I have a DJI P4A. Has anyone figured out how to calculate vehicles MPH based on FPS with a know distance? Not sure how to break out individual frames in video with time stamps.
Calculating MPH
- Thread starter Mike_P4A
- Start date
That depends on the aircraft speed. That one is tough to calculate. The speed will vary depending on which values you are looking at to calculate. To get a better number you would need to look at the aircraft .dat file, due to the latency of the device files which can also vary. IMO, you are attempting too be much to precise....there are always tolerances one way or the other.
Video frames and Time stamps are easy ....
If you enable the subtitle routine (caption) so the video has an accompanying data file. This is written same as a Subtitle file for movie videos and with a viewer can be displayed or not as desired.
The data to display can be edited in Notepad if you wish to remove any data not required - as long as the time line is not altered.
It must have same name as the video file and in the same directory.
To be able to embed and then extract frames with the time data displayed on - then you need a program such as : Handbrake.
This will combine your video and subtitle data file into one.
Once that is done - any video editor can then let you 'snapshot' any frame .... save as a jpg or whatever.
If you enable the subtitle routine (caption) so the video has an accompanying data file. This is written same as a Subtitle file for movie videos and with a viewer can be displayed or not as desired.
The data to display can be edited in Notepad if you wish to remove any data not required - as long as the time line is not altered.
It must have same name as the video file and in the same directory.
To be able to embed and then extract frames with the time data displayed on - then you need a program such as : Handbrake.
This will combine your video and subtitle data file into one.
Once that is done - any video editor can then let you 'snapshot' any frame .... save as a jpg or whatever.
