In this video, I dive deep into the often-overlooked SRT files stored by the DJI Fly app. 📂🔍
Learn how to unlock a treasure trove of data that can take your drone footage to the next level! Whether you’re a data enthusiast or just curious about how to get more out of your drone flights, this tutorial is for you.
What You’ll Learn:
Turning On/Off the ‘Captions’ Feature: Step-by-step instructions to enable or disable SRT file generation in the DJI Fly app.
Working with SRT Files: How to pair SRT files with your video files to display real-time flight data like GPS coordinates, altitude, speed, and more.
Use Cases for SRT Data: Discover the practical applications of SRT data—from enhancing your video content to conducting precise flight analysis.
Why You Need This Knowledge:
Enhance Your Videos: Add valuable data overlays to your footage to give viewers more context.
Flight Analysis: Use SRT data for in-depth post-flight analysis to improve your piloting skills or troubleshoot issues.
Content Creation: Perfect for creators who want to add a professional touch to their drone videos by integrating live flight data.
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Use Cases:
1. Flight Review and Analysis Post-flight analysis: The SRT files can be used to review flight paths, altitudes, and speeds alongside the video footage. This is particularly useful for identifying any issues or optimizing flight performance. Incident investigation: In case of a crash or unexpected event, the telemetry data in the SRT file can help reconstruct the flight to understand what went wrong.
2. Geotagging for Mapping and Surveying GIS integration: The GPS coordinates in the SRT files can be used to geotag specific points of interest in the video, facilitating mapping, land surveying, or any application requiring precise geographical data.
3. Editing and Production Overlay on video: Content creators can use the SRT file to overlay telemetry data on the video, providing viewers with real-time flight data. This is particularly engaging for tutorial videos, documentaries, or drone racing content. Storytelling: For creative projects, the data can be used to narrate a journey or flight path, adding depth to the visual story by including speed, altitude, or location information.
4. Compliance and Reporting Regulatory compliance: For professional drone operators, the SRT file provides a log of the flight that can be used to demonstrate compliance with local aviation regulations or for submitting flight reports. Client reporting: In commercial applications like real estate or construction, the SRT data can be included in client reports to provide additional context about the captured footage.
5. Search and Rescue Operations Precise location tracking: In search and rescue missions, SRT data can help teams pinpoint the exact location of critical footage, aiding in the rescue efforts by providing accurate coordinates of where the footage was captured.
6. Research and Development Data collection: Researchers and developers can use the detailed telemetry data for experiments, simulations, or to improve drone technologies, such as refining algorithms for autonomous flight. These are just a few examples, but the potential uses of the data stored in SRT files can be quite broad depending on the specific needs of the operator or project.
Data Types Stored Within DJI SRT Files:
Frame Information: FrameCnt: 595: Indicates the current frame number in the video. DiffTime: 33ms: Represents the time difference between the current and the previous frame in milliseconds.
Timestamp: 2024-08-04 15:15:28.567: This is the precise date and time when this particular frame was captured.
Camera Settings: ISO: 100: The ISO sensitivity setting of the camera, which controls the camera’s sensitivity to light. Shutter: 1/1000.0: The shutter speed, set to 1/1000th of a second.
Fnum: 2.8: The aperture setting, which controls the amount of light entering the lens.
EV: -1.0: The exposure value compensation, adjusted to underexpose by one stop.
Color_md: default: Indicates that the default color mode was used during capture.
Focal_len: 210.00: The focal length of the lens used, set to 210mm.
Geolocation Data:
Latitude: 49.274447: The latitude coordinate where the drone was located.
Longitude: -124.933530: The longitude coordinate where the drone was located. Altitude
Information:
Rel_alt: 45.100: The relative altitude of the drone above the takeoff point, in meters.
Abs_alt: 115.372: The absolute altitude above sea level, in meters.
Other Data:
Other: CT: 6500: The color temperature, set to 6500K, which corresponds to daylight white balance. This data provides detailed information about the drone’s flight, camera settings, and location, all synchronized with the video footage.
