Sorry about the long-winded title here, but I thought that this may be of help to some folks authoring hybrid DVD-A discs. VIDEO_TS Restrictions for Video Links When a VIDEO_TS is used for a Video, the following restrictions should be observed for the contents of the VIDEO_TS: VMG (Video Manager) The Video Manager is used when the disc is played in a DVD-Video player. The following VMG restrictions should be observed: • No Region Management. • No Parental Management. • Text Data Manager should not be specified. VTS (Video Title Set) VTS titles shall be linked from the DVD-Audio playlist. A Video Title may be specified in conjunction with an Audio Title for a playlist item. In this case, the Video Title will be played on video-capable players, and the Audio Title will be played on audio-only players (e.g. portable or car players). If only a Video Title is specified for a playlist item, the title will only be accessible from a video-capable player. The Video Title (and VTS to which it belongs) should observe the following restrictions: • A Title shall consist of one Program Chain (PGC), and should not be a PGC Block. The Title shall be set for Sequential playback. • Pre-Command, Post-Command, and Cell-Command shall not be specified, except for the “CallSS from TT_DOM (title domain) to VMGM_DOM (vmg domain)” in the Post-Command area. This command will only used by DVD-Video players, and ignored by DVD-Audio players. • Availability control of User Operations, Audio Streams, and Sub-picture Streams should not be specified. These features will always be available. • Cell Stills and VOBU Stills shall not be defined. • Number of audio streams shall be 1 or 2, with one stream being Linear PCM or AC-3 (if playlist title only consists of Video Title). • Cell blocks (e.g. different Angles) may be specified if the playlist title consists of only the Video Title. • Some Button Commands are restricted. The available commands for a Video Title are LinkPGCN, LinkCN, LinkSIns(PG, C), COMP_LinkPGN, COMP_LinkCN, COMP_LinkSIns(PG, C), SetSTN, Set, COMP_SetSTN, SetSTN_LinkPGN, SetSTN_LinkCN, SetSTN_LinkSIns(PG, C), Set_LinkPGN, Set_LinkCN, Set_LinkSIns(PG, C) • The Navigation Timer should not be used. Any questions.....