GPMF telemetry
Also known as: GoPro Metadata Format, GPMF, GoPro telemetry
GoPro's format for sensor data stored inside each MP4: gyroscope, accelerometer and, on GPS models, location and speed, all synced with the video.
Updated
What it means
GPMF, the GoPro Metadata Format, is how GoPro cameras store sensor readings inside the video file. Alongside the picture and sound, each MP4 carries a separate data track with timestamped samples from the gyroscope and accelerometer and, on models with GPS, the location, altitude and speed.
Because the data is recorded in sync with the frames, software can later tell exactly how fast you were going, how hard you landed or how the camera rotated at any moment of the clip. GoPro has published the format openly, so third-party tools can read it too. DJI drones keep comparable flight data in a separate SRT file instead.
How it works in practice
The most visible use is a telemetry overlay: speed, altitude, G-force or a route map drawn over the footage. GoPro Quik offers simple gauges, and dedicated tools such as Telemetry Overlay give full control. The gyro data also lets tools like Gyroflow stabilize footage after the fact, which is why some riders turn in-camera stabilization off and rely on the data instead.
GPS support varies by model. GoPro added GPS with the HERO5 Black, dropped it on the HERO12 Black and brought it back on the HERO13 Black. On models that have it, GPS must be switched on in the settings and needs a satellite lock before you start recording.
What to watch out for
Telemetry disappears easily. Exporting or converting clips through most editors and converters rebuilds the file with only video and audio, silently dropping the GPMF track. If you want overlays, extract the data from the original camera files, not from an edit or a compressed copy.
GPS is the other weak spot. Starting to record the moment you power on, before the camera has a lock, leaves the first minutes with no position data or wild jumps, and tree cover, canyons and tunnels cause gaps. Give the camera a minute in the open first. Also remember that location data shows exactly where you were, including your home, so strip it before sharing original files publicly.
How RawClip handles it
RawClip does not read GPMF data and does not add telemetry overlays; the AI judges motion and peak action from the picture itself. If you want speed or altitude gauges in the video, render them onto the clips with a telemetry tool before uploading, so they become part of the image. Otherwise, upload the GoPro files as they are.