Recording Ultrawide Displays and High-Resolution Sources
Why ultrawide displays need special handling
Recording an ultrawide monitor (like a 5120×1440 or 3440×1440 screen) produces frames that are much wider than a standard 16:9 display. The H.264 video codec — the one most recording apps default to — has hardware encoder limits that top out around 4096 pixels wide on many Macs. When asked to encode frames beyond that, the encoder silently returns black frames instead of raising an error, which can leave you with a recording that looks like it worked but contains no visible content.
Highlight Studio handles this automatically, and also gives you manual control when you want it.
Automatic codec selection
By default, the app's Codec setting is set to Automatic, which picks the best encoder based on what you're capturing:
- Standard captures (up to ~4K wide) → H.264, maximum playback compatibility.
- Ultrawide or very large captures (above 4096 wide) → HEVC (H.265), which supports up to 8192×4320 cleanly on Apple Silicon.
Automatic is the recommended setting for almost everyone. It uses H.264 when it's safe and HEVC only when necessary, so files stay as compatible as possible without ever producing black frames.
Changing the codec manually
Open the Record window and look for the Codec menu under Quality. You'll see three options:
- Automatic (default) — picks the best codec based on resolution.
- H.264 — forces H.264 regardless of source size. Widest playback compatibility (every Mac, iOS device, Windows PC, and browser plays it without issue). May produce black frames on very large sources.
- HEVC (H.265) — forces HEVC. Required for ultrawide and 4K+ captures. Produces smaller files than H.264 at the same quality, but some older devices and some video editors don't play HEVC files.
Ultrawide and high-resolution warning
When you select a source whose dimensions would exceed the H.264 safe limit, Highlight Studio shows an orange banner right in the Record window:
- With Automatic or HEVC selected: "HEVC will be used to avoid black-frame issues at this resolution."
- With H.264 forced: "H.264 may produce black frames at this resolution. HEVC is strongly recommended."
This gives you a clear heads-up before you start a long recording.
Resolution clamping
Even on HEVC, extremely large captures (like a 5120×1440 ultrawide at Ultra quality) can exceed hardware encoder limits. Highlight Studio automatically clamps capture dimensions to a safe maximum of 7680 pixels on either axis, scaling proportionally to preserve your source's aspect ratio. Your recording will still look correct — just at the highest resolution your Mac can actually encode smoothly.
Cropping as an alternative
If you record a full ultrawide but only need a 16:9 region for your final video, you don't have to re-record. Use the Crop button in the editor's video controls bar to select a rectangular region — the exported video will contain only that region, at full resolution.
See Cropping Your Video in the Editor for details.
Playback compatibility notes
- H.264 plays in every modern video player, browser, and operating system.
- HEVC plays natively on macOS 10.13+ and iOS 11+. Windows requires the free HEVC Video Extensions from Microsoft Store. Most modern browsers and editors (Premiere, Final Cut, DaVinci Resolve) support HEVC.
- If you're publishing to YouTube or similar, both codecs are re-encoded server-side, so either works identically for viewers.
When to use each setting
| Situation | Recommended setting |
|---|---|
| Standard display (up to ~4K) | Automatic (uses H.264) |
| Ultrawide (3440×1440 and up) | Automatic (uses HEVC) |
| Super-ultrawide (5120×1440) | Automatic (uses HEVC, dimensions clamped) |
| Sharing file with someone on old Windows | Force H.264 |
| Minimum file size | Force HEVC |
| Importing into older editor that can't read HEVC | Force H.264 |
Troubleshooting
My recording is all black. Stop the recording, switch codec to Automatic or HEVC (H.265), and try again. Highlight Studio also runs a preflight check at the start of every recording — if it detects black frames, it will show an alert within about a second so you don't record 20 minutes of nothing.
My recording works but plays back choppy. The encoder may be struggling with the resolution. Lower the quality setting (e.g. Ultra → 1080p) or crop the source in the editor afterward.
Exported HEVC file won't open on Windows. Install the free HEVC Video Extensions from the Microsoft Store, or switch to H.264 for this export.