Editing Audio Video Interleave (section)

==DV AVI==

DV AVI is a type of AVI file where the video has been compressed to conform with [[DV (video format)|DV]] standards. There are two types of DV-AVI files:
* Type 1: The multiplexed Audio-Video is kept in its original multiplexing and saved together into the Video section of the AVI file
** Does not waste much space (audio is saved uncompressed, but even uncompressed audio is tiny compared to the video part of DV), but Windows applications based on the [[Video for Windows|VfW]] [[Application programming interface|API]] do not support it.
* Type 2: Like type 1, but audio is also saved as an additional audio stream into the file.
** Supported by VfW applications, at the price of a small increase in file size.

Type 1 is actually the newer of the two types. Microsoft made the "type" designations, and decided to name their older VfW-compatible version "Type 2", which only furthered confusion about the two types. In the late 1990s through early 2000s, most professional-level DV software, including non-linear editing programs, only supported Type 1. One notable exception was [[Adobe Premiere]], which only supported Type 2. High-end [[FireWire]] controllers usually captured to Type 1 only, while "consumer" level controllers usually captured to Type 2 only. Software is and was available for converting Type 1 AVIs to Type 2, and vice versa, but this is a time-consuming process.

Many FireWire controllers only captured to one or the other type. However, almost all relevant software supports both Type 1 and Type 2 editing and rendering, including Adobe Premiere. Thus, many users are unaware of the fact that there are two types of DV AVI files.