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This topic applies to Windows Media Player version 6.4 only.
This section outlines features specific to DVD-Video and lists the Windows Media Player control methods that provide these features. These features include the following:
This topic applies to Windows Media Player version 6.4 only.
The Windows Media Player control enables you to seek at several different levels within DVD content. The DVD-Video disc format includes special data for seeking and navigation.
DVD-Video streams consist of .vob files and associated .ifo files that contain information for navigation and data searching, including random access, fast-forward and fast-reverse play, angle switching, and seamless branching. In the case of One_Sequential_PGC_Titles, a time map table enables time-based seeking. For titles not authored in One_Sequential_PGC format, such as those with branching or multiple ratings, time-based seeking is not supported.
In contrast, MPEG-2 files play from the beginning or require access points to be specified as byte offsets into the file to Group of Pictures (GOP) headers. You can access any GOP without prior authoring of entry points, as is required in the case of DVD-Video chapters.
The following table shows the Windows Media Player control DVD-Video methods exposed for seeking at various levels.
Seeking level | Control data | IMediaPlayerDvd Methods |
Title Seeks | Video Title Set (VTS), Title, Program Chain (PGC) | TitlePlay |
Chapter Seeks | Chapter/Part of Title (PTT), Program (PG) | ChapterPlay (specifying title and chapter number), ChapterSearch (search for a chapter within the same title), PrevPGSearch, TopPGSearch, NextPGSearch |
Time Seeks | Interleave Unit (ILVU), Video Object Unit (VOBU) | TimePlay (start playing specified title from specified time), TimeSearch (start playing from specified time within the same title) |
This topic applies to Windows Media Player version 6.4 only.
Subpictures are encoded graphics that can be displayed over the top of the video. The subpicture feature is decoded and alpha blended. The data on the alpha channel could be text for closed captioning, buttons to provide a user interface, menus, subtitles, credits, and so on. Each pixel in a subpicture graphic is encoded with 2 bits, allowing only four colors and four levels of transparency per pixel, chosen from palettes of colors and contrast levels.
Properties relating to the subpicture feature include the following:
The method relating to subpictures is GetSubpictureLanguage.
The event relating to subpictures is EC_DVD_SUBPICTURE_STREAM_CHANGE.
This topic applies to Windows Media Player version 6.4 only.
DVD-Video provides support for up to eight audio tracks to accommodate various languages. DVD-Video also supports text in different languages for statistics related to the DVD title, such as cast, crew, and title. On-screen menus can be displayed in various languages.
Methods relating to language support include the following:
This topic applies to Windows Media Player version 6.4 only.
The Windows Media Player control provides variable speed play, at both faster and slower speeds than normal, through the ForwardScan and BackwardScan methods.
This topic applies to Windows Media Player version 6.4 only.
Consumers can interact with DVD titles by selecting and activating buttons and displaying menus. Buttons can be selected by clicking directly on the video window.
Methods relating to consumer interactivity include the following:
A mouse rollover causes a select, but is prevented from performing a select and activate action. A mouse click is required to activate the button because mouse movement on a PC differs from remote control tabbing on a consumer player.
This topic applies to Windows Media Player version 6.4 only.
DVD-Video supports up to nine camera angles. These angles can be completely independent video streams or different camera angles of the same scene. The fast seeking of the DVD disc enables you to switch angles seamlessly.
Properties relating to video angles include the following:
Events relating to video angles include the following:
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