You hit the hotkey, talked for an hour, and stopped. Then you opened the recordings folder and found nothing, or a file that won’t play. On a single MacBook screen this is easy to do, because OBS is hidden behind the app you’re presenting the whole time.
Why recordings go missing
Almost every lost session comes down to one of these:
- The wrong button. Start Streaming and Start Recording sit next to each other in the Controls dock.
- A hotkey that didn’t fire. On macOS, OBS can only catch hotkeys while another app is in front if it has Accessibility permission.
- A forgotten pause. You paused during a break and never resumed.
- A full disk. OBS stops recording when the drive fills up, and nothing on screen tells you.
- A crash during an MP4 recording. A classic MP4 file is only finished when the recording stops cleanly. If OBS or your Mac crashes first, the file is often unreadable.
Where OBS shows recording status on macOS
- The status bar at the bottom of the OBS window shows a recording indicator and the elapsed time. It’s the most reliable signal, but only while you can see the OBS window.
- The Controls dock. Start Recording changes to Stop Recording while a recording runs, and a pause button appears next to it.
- The menu bar icon. If Settings → General → System Tray is enabled, OBS adds an icon to the macOS menu bar that changes while it records or streams. Most full-screen apps and games hide the menu bar.
None of these come to you. You have to remember to look, at the right moment, at a window you can’t see.
Set OBS up so one slip costs less
- Use a crash-resilient format. In Settings → Output → Recording, set Recording Format to Hybrid MP4 (OBS 30.2 and later) or MKV. Both stay readable if the recording is cut short. With MKV, turn on Settings → Advanced → Recording → Automatically remux to MP4 to get an MP4 copy when you stop.
- Check the recording path. Make sure it points at a drive with room for the whole session. A quick estimate: GB per hour ≈ bitrate in Mb/s × 0.45. A 20 Mb/s recording uses about 9 GB an hour; 50 Mb/s uses about 22 GB.
- Give recording its own hotkey. Set one in Settings → Hotkeys that no other app uses, then allow OBS in System Settings → Privacy & Security → Accessibility so it works while OBS is in the background.
- Record every stream automatically. If you stream, turn on Settings → General → Output → Automatically record when streaming. You always get a local copy, even when you meant to press the other button.
- Split long recordings. In Advanced output mode, Automatic File Splitting starts a new file every so often, so a problem late in a session doesn’t take the whole thing with it.
A 30-second check before you start
- The timer in the OBS status bar is moving.
- Your mic meter moves when you speak.
- The preview shows the right display or window, not a black frame.
- There’s enough free space for the whole session.
- Your Mac is on power and Low Power Mode is off.
- A Focus is on, so notifications stay out of the shot.
For an important session, stop after a minute and play the file back. It catches a silent mic or a black display capture before you lose an hour to it.
If OBS crashed mid-recording
- Hybrid MP4 or MKV: the file should play up to the moment of the crash. If you want a regular MP4, use File → Remux Recordings.
- Classic MP4: the file may not open at all. Third-party repair tools can sometimes rebuild it from a healthy recording made with the same settings, but there’s no guarantee. Switch formats so it doesn’t happen again.
Keep the status in view
On an external display or a Mac without a notch, StreamNotch shows the same status in a floating pill at the top of the screen.