It's great to have well-synced audio in AV files, and even better to have a way to shift audio and video sync at playback time to cater for delays in the audio or video path - bluetooth earbuds seem to be very laggy for example. I am hugely grateful to the developers of VLC for providing such a feature. Also grateful to the Mediabunny devs for their care in making encoding sync spot on.

Something vlc can't do!

> Matroska (.webm and .mkv) technically supports negative timestamps up to around -32 seconds, but not every reader supports it (VLC :eyes:).