ANIME-Distribution and playback:- In the late 1990s and early 2000s, fansubs in electronic form were primarily distributed like VHS and Beta tapes: via mailed CD-Rs. Many fans did not have high speed Internet and were unable to download large files. Many of the early digital fansubs were made from regular tape subs.[ citation needed] In the mid-2000s, most fansubs were distributed through IRC channels, file hosting servicesand BitTorrent. In recent years most groups have shifted from using IRC to being primarily BitTorrent. BitTorrent trackers dedicated to anime fansub releases allow fans to easily find the latest releases, and individual fansub groups often use their own websites to inform fans of new releases. Because of an almost complete de-emphasis on CD-R and DVD-R distribution, file size standards are less frequently followed. An appropriate video and audio playback codec needs to be installed on the computer for proper playback. In addition, many of the video files use alternate multimedia container formats such as OGMand Matroska. Special decoders need to be acquired for these formats as well. One main benefit of using Ogg or Matroska multimedia containers is the ability to create a single file that has DVD-like features such as chapter support and multiple audio and/or subtitle tracks, as well as support for separate opening/ending animation files. At the same time, these multimedia containers can be easily demuxed into their individual files, the individual files can be altered (for example, fixing a misspelling in the subtitles), and then remuxed back together. Many fansub groups recommend using a codec pack, such as CCCP, to allow for relatively simple playback of these formats.