What does 'Variable Frame Rate Detected' actually mean for an MP4 edit?

Question

My editor flags a phone MP4 as Variable Frame Rate. The clip still plays. Should I convert it immediately, or only if I see a real timing problem?

AVL Editor · Answer

VFR is not automatically broken. Many phones and screen recorders use it intentionally. The real question is whether the editor handles this specific file predictably.

Alex R. · Answer

Watch for symptoms: gradual audio drift, repeated/skipped frames, proxy mismatch, multicam alignment errors or output duration changes. If none appear, conversion may be unnecessary.