Files on the card

All recordings go in the Trinet folder on the memory card. A recording is a set of files — keep them together.

File	Contains
.mp4	The video (and audio on cameras with microphones). It also carries the camera's identity, calibration and a copy of the motion and timing data.
.imu	Motion data: accelerometer, gyroscope and magnetometer samples with timestamps.
.vts	One timestamp per video frame, on the same clock as the motion data.
.json	A small, human-readable summary of the recording: session and kit IDs, this camera's role and device ID.

The .imu and .vts files are binary — open them with the Python toolkit or the SDK. Their layout is documented in File formats.

Trinet Mono

Trinet/
├── recording1_1.mp4
├── recording1_1.imu
├── recording1_1.vts
├── recording2_1.mp4
└── …

Files are named recording<session>_<part>. The session number increases with every take. A take normally has one part; a new part is started when recording resumes after a cooling pause (recording3_2, recording3_3, …).

Trinet Stereo and Stereo GS

Trinet/recording/
├── take0001_L.mp4     left eye
├── take0001_R.mp4     right eye
├── take0001_L.vts     left-eye frame timestamps
├── take0001_R.vts     right-eye frame timestamps
├── take0001.imu       motion data
└── …

Left and right are as seen by the wearer. Pair left and right frames by their .vts files, not by frame position in the videos — see Left and right on Trinet Stereo.

While a take is being recorded and saved, a take0001.inprogress file sits next to it and is removed once the take is complete. If one is still there, the take was interrupted — power was lost while recording, or while the light was white — and the camera repairs the take automatically the next time it starts with that card (see Inspect and repair). To avoid it, stop the recording and wait for the light to turn green before disconnecting power or removing the card; long recordings take longer to save.

Split recordings

If the camera is set to split recordings — also called chunking — either at the factory or from the app, a long session is saved as a series of numbered takes of that length rather than one very large file:

Trinet/recording/
├── take0001_L.mp4    first 30 minutes
├── take0001_R.mp4
├── take0002_L.mp4    next 30 minutes
└── …

Each take is complete and plays on its own, with its own motion and timing files. Between takes the camera pauses for 10–20 seconds to finish writing the one before — the light stays on, nothing is recorded during the pause, and the next take starts by itself. The take numbers run on, so the order is the order they were recorded in.

Kit recordings

Takes recorded in a Wrist Kit start with a shared kit prefix, grp<session>_<camera>_…, so the files from each camera that belong to the same take are easy to match.

Other files

You may also see a few small files the camera uses for bookkeeping — for example a log written after a cooling pause or an automatic shutdown, a timing-telemetry file (.tel) next to stereo takes, or a temporary marker while a take is in progress. Leave them in place; the toolkit can use them.

Copy the whole folder

When you back up or share recordings, copy the complete Trinet folder (or at least every file with the same name) so video, motion data and timestamps stay together.