telemetrik

Extract GPS, gyroscope, accelerometer, and other sensor data from GoPro video files.

telemetrik is a pure-Python parser for the GoPro Metadata Format (GPMF) — no compiled dependencies, no FFmpeg, just pip install and go.

Install

pip install telemetrik

Usage

Python

from telemetrik import extract_all_telemetry

streams = extract_all_telemetry("GX010042.MP4")

# GPS track
for ts, (lat, lon, alt, spd2d, spd3d, fix, dop) in streams["GPS5"].data:
    if fix >= 3:  # 3D fix
        print(f"{lat:.6f}, {lon:.6f}  alt={alt:.0f}m")

# 200 Hz accelerometer
for ts, (x, y, z) in streams["ACCL"].data:
    print(f"{ts}ms  accel=({x:.2f}, {y:.2f}, {z:.2f}) m/s²")

# Camera orientation quaternions
for ts, (w, x, y, z) in streams["CORI"].data:
    print(f"{ts}ms  quat=({w:.4f}, {x:.4f}, {y:.4f}, {z:.4f})")

Command line

telemetrik GX010042.MP4                        # extract all streams
telemetrik --streams ACCL,GYRO,GPS5 *.MP4      # specific streams, batch

Each stream is saved as <stem>.<fourcc> (e.g. GX010042.accl, GX010042.gps5) in CSV format with millisecond timestamps.

Supported streams

FourCC	Stream	Shape
ACCL	Accelerometer	(x, y, z) m/s²
GYRO	Gyroscope	(x, y, z) rad/s
GPS5	GPS + quality	(lat, lon, alt, speed_2d, speed_3d, fix, dop)
CORI	Camera orientation	(w, x, y, z) quaternion
IORI	Image orientation	(w, x, y, z) quaternion
GRAV	Gravity vector	(x, y, z)
SHUT	Shutter speed	scalar, microseconds
ISOE	ISO	scalar
WBAL	White balance	(temperature, tint)
TMPC	Sensor temperature	scalar, °C

Pass any GPMF FourCC to extract unlisted streams: extract_all_telemetry(path, streams=["MWET"]).

Timestamps

Every TelemetryStream carries two timestamp arrays:

• data — (ms, value) pairs from the GPMF STMP clock (millisecond precision, always available)
• pts_data — (seconds, value) pairs on the video presentation timeline (available when the MP4 has timing atoms)

Use pts_data to align telemetry with video frames.

GPS quality fields

The GPS stream includes two "sticky" metadata fields that persist across samples:

Field	Values	Meaning
fix	0 / 2 / 3	No lock / 2D / 3D
dop	0–9999	Dilution of precision (lower = better)

Filter on fix >= 3 and dop < 500 for reliable positions.

API reference

extract_all_telemetry(video_path, streams=None)

Extract all (or selected) telemetry streams from an MP4 file.

Parameters:

• video_path — path to a GoPro MP4 file
• streams — list of FourCC strings, or None for all default streams

Returns: dict[str, TelemetryStream] — only streams with data are included.

Raises: ValueError if the file has no GPMF metadata track.

TelemetryStream

Attribute	Type	Description
key	str	GPMF FourCC
sample_count	int	Number of readings
name	str	Human-readable name (from STNM)
units	str	SI unit string (from SIUN)
data	list[tuple[int, Any]]	(timestamp_ms, value)
pts_data	list[tuple[float, Any]] | None	(pts_seconds, value)

get_stream_data(f, samples, stream_key, scale=True, time_base=None)

Low-level extraction of a single stream from an open file handle. Use this when you need control over file I/O or want to extract non-standard streams.

Attribution

Core MP4 box walking and GPMF binary parsing adapted from gopro-video-sync by Ethan Vo (MIT).

License

MIT