 Initially streaming starting in 2007 solely using Microsoft technologies and codecs such as VC-1 for video and Windows Media Audio (WMA) for audio, the rapid expansion and diversity of Netflix-capable devices have necessitated encoding into many different formats – including H.264 (AVC), VC-1, H.263 and H.265 (HEVC) for video, and Dolby Digital, Dolby Digital Plus, Advanced Audio Coding (AAC) and Ogg Vorbis for audio.According to Netflix, the vast number of codec and bitrate combinations can mean having to encode the same title 120 different times before it can be delivered to all streaming platforms., the most common video coding format used in Netflix is the discrete cosine transform (DCT) based Advanced Video Coding (AVC), also known as the H.264 format, as it is the most widely supported format in web browsers, televisions, mobile devices, and other consumer devices.