: 4640.0
for frame : 117 timestamp is: 4680.0
for frame : 118 timestamp is: 4720.0
for frame : 119 timestamp is: 4760.0
for frame : 120 timestamp is: 4800.0
for frame : 121 timestamp is: 4840.0
for frame : 122 timestamp is: 4880.0
for frame : 123 timestamp is: 4920.0
for frame : 124 timestamp is: 4960.0
for frame : 125 timestamp is: 5000.0
for frame : 126 timestamp is: 5040.0
for frame : 127 timestamp is: 5080.0
for frame : 128 timestamp is: 5120.0
for frame : 129 timestamp is: 5160.0
for frame : 130 timestamp is: 5200.0
for frame : 131 timestamp is: 5240.0
for frame : 132 timestamp is: 5280.0
for frame : 133 timestamp is: 5320.0
for frame : 134 timestamp is: 5360.0
for frame : 135 timestamp is: 5400.0
for frame : 136 timestamp is: 5440.0
for frame : 137 timestamp is: 5480.0
for frame : 138 timestamp is: 5520.000000000001
for frame : 139 timestamp is: 5560.000000000001
for frame : 140 timestamp is: 5600.000000000001
for frame : 141 timestamp is: 5640.0
for frame : 142 timestamp is: 5680.0
for frame : 143 timestamp is: 5720.0
for frame : 144 timestamp is: 5760.0
for frame : 145 timestamp is: 5800.0
for frame : 146 timestamp is: 5840.0
for frame : 147 timestamp is: 5880.0
for frame : 148 timestamp is: 5920.0
for frame : 149 timestamp is: 5960.0
for frame : 150 timestamp is: 6000.0
for frame : 151 timestamp is: 6040.0
for frame : 152 timestamp is: 6080.0
for frame : 153 timestamp is: 6120.0
for frame : 154 timestamp is: 6160.0
for frame : 155 timestamp is: 6200.0
for frame : 156 timestamp is: 6240.0
for frame : 157 timestamp is: 6280.0
for frame : 158 timestamp is: 6320.0
for frame : 159 timestamp is: 6360.0
for frame : 160 timestamp is: 6400.0
for frame : 161 timestamp is: 6440.0
for frame : 162 timestamp is: 6480.0
for frame : 163 timestamp is: 6520.000000000001
for frame : 164 timestamp is: 6560.000000000001
for frame : 165 timestamp is: 6600.000000000001
for frame : 166 timestamp is: 6640.000000000001
for frame : 167 timestamp is: 6680.0
for frame : 168 timestamp is: 6720.0
for frame : 169 timestamp is: 6760.0
for frame : 170 timestamp is: 6800.0
for frame : 171 timestamp is: 6840.0
for frame : 172 timestamp is: 6880.0
for frame : 173 timestamp is: 6920.0
for frame : 174 timestamp is: 6960.0
for frame : 175 timestamp is: 7000.0
for frame : 176 timestamp is: 7040.0
for frame : 177 timestamp is: 7080.0
for frame : 178 timestamp is: 7120.0
for frame : 179 timestamp is: 7160.0
for frame : 180 timestamp is: 7200.0
for frame : 181 timestamp is: 7240.0
for frame : 182 timestamp is: 7280.0
for frame : 183 timestamp is: 7320.0
for frame : 184 timestamp is: 7360.0
for frame : 185 timestamp is: 7400.0
for frame : 186 timestamp is: 7440.0
for frame : 187 timestamp is: 7480.0
for frame : 188 timestamp is: 7520.000000000001
for frame : 189 timestamp is: 7560.000000000001
for frame : 190 timestamp is: 7600.000000000001
for frame : 191 timestamp is: 7640.000000000001
for frame : 192 timestamp is: 7680.0
for frame : 193 timestamp is: 7720.0
for frame : 194 timestamp is: 7760.0
for frame : 195 timestamp is: 7800.0
for frame : 196 timestamp is: 7840.0
for frame : 197 timestamp is: 7880.0
for frame : 198 timestamp is: 7920.0
for frame : 199 timestamp is: 7960.0
for frame : 200 timestamp is: 8000.0
for frame : 201 timestamp is: 8040.000000000001
for frame : 202 timestamp is: 8080.0
for frame : 203 timestamp is: 8120.000000000001
for frame : 204 timestamp is: 8160.0
for frame : 205 timestamp is: 8200.0
for frame : 206 timestamp is: 8240.0
for frame : 207 timestamp is: 8280.0
for frame : 208 timestamp is: 8320.0
for frame : 209 timestamp is: 8360.0
for frame : 210 timestamp is: 8400.0
for frame : 211 timestamp is: 8440.0
for frame : 212 timestamp is: 8480.0
for frame : 213 timestamp is: 8520.0
for frame : 214 timestamp is: 8560.0
for frame : 215 timestamp is: 8600.0
for frame : 216 timestamp is: 8640.0
for frame : 217 timestamp is: 8680.0
for frame : 218 timestamp is: 8720.0
for frame : 219 timestamp is: 8760.0
for frame : 220 timestamp is: 8800.0
for frame : 221 timestamp is: 8840.0
for frame : 222 timestamp is: 8880.0
for frame : 223 timestamp is: 8920.0
for frame : 224 timestamp is: 8960.0
for frame : 225 timestamp is: 9000.0
for frame : 226 timestamp is: 9040.000000000002
for frame : 227 timestamp is: 9080.0
for frame : 228 timestamp is: 9120.000000000002
for frame : 229 timestamp is: 9160.0
for frame : 230 timestamp is: 9200.000000000002
for frame : 231 timestamp is: 9240.0
for frame : 232 timestamp is: 9280.0
for frame : 233 timestamp is: 9320.0
for frame : 234 timestamp is: 9360.0
for frame : 235 timestamp is: 9400.0
for frame : 236 timestamp is: 9440.0
for frame : 237 timestamp is: 9480.0
for frame : 238 timestamp is: 9520.0
for frame : 239 timestamp is: 9560.0
for frame : 240 timestamp is: 9600.0
for frame : 241 timestamp is: 9640.0
for frame : 242 timestamp is: 9680.0
for frame : 243 timestamp is: 9720.0
for frame : 244 timestamp is: 9760.0
for frame : 245 timestamp is: 9800.0
for frame : 246 timestamp is: 9840.0
for frame : 247 timestamp is: 9880.0
for frame : 248 timestamp is: 9920.0
for frame : 249 timestamp is: 9960.0
for frame : 250 timestamp is: 10000.0
for frame : 251 timestamp is: 10040.000000000002
for frame : 252 timestamp is: 10080.0
for frame : 253 timestamp is: 10120.000000000002
for frame : 254 timestamp is: 10160.0
for frame : 255 timestamp is: 10200.000000000002
for frame : 256 timestamp is: 10240.0
for frame : 257 timestamp is: 10280.0
for frame : 258 timestamp is: 10320.0
for frame : 259 timestamp is: 10360.0
for frame : 260 timestamp is: 10400.0
for frame : 261 timestamp is: 10440.0
for frame : 262 timestamp is: 10480.0
for frame : 263 timestamp is: 10520.0
for frame : 264 timestamp is: 10560.0
for frame : 265 timestamp is: 10600.0
for frame : 266 timestamp is: 10640.0
for frame : 267 timestamp is: 10680.0
for frame : 268 timestamp is: 10720.0
for frame : 269 timestamp is: 10760.0
for frame : 270 timestamp is: 10800.0
for frame : 271 timestamp is: 10840.0
for frame : 272 timestamp is: 0.0
for frame : 273 timestamp is: 0.0
for frame : 274 timestamp is: 0.0
for frame : 275 timestamp is: 0.0
And as suggested by the person in the link (after performign the conversion)
the output is
for frame : 0 timestamp is: 0.0
for frame : 1 timestamp is: 0.04
for frame : 2 timestamp is: 0.08
for frame : 3 timestamp is: 0.12
for frame : 4 timestamp is: 0.16
for frame : 5 timestamp is: 0.2
for frame : 6 timestamp is: 0.24
for frame : 7 timestamp is: 0.28
for frame : 8 timestamp is: 0.32
for frame : 9 timestamp is: 0.36
for frame : 10 timestamp is: 0.4
for frame : 11 timestamp is: 0.44
for frame : 12 timestamp is: 0.48
for frame : 13 timestamp is: 0.52
for frame : 14 timestamp is: 0.56
for frame : 15 timestamp is: 0.6
for frame : 16 timestamp is: 0.64
for frame : 17 timestamp is: 0.68
for frame : 18 timestamp is: 0.72
for frame : 19 timestamp is: 0.76
for frame : 20 timestamp is: 0.8
for frame : 21 timestamp is: 0.84
for frame : 22 timestamp is: 0.88
for frame : 23 timestamp is: 0.92
for frame : 24 timestamp is: 0.96
for frame : 25 timestamp is: 1.0
for frame : 26 timestamp is: 1.04
for frame : 27 timestamp is: 1.08
for frame : 28 timestamp is: 1.12
for frame : 29 timestamp is: 1.16
for frame : 30 timestamp is: 1.2
for frame : 31 timestamp is: 1.24
for frame : 32 timestamp is: 1.28
for frame : 33 timestamp is: 1.32
for frame : 34 timestamp is: 1.36
for frame : 35 timestamp is: 1.4000000000000001
for frame : 36 timestamp is: 1.44
for frame : 37 timestamp is: 1.48
for frame : 38 timestamp is: 1.52
for frame : 39 timestamp is: 1.56
for frame : 40 timestamp is: 1.6
for frame : 41 timestamp is: 1.6400000000000001
for frame : 42 timestamp is: 1.68
for frame : 43 timestamp is: 1.72
for frame : 44 timestamp is: 1.76
for frame : 45 timestamp is: 1.8
for frame : 46 timestamp is: 1.84
for frame : 47 timestamp is: 1.8800000000000003
for frame : 48 timestamp is: 1.92
for frame : 49 timestamp is: 1.96
for frame : 50 timestamp is: 2.0
for frame : 51 timestamp is: 2.04
for frame : 52 timestamp is: 2.08
for frame : 53 timestamp is: 2.12
for frame : 54 timestamp is: 2.16
for frame : 55 timestamp is: 2.2
for frame : 56 timestamp is: 2.24
for frame : 57 timestamp is: 2.2800000000000002
for frame : 58 timestamp is: 2.32
for frame : 59 timestamp is: 2.36
for frame : 60 timestamp is: 2.4
for frame : 61 timestamp is: 2.44
for frame : 62 timestamp is: 2.48
for frame : 63 timestamp is: 2.52
for frame : 64 timestamp is: 2.56
for frame : 65 timestamp is: 2.6
for frame : 66 timestamp is: 2.64
for frame : 67 timestamp is: 2.68
for frame : 68 timestamp is: 2.72
for frame : 69 timestamp is: 2.7600000000000007
for frame : 70 timestamp is: 2.8000000000000003
for frame : 71 timestamp is: 2.84
for frame : 72 timestamp is: 2.88
for frame : 73 timestamp is: 2.92
for frame : 74 timestamp is: 2.96
for frame : 75 timestamp is: 3.0
for frame : 76 timestamp is: 3.04
for frame : 77 timestamp is: 3.08
for frame : 78 timestamp is: 3.12
for frame : 79 timestamp is: 3.16
for frame : 80 timestamp is: 3.2
for frame : 81 timestamp is: 3.24
for frame : 82 timestamp is: 3.2800000000000002
for frame : 83 timestamp is: 3.3200000000000003
for frame : 84 timestamp is: 3.36
for frame : 85 timestamp is: 3.4
for frame : 86 timestamp is: 3.44
for frame : 87 timestamp is: 3.48
for frame : 88 timestamp is: 3.52
for frame : 89 timestamp is: 3.56
for frame : 90 timestamp is: 3.6
for frame : 91 timestamp is: 3.64
for frame : 92 timestamp is: 3.68
for frame : 93 timestamp is: 3.72
for frame : 94 timestamp is: 3.7600000000000007
for frame : 95 timestamp is: 3.8000000000000003
for frame : 96 timestamp is: 3.84
for frame : 97 timestamp is: 3.88
for frame : 98 timestamp is: 3.92
for frame : 99 timestamp is: 3.96
for frame : 100 timestamp is: 4.0
for frame : 101 timestamp is: 4.04
for frame : 102 timestamp is: 4.08
for frame : 103 timestamp is: 4.12
for frame : 104 timestamp is: 4.16
for frame : 105 timestamp is: 4.2
for frame : 106 timestamp is: 4.24
for frame : 107 timestamp is: 4.28
for frame : 108 timestamp is: 4.32
for frame : 109 timestamp is: 4.36
for frame : 110 timestamp is: 4.4
for frame : 111 timestamp is: 4.44
for frame : 112 timestamp is: 4.48
for frame : 113 timestamp is: 4.520000000000001
for frame : 114 timestamp is: 4.5600000000000005
for frame : 115 timestamp is: 4.6000000000000005
for frame : 116 timestamp is: 4.64
for frame : 117 timestamp is: 4.68
for frame : 118 timestamp is: 4.72
for frame : 119 timestamp is: 4.76
for frame : 120 timestamp is: 4.8
for frame : 121 timestamp is: 4.84
for frame : 122 timestamp is: 4.88
for frame : 123 timestamp is: 4.92
for frame : 124 timestamp is: 4.96
for frame : 125 timestamp is: 5.0
for frame : 126 timestamp is: 5.04
for frame : 127 timestamp is: 5.08
for frame : 128 timestamp is: 5.12
for frame : 129 timestamp is: 5.16
for frame : 130 timestamp is: 5.2
for frame : 131 timestamp is: 5.24
for frame : 132 timestamp is: 5.28
for frame : 133 timestamp is: 5.32
for frame : 134 timestamp is: 5.36
for frame : 135 timestamp is: 5.4
for frame : 136 timestamp is: 5.44
for frame : 137 timestamp is: 5.48
for frame : 138 timestamp is: 5.520000000000001
for frame : 139 timestamp is: 5.5600000000000005
for frame : 140 timestamp is: 5.6000000000000005
for frame : 141 timestamp is: 5.64
for frame : 142 timestamp is: 5.68
for frame : 143 timestamp is: 5.72
for frame : 144 timestamp is: 5.76
for frame : 145 timestamp is: 5.8
for frame : 146 timestamp is: 5.84
for frame : 147 timestamp is: 5.88
for frame : 148 timestamp is: 5.92
for frame : 149 timestamp is: 5.96
for frame : 150 timestamp is: 6.0
for frame : 151 timestamp is: 6.04
for frame : 152 timestamp is: 6.08
for frame : 153 timestamp is: 6.12
for frame : 154 timestamp is: 6.16
for frame : 155 timestamp is: 6.2
for frame : 156 timestamp is: 6.24
for frame : 157 timestamp is: 6.28
for frame : 158 timestamp is: 6.32
for frame : 159 timestamp is: 6.36
for frame : 160 timestamp is: 6.4
for frame : 161 timestamp is: 6.44
for frame : 162 timestamp is: 6.48
for frame : 163 timestamp is: 6.520000000000001
for frame : 164 timestamp is: 6.5600000000000005
for frame : 165 timestamp is: 6.6000000000000005
for frame : 166 timestamp is: 6.640000000000001
for frame : 167 timestamp is: 6.68
for frame : 168 timestamp is: 6.72
for frame : 169 timestamp is: 6.76
for frame : 170 timestamp is: 6.8
for frame : 171 timestamp is: 6.84
for frame : 172 timestamp is: 6.88
for frame : 173 timestamp is: 6.92
for frame : 174 timestamp is: 6.96
for frame : 175 timestamp is: 7.0
for frame : 176 timestamp is: 7.04
for frame : 177 timestamp is: 7.08
for frame : 178 timestamp is: 7.12
for frame : 179 timestamp is: 7.16
for frame : 180 timestamp is: 7.2
for frame : 181 timestamp is: 7.24
for frame : 182 timestamp is: 7.28
for frame : 183 timestamp is: 7.32
for frame : 184 timestamp is: 7.36
for frame : 185 timestamp is: 7.4
for frame : 186 timestamp is: 7.44
for frame : 187 timestamp is: 7.48
for frame : 188 timestamp is: 7.520000000000001
for frame : 189 timestamp is: 7.5600000000000005
for frame : 190 timestamp is: 7.6000000000000005
for frame : 191 timestamp is: 7.640000000000001
for frame : 192 timestamp is: 7.68
for frame : 193 timestamp is: 7.72
for frame : 194 timestamp is: 7.76
for frame : 195 timestamp is: 7.8
for frame : 196 timestamp is: 7.84
for frame : 197 timestamp is: 7.88
for frame : 198 timestamp is: 7.92
for frame : 199 timestamp is: 7.96
for frame : 200 timestamp is: 8.0
for frame : 201 timestamp is: 8.040000000000001
for frame : 202 timestamp is: 8.08
for frame : 203 timestamp is: 8.120000000000001
for frame : 204 timestamp is: 8.16
for frame : 205 timestamp is: 8.2
for frame : 206 timestamp is: 8.24
for frame : 207 timestamp is: 8.28
for frame : 208 timestamp is: 8.32
for frame : 209 timestamp is: 8.36
for frame : 210 timestamp is: 8.4
for frame : 211 timestamp is: 8.44
for frame : 212 timestamp is: 8.48
for frame : 213 timestamp is: 8.52
for frame : 214 timestamp is: 8.56
for frame : 215 timestamp is: 8.6
for frame : 216 timestamp is: 8.64
for frame : 217 timestamp is: 8.68
for frame : 218 timestamp is: 8.72
for frame : 219 timestamp is: 8.76
for frame : 220 timestamp is: 8.8
for frame : 221 timestamp is: 8.84
for frame : 222 timestamp is: 8.88
for frame : 223 timestamp is: 8.92
for frame : 224 timestamp is: 8.96
for frame : 225 timestamp is: 9.0
for frame : 226 timestamp is: 9.040000000000003
for frame : 227 timestamp is: 9.08
for frame : 228 timestamp is: 9.120000000000001
for frame : 229 timestamp is: 9.16
for frame : 230 timestamp is: 9.200000000000001
for frame : 231 timestamp is: 9.24
for frame : 232 timestamp is: 9.28
for frame : 233 timestamp is: 9.32
for frame : 234 timestamp is: 9.36
for frame : 235 timestamp is: 9.4
for frame : 236 timestamp is: 9.44
for frame : 237 timestamp is: 9.48
for frame : 238 timestamp is: 9.52
for frame : 239 timestamp is: 9.56
for frame : 240 timestamp is: 9.6
for frame : 241 timestamp is: 9.64
for frame : 242 timestamp is: 9.68
for frame : 243 timestamp is: 9.72
for frame : 244 timestamp is: 9.76
for frame : 245 timestamp is: 9.8
for frame : 246 timestamp is: 9.84
for frame : 247 timestamp is: 9.88
for frame : 248 timestamp is: 9.92
for frame : 249 timestamp is: 9.96
for frame : 250 timestamp is: 10.0
for frame : 251 timestamp is: 10.040000000000003
for frame : 252 timestamp is: 10.08
for frame : 253 timestamp is: 10.120000000000001
for frame : 254 timestamp is: 10.16
for frame : 255 timestamp is: 10.200000000000001
for frame : 256 timestamp is: 10.24
for frame : 257 timestamp is: 10.28
for frame : 258 timestamp is: 10.32
for frame : 259 timestamp is: 10.36
for frame : 260 timestamp is: 10.4
for frame : 261 timestamp is: 10.44
for frame : 262 timestamp is: 10.48
for frame : 263 timestamp is: 10.52
for frame : 264 timestamp is: 10.56
for frame : 265 timestamp is: 10.6
for frame : 266 timestamp is: 10.64
for frame : 267 timestamp is: 10.68
for frame : 268 timestamp is: 10.72
for frame : 269 timestamp is: 10.76
for frame : 270 timestamp is: 10.8
for frame : 271 timestamp is: 10.84
for frame : 272 timestamp is: 0.0
for frame : 273 timestamp is: 0.0
for frame : 274 timestamp is: 0.0
for frame : 275 timestamp is: 0.0
However this leads to more questions at the time the video ends the time is 11 seconds but in this case for frame 275 timestamp is 0 ,why is that.
Secondly I can round these timestamps to get the result I want,but I feel that rounding is not the solution to the problem
Also I was looking for an answer that will help me use the flags mentioned in the above post.
miscalculations inside of OpenCV or ffmpeg. that code is not well maintained. it assumes that “a frame rate” exists and is correct (often it’s not), and ignores the reality of Presentation Timestamps (PTS). frames could be spaced nearly arbitrarily, and sometimes they are.
assuming your file is 25 fps and generally well-behaved, you can use the frame numbers instead. that’ll be equal to what was calculated there (OpenCV does the same), but doesn’t evaluate to0.0 in the end. I have no idea why that happens.
if you want whole seconds, you’ll need to round in some way. I don’t know why you have an issue with fractions of seconds.
what about those flags? they’re flags for accessing (setting/getting) properties.
I’d recommend against using AVI_RATIO because that indicates outdated technology and is probably maintained even worse than everything else.
Ok thanks .Is there a way to know if a video is well behaved or not.(for eg,if all frames are spaced equally is that a way of saying it’s well behaved)
also,if possible can you please recommend me some other sources that will give me a better understanding of basic video processing in opencv (looking for something other than opencv docs)