Formats & playback 5 min read
iPhone MOV Files That Will Not Open on Windows or Android: Causes and Fixes
Since iOS 11, iPhones default to "High Efficiency" mode: HEVC video inside a MOV container. The file is fine — the players are the problem. Two fixes exist, and one of them is instant.
Cause and the two fixes
- Cause: HEVC (H.265) video — Windows 10 without the paid codec pack, older Androids, and many smart TVs cannot decode it.
- Fix 1 (instant, lossless): remux MOV → MP4. The HEVC stream is copied untouched. Playback now depends on HEVC support alone — better, not universal.
- Fix 2 (compatible): transcode to H.264 + AAC in an MP4. Plays on literally anything. Costs one encode generation, imperceptible at CRF 20.
Prevention
On the iPhone: Settings → Camera → Formats → "Most Compatible" makes future recordings H.264. Storage cost is real but compatibility pain disappears. For mixed-device teams, H.264 remains the lingua franca.