DVR-MS - Revision history

Gamester17 at 18:44, 25 September 2008

2008-09-25T18:44:49Z

← Older revision		Revision as of 11:44, 25 September 2008
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	* The audio stream header in a DVR-MS file is stored in the header extension object rather than a standard stream header object. The [[GUID]] for the audio stream has never been published by Microsoft and this has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing DVR-MS files.		* The audio stream header in a DVR-MS file is stored in the header extension object rather than a standard stream header object. The [[GUID]] for the audio stream has never been published by Microsoft and this has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing DVR-MS files.

			== Phasing out of DVR-MS ==
			Starting with [[Windows Media Center TV Pack 2008]] and moving forward Microsoft has indicated that DVR-MS is being replaced with [[WTV]].<ref>[http://arstechnica.com/journals/microsoft.ars/2008/07/18/fiji-beta-over-windows-media-center-tv-pack-2008-hits-rtm Fiji beta over, Windows Media Center TV Pack 2008 hits RTM]</ref><ref>[http://blogs.zdnet.com/microsoft/?p=1489 Microsoft Fiji beta over; final ‘TV Pack’ due soon]</ref>

			==References==
			<references/>


	[[Category:Container Formats]]		[[Category:Container Formats]]

Johnfdonaghy: improved readability, added bullet points, moved some text around

2006-05-04T15:27:13Z

improved readability, added bullet points, moved some text around

← Older revision		Revision as of 08:27, 4 May 2006
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	DVR-MS is the format used to record television shows in [[Microsoft]] Windows XP Media Center Edition. The format is based on the [[ASF]] specification. The video codec used is [[MPEG-2]] and the audio codec is normally [[MP2]] although it can be [[AC3]] for HDTV depending on how the signal is broadcast.		DVR-MS is the format used to record television shows in [[Microsoft]] Windows XP Media Center Edition. The format is based on the [[ASF]] specification. The video codec used is [[MPEG-2]] and the audio codec is normally [[MP2]] although it can be [[AC3]] for HDTV depending on how the signal is broadcast. The format is also currently used by MediaPortal to record television shows.

	DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)		DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)
Line 5:		Line 5:
	While DVR-MS files do conform to the ASF specification there are are some unusual features that are not publicly documented. In particular the following are of note:		While DVR-MS files do conform to the ASF specification there are are some unusual features that are not publicly documented. In particular the following are of note:

	- Unlike in ASF files the change of the media object number ~~in a~~ sub-~~packet~~ does not imply that the ~~video~~ frame ~~is now complete~~. The only way to detect the end of the video frame is to use a codec-specific process to analize the stream ~~and determine when a compete video frame has been read~~.		* Unlike in regular ASF files, the change of the media object number between video stream sub-packets does not imply that the frame has been completely read. The only way to detect the end of the video frame is to use a codec-specific process to analize the stream.

	- All frames in a DVR-MS file are marked as keyframes which makes it impossible to write correct stream-seeking functions without resorting to codec specific code.		* All frames in a DVR-MS file are marked as keyframes which makes it impossible to write correct stream-seeking functions without resorting to codec specific code.

	- The audio stream header in a DVR-MS file is stored in the header extension object rather than a standard stream header object. The [[GUID]] for the audio stream has never been published by Microsoft ~~which~~ has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing DVR-MS files.		* The audio stream header in a DVR-MS file is stored in the header extension object rather than a standard stream header object. The [[GUID]] for the audio stream has never been published by Microsoft and this has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing DVR-MS files.

	~~The DVR-MS format is also currently used by MediaPortal to record television shows~~.

	[[Category:Container Formats]]		[[Category:Container Formats]]

DonDiego: link syntax fix

2006-05-02T22:34:29Z

link syntax fix

← Older revision		Revision as of 15:34, 2 May 2006
Line 1:		Line 1:
	DVR-MS is the format used to record television shows in [[Microsoft]] Windows XP Media Center Edition. The format is based on the [[ASF]] specification. The video codec used is [[MPEG-2]] and the audio codec is normally [[MP2]] although it can be [[AC3 ]]for HDTV depending on how the signal is broadcast.		DVR-MS is the format used to record television shows in [[Microsoft]] Windows XP Media Center Edition. The format is based on the [[ASF]] specification. The video codec used is [[MPEG-2]] and the audio codec is normally [[MP2]] although it can be [[AC3]] for HDTV depending on how the signal is broadcast.

	DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)		DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)

DonDiego: Dvr-ms moved to DVR-MS: consistent uppercase spelling

2006-05-02T22:33:56Z

Dvr-ms moved to DVR-MS: consistent uppercase spelling

← Older revision	Revision as of 15:33, 2 May 2006
(No difference)

DonDiego: wikify

2006-05-02T22:32:21Z

wikify

← Older revision		Revision as of 15:32, 2 May 2006
Line 1:		Line 1:
	DVR-MS is the format used to record television shows in Microsoft Windows XP Media Center Edition. The format is based on the ASF specification. The video codec used is ~~MPEG2~~ and the audio codec is normally MP2 although it can be AC3 for HDTV depending on how the signal is broadcast.		DVR-MS is the format used to record television shows in [[Microsoft]] Windows XP Media Center Edition. The format is based on the [[ASF]] specification. The video codec used is [[MPEG-2]] and the audio codec is normally [[MP2]] although it can be [[AC3 ]]for HDTV depending on how the signal is broadcast.

	DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)		DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)
Line 5:		Line 5:
	While DVR-MS files do conform to the ASF specification there are are some unusual features that are not publicly documented. In particular the following are of note:		While DVR-MS files do conform to the ASF specification there are are some unusual features that are not publicly documented. In particular the following are of note:

	- Unlike in ~~WMV~~ files the change of the media object number in a sub-packet does not imply that the video frame is now complete. The only way to detect the end of the video frame is to use a codec-specific process to analize the stream and determine when a compete video frame has been read.		- Unlike in ASF files the change of the media object number in a sub-packet does not imply that the video frame is now complete. The only way to detect the end of the video frame is to use a codec-specific process to analize the stream and determine when a compete video frame has been read.

	- All frames in a DVR-MS file are marked as keyframes which makes it impossible to write correct stream-seeking functions without resorting to codec specific code.		- All frames in a DVR-MS file are marked as keyframes which makes it impossible to write correct stream-seeking functions without resorting to codec specific code.

	- The audio stream header in a DVR-MS file is stored in the header extension object rather than a standard stream header object. The GUID for the audio stream has never been published by Microsoft which has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing DVR-MS files.		- The audio stream header in a DVR-MS file is stored in the header extension object rather than a standard stream header object. The [[GUID]] for the audio stream has never been published by Microsoft which has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing DVR-MS files.

	The DVR-MS format is also currently used by MediaPortal to record television shows.		The DVR-MS format is also currently used by MediaPortal to record television shows.

			[[Category:Container Formats]]

Johnfdonaghy at 22:27, 2 May 2006

2006-05-02T22:27:39Z

← Older revision		Revision as of 15:27, 2 May 2006
Line 1:		Line 1:
	DVR-MS is the format used to record television shows in Microsoft Windows XP Media Center Edition. The format is based on the ASF specification. The video codec used is MPEG2 and the audio codec is normally MP2 although it can be AC3 for ~~HTTV~~ depending on how the signal is broadcast.		DVR-MS is the format used to record television shows in Microsoft Windows XP Media Center Edition. The format is based on the ASF specification. The video codec used is MPEG2 and the audio codec is normally MP2 although it can be AC3 for HDTV depending on how the signal is broadcast.

	DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)		DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)

DonDiego: consistent spelling for DVR-MS

2006-05-02T22:16:09Z

consistent spelling for DVR-MS

← Older revision		Revision as of 15:16, 2 May 2006
Line 7:		Line 7:
	- Unlike in WMV files the change of the media object number in a sub-packet does not imply that the video frame is now complete. The only way to detect the end of the video frame is to use a codec-specific process to analize the stream and determine when a compete video frame has been read.		- Unlike in WMV files the change of the media object number in a sub-packet does not imply that the video frame is now complete. The only way to detect the end of the video frame is to use a codec-specific process to analize the stream and determine when a compete video frame has been read.

	- All frames in a ~~dvr~~-ms file are marked as keyframes which makes it impossible to write correct stream-seeking functions without resorting to codec specific code.		- All frames in a DVR-MS file are marked as keyframes which makes it impossible to write correct stream-seeking functions without resorting to codec specific code.

	- The audio stream header in a ~~dvr~~-ms file is stored in the header extension object rather than a standard stream header object. The GUID for the audio stream has never been published by Microsoft which has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing ~~dvr~~-ms files.		- The audio stream header in a DVR-MS file is stored in the header extension object rather than a standard stream header object. The GUID for the audio stream has never been published by Microsoft which has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing DVR-MS files.

	The DVR-MS format is also currently used by MediaPortal to record television shows.		The DVR-MS format is also currently used by MediaPortal to record television shows.

DonDiego: typo fixes

2006-05-02T22:13:35Z

typo fixes

← Older revision		Revision as of 15:13, 2 May 2006
Line 1:		Line 1:
	DVR-MS is the format used to record television shows in Microsoft Windows XP Media Center Edition. The format is based on the ASF specification. The video codec used is MPEG2 and the audio codec is normally MP2 although it can be AC3 for HTTV depending on how the signal is broadcast.		DVR-MS is the format used to record television shows in Microsoft Windows XP Media Center Edition. The format is based on the ASF specification. The video codec used is MPEG2 and the audio codec is normally MP2 although it can be AC3 for HTTV depending on how the signal is broadcast.

	DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM enabled files provided they have been upgraded to the latest firmware.)		DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM-enabled files provided they have been upgraded to the latest firmware.)

	While DVR-MS files do conform to the ASF specification there are are some unusual features that are not publicly documented. In particular the following are of note:		While DVR-MS files do conform to the ASF specification there are are some unusual features that are not publicly documented. In particular the following are of note:

	- Unlike in WMV files the change of the media object number in a sub-packet does not imply that the video frame is now complete. The only way to detect the end of the video frame is to use a codec-specific process to ~~analise~~ the stream and determine when a compete video frame has been read.		- Unlike in WMV files the change of the media object number in a sub-packet does not imply that the video frame is now complete. The only way to detect the end of the video frame is to use a codec-specific process to analize the stream and determine when a compete video frame has been read.

	- All frames in a dvr-ms file are marked as ~~key frames~~ which makes it impossible to write correct stream seeking functions without resorting to codec specific code.		- All frames in a dvr-ms file are marked as keyframes which makes it impossible to write correct stream-seeking functions without resorting to codec specific code.

	- The audio stream header in a dvr-ms file is stored in the header extension object rather than a standard stream header object. The GUID for the audio stream has never been published by Microsoft which has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing dvr-ms files.		- The audio stream header in a dvr-ms file is stored in the header extension object rather than a standard stream header object. The GUID for the audio stream has never been published by Microsoft which has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing dvr-ms files.

	The DVR-MS format is also currently used by MediaPortal to record television shows.		The DVR-MS format is also currently used by MediaPortal to record television shows.

	--

Johnfdonaghy at 20:08, 2 May 2006

2006-05-02T20:08:38Z

New page

DVR-MS is the format used to record television shows in Microsoft Windows XP Media Center Edition. The format is based on the ASF specification. The video codec used is MPEG2 and the audio codec is normally MP2 although it can be AC3 for HTTV depending on how the signal is broadcast.

DVR-MS files have built-in support for DRM which is added to the recording if the broadcast stream is marked as copy protected. In such cases the recording can only be played back on the device it is recorded on. (An exception to this is that hardware based Media Center Extenders can play back DRM enabled files provided they have been upgraded to the latest firmware.)

While DVR-MS files do conform to the ASF specification there are are some unusual features that are not publicly documented. In particular the following are of note:

- Unlike in WMV files the change of the media object number in a sub-packet does not imply that the video frame is now complete. The only way to detect the end of the video frame is to use a codec-specific process to analise the stream and determine when a compete video frame has been read.

- All frames in a dvr-ms file are marked as key frames which makes it impossible to write correct stream seeking functions without resorting to codec specific code.

- The audio stream header in a dvr-ms file is stored in the header extension object rather than a standard stream header object. The GUID for the audio stream has never been published by Microsoft which has made it difficult for open source programs to correctly play the format. However the GUID has now been discovered and several open sources media players are now finally capable of playing dvr-ms files.

The DVR-MS format is also currently used by MediaPortal to record television shows.

--