The DVD-VR standard defines a logical format for video recording on DVD-R, DVD-RW, and DVD-RAM style media, including the dual layer versions of these media. As opposed to media recorded with the DVD+VR recording standard, the resulting media are not DVD-Video compliant, and do not play back in some DVD-Video players. Most DVD video recorders in the market that support DVD-R, DVD-RW, or DVD-RAM media record to these media in DVD-VR mode, as well as in a DVD-Video compliant mode. It is possible to use the DVD-VR format with DVD+R and DVD+RW media, but no examples are known other than some PC based recording utilities. The standard was introduced in 1999 by the DVD Forum, and licensing is managed by the DVD Format/Logo Licensing Corporation. For each of the supported media, the full recording standard consists of three parts being: Physical Specifications (Part 1), File System Specifications (Part 2), and the Video Recording Specifications (Part 3). Feature overview The DVD-VR specification allows implementing the following main features: Video recording to DVD-R, DVD-RW, and DVD-RAM. Newer versions of the standard have been extended to also allow recording to DVD-R Dual Layer media. Up to 99 titles per disc. Multiple play lists defining different playback-paths of the recorded content. Adding chapters and bookmarks to a recording. Support Main/Sub language for recording bilingual broadcasting. Frame-accurate editing of recorded content: Title split, title delete, partial title delete. Fragmented recording: All unused space on the disc may be randomly added to new recordings. This is the opposite of the tape-model used by DVD+VR recorders. Video and data files (such as digital pictures, or MP3 files) may be mixed on a single disc. Multiple recording modes, up to 10.08 megabit per second (DVD-Video quality). Title and disc protection. 16:9 and 4:3 material may be mixed within a single file with the display switching correctly (where supported). DVD-VR recorded media are not DVD-Video compliant, and do not play back in all DVD players. Some more recent DVD players, and also the Sony PlayStation 2, can play discs recorded in the DVD-VR format. Technical format overview The DVD-VR standard defines a logical format for recording and editing of video on a DVD disc. Instead of modifying the DVD-Video standard, a separate standard was created to allow for this. Video is recorded as an MPEG program stream. Video resolution depends on the recording quality and the video format used.