Editing DV (video format) (section)

== Digital Interface Format ==
The audio, video, and metadata are packaged into 80-byte Digital Interface Format (DIF) blocks which are multiplexed into a 150-block sequence. DIF blocks are the basic units of DV streams and can be stored as [[computer file]]s in raw form or wrapped in such file formats as [[Audio Video Interleave]] (AVI), [[QuickTime File Format|QuickTime]] (QT) and [[Material Exchange Format]] (MXF).<ref>{{cite web|url=http://www.digitalpreservation.gov/formats/fdd/fdd000173.shtml|title=DV-DIF (Digital Video Digital Interface Format) |work=digitalpreservation.gov |date=26 December 2011 }}</ref><ref>{{cite web|url=http://dvswitch.alioth.debian.org/wiki/DV_format/ |title=DV format |website=Debian.org |access-date=9 November 2009 |archive-url=https://web.archive.org/web/20100107032158/http://dvswitch.alioth.debian.org/wiki/DV_format/ |archive-date=7 January 2010 }}</ref> One video frame is formed from either 10 or 12 such sequences, depending on scanning rate, which results in a data rate of about 25&nbsp;Mbit/s for video, and an additional 1.5&nbsp;Mbit/s for audio. When written to tape, each sequence corresponds to one complete track.<ref name="DVCAM_OVERVIEW" />

Baseline DV employs ''unlocked audio''. This means that the sound may be +/- ⅓ frame out of sync with the video. However, this is the maximum drift of the audio/video synchronization; it is not compounded throughout the recording.