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Loper · Camera files

Open .SRT files on your Mac.

.SRT

DJI drones write one telemetry cue per frame next to the video. Loper colors ISO, shutter, aperture, GPS and altitude as key/value pairs.

Loper is a free, minimal editor for macOS that opens DJI drone telemetry (.SRT) instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.

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DJI_0042.SRT opened in Loper: DJI drone telemetry (.SRT) with color-coded Subtitles (SRT, VTT, LRC)
Show the file as text
100:00:00,000 --> 00:00:00,033<font size="28">FrameCnt: 1, DiffTime: 33ms2026-10-25 14:32:01.123[iso: 100] [shutter: 1/640.0] [fnum: 1.7] [ev: 0] [ct: 5400][latitude: 47.123456] [longitude: 8.123456] [rel_alt: 52.300 abs_alt: 512.500] </font> 200:00:00,033 --> 00:00:00,066<font size="28">FrameCnt: 2, DiffTime: 33ms

How to open .SRT files

  1. Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
  2. Double-click your .SRT file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
  3. Want every .SRT file to open in Loper? Choose Loper › Make Loper the Default Editor….

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