NXV - Revision history

Compn at 00:19, 18 April 2009

2009-04-18T00:19:08Z

← Older revision		Revision as of 17:19, 17 April 2009
Line 1:		Line 1:
	* Extension: nxv		* Extension: nxv
	* Samples: [http://www.banahogg.com/DIA41.nxv] (see note)		* Samples: [http://www.banahogg.com/DIA41.nxv] (see note) and http://samples.mplayerhq.hu/internets/nxv/

	NXV is a container format used by the 2006 MP4 Player Watch manufactured by "Shenzhen Adragon Digitek" (China). The wrist watch is reported to support MP4, WMV and WMA, however this is achieved by first converting the files to the NXV format.		NXV is a container format used by the 2006 MP4 Player Watch manufactured by "Shenzhen Adragon Digitek" (China). The wrist watch is reported to support MP4, WMV and WMA, however this is achieved by first converting the files to the NXV format.

Ewerness: Explain the meaning of the two special values in the header

2007-02-23T05:26:12Z

Explain the meaning of the two special values in the header

← Older revision		Revision as of 22:26, 22 February 2007
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	The unknown sequence requires a couple of bytes set for playback to work on the watch. The official encoder sets different values for different files, but just using one known sequence seems to work fine. One known good sequence is byte 0x17 = 0x87 and byte 0x87 = 0x02, and 0 for the rest of the values in the block.		The unknown sequence requires a couple of bytes set for playback to work on the watch. The official encoder sets different values for different files, but just using one known sequence seems to work fine. One known good sequence is byte 0x17 = 0x87 and byte 0x87 = 0x02, and 0 for the rest of the values in the block.

			The second value in this sequence is the number of audio buffers between video buffers. The first value appears to be an offset to the second.

	The a/v sequence commences at byte 512 with an audio packet:		The a/v sequence commences at byte 512 with an audio packet:
Line 30:		Line 32:
	curSequence += 1		curSequence += 1
	u8[length] video payload		u8[length] video payload

			Note: This encoding is a superset of what the actual watch supports, but will correctly decode all known NXV files from the encoder. On the watch, the number of audio packets between video packets isn't determined by dynamically detecting a counter but rather by the number in the header. Values of 1, 2, and 4 have been tested (anything larger is too low of a framerate to be interesting for most videos)

	==Audio Payload==		==Audio Payload==

Ewerness: Explain the required values in the bottom pile in the file header

2007-02-20T02:12:48Z

Explain the required values in the bottom pile in the file header

← Older revision		Revision as of 19:12, 19 February 2007
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	byte 21 height (pixels)		byte 21 height (pixels)
	byte 22 always 0		byte 22 always 0
	byte 23 unknown, but required for ~~correct~~ playback on the watch		byte 23-511 unknown but required for playback (see below)
	byte ~~24-511 unknown - rand~~ byte~~? (at least~~ the ~~first few bytes are required for video playback)~~
			The unknown sequence requires a couple of bytes set for playback to work on the watch. The official encoder sets different values for different files, but just using one known sequence seems to work fine. One known good sequence is byte 0x17 = 0x87 and byte 0x87 = 0x02, and 0 for the rest of the values in the block.

	The a/v sequence commences at byte 512 with an audio packet:		The a/v sequence commences at byte 512 with an audio packet:

Ewerness: Document the importants of byte 23

2007-02-20T01:26:52Z

Document the importants of byte 23

← Older revision		Revision as of 18:26, 19 February 2007
Line 13:		Line 13:
	byte 20 width (pixels)		byte 20 width (pixels)
	byte 21 height (pixels)		byte 21 height (pixels)
	byte 22-511 unknown - rand byte? (at least the first few bytes are required for video playback)		byte 22 always 0
			byte 23 unknown, but required for correct playback on the watch
			byte 24-511 unknown - rand byte? (at least the first few bytes are required for video playback)

	The a/v sequence commences at byte 512 with an audio packet:		The a/v sequence commences at byte 512 with an audio packet:

Damion at 00:21, 19 February 2007

2007-02-19T00:21:47Z

← Older revision		Revision as of 17:21, 18 February 2007
Line 13:		Line 13:
	byte 20 width (pixels)		byte 20 width (pixels)
	byte 21 height (pixels)		byte 21 height (pixels)
	byte 22-511 unknown - rand byte?		byte 22-511 unknown - rand byte? (at least the first few bytes are required for video playback)

	The a/v sequence commences at byte 512 with an audio packet:		The a/v sequence commences at byte 512 with an audio packet:
Line 47:		Line 47:
	* [http://forum.doom9.org/showthread.php?t=119616 Related doom9 thread including NXV software download]		* [http://forum.doom9.org/showthread.php?t=119616 Related doom9 thread including NXV software download]
	* [http://www.nxdevice.com/ Vendor website]		* [http://www.nxdevice.com/ Vendor website]
			* [http://trap.me.uk/damion/projects/mp4watch/ UNIX conversion utilities for non Windows users]

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

Chinavasion at 03:54, 1 February 2007

2007-02-01T03:54:25Z

← Older revision		Revision as of 20:54, 31 January 2007
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	* Samples: [http://www.banahogg.com/DIA41.nxv] (see note)		* Samples: [http://www.banahogg.com/DIA41.nxv] (see note)

	NXV is a container format used by the ~~"Brando~~ MP4 Watch" ~~product~~. The wrist watch is reported to support MP4, WMV and WMA, however this is achieved by first converting the files to the NXV format.		NXV is a container format used by the 2006 MP4 Player Watch manufactured by "Shenzhen Adragon Digitek" (China). The wrist watch is reported to support MP4, WMV and WMA, however this is achieved by first converting the files to the NXV format.

	==Container Format==		==Container Format==
Line 42:		Line 42:

	==External Links==		==External Links==
			* [http://www.andalong.com/English/product628.htm China Manufacturer of MP4 Player watch, An Long / "Adragon"]
			* [http://www.chinavasion.com/product_info.php/pName/watch-mp4-player-2gb-15inch-oled-screen Chinavasion - China wholesaler of MP4 Player watch]
	* [http://watch.brando.com.hk/prod_detail.php?prod_id=00100 Brando MP4 Watch Product Page]		* [http://watch.brando.com.hk/prod_detail.php?prod_id=00100 Brando MP4 Watch Product Page]
	* [http://forum.doom9.org/showthread.php?t=119616 Related doom9 thread]		* [http://forum.doom9.org/showthread.php?t=119616 Related doom9 thread including NXV software download]
	* [http://www.nxdevice.com/ Vendor website]		* [http://www.nxdevice.com/ Vendor website]

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

Ewerness: Fix a typo and minor clarifications

2007-01-28T23:32:19Z

Fix a typo and minor clarifications

← Older revision		Revision as of 16:32, 28 January 2007
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	bytes 0-11 ASCIIZ magic ("NXV File")		bytes 0-11 ASCIIZ magic ("NXV File")
	bytes 16-19 ASCIIZ version ("1.0.0", "3.0.1" or "3.0.2")		bytes 12-19 ASCIIZ version ("1.0.0", "3.0.1" or "3.0.2")
	byte 20 width (pixels)		byte 20 width (pixels)
	byte 21 height (pixels)		byte 21 height (pixels)
	byte 22-23 unknown ~~(little endian)~~		byte 22-511 unknown - rand byte?
	~~byte 24~~-~~511~~ rand byte

	The a/v sequence commences at byte 512 with an audio packet:		The a/v sequence commences at byte 512 with an audio packet:

Ewerness at 19:11, 21 January 2007

2007-01-21T19:11:55Z

← Older revision		Revision as of 12:11, 21 January 2007
Line 1:		Line 1:
	* Extension: nxv		* Extension: nxv
	* Samples: ~~tbd~~		* Samples: [http://www.banahogg.com/DIA41.nxv] (see note)

	NXV is a container format used by the "Brando MP4 Watch" product. The wrist watch is reported to support MP4, WMV and WMA, however this is achieved by first converting the files to the NXV format.		NXV is a container format used by the "Brando MP4 Watch" product. The wrist watch is reported to support MP4, WMV and WMA, however this is achieved by first converting the files to the NXV format.

	==Container Format==		==Container Format==
			The format consists of a sequence of 512-bytes packets.

			Header packet:

	bytes 0-11 ASCIIZ magic ("NXV File")		bytes 0-11 ASCIIZ magic ("NXV File")
	bytes 16-19 ASCIIZ version ("1.0.0", "3.0.1" or "3.0.2")		bytes 16-19 ASCIIZ version ("1.0.0", "3.0.1" or "3.0.2")
Line 11:		Line 15:
	byte 22-23 unknown (little endian)		byte 22-23 unknown (little endian)
	byte 24-511 rand byte		byte 24-511 rand byte
	(The a/v sequence commences at byte 512.)
	while eof		The a/v sequence commences at byte 512 with an audio packet:
	u8[~~0x7fc~~] audio payload
			uint curSequence = 0
			while !eof
			u8[500] audio payload
			u8[4] unknown
			be32 sequence number
	le16 length (bytes)		le16 length (bytes)
	le16 unknown		le16 unknown (pixels == bytes/2?)
	u8[length] video payload		if (sequence == curSequence)
			curSequence += 1
			u8[length] video payload

	==Audio Payload==		==Audio Payload==
Line 22:		Line 33:

	==Video Payload==		==Video Payload==
	Raw video~~. 16bpp~~ in 565 RGB format. If the version is "1.0.0", the video is at full-resolution. If the version is "3.0.1", the video is at quarter-resolution. Version "3.0.2" seems to indicate a different format~~, but it is not yet known what that format is~~.		Raw video - be16 in 565 RGB format. If the version is "1.0.0", the video is at full-resolution. If the version is "3.0.1", the video is at quarter-resolution; that is, the video data is 1/4 of the size indicated and is scaled in each direction by two on playback. Version "3.0.2" seems to indicate a different format - likely sixteenth-resolution.

	==Notes==		==Notes==
	* Supported video resolutions are: 96x64, 96x80, 96x96, 128x96, 128x128, 160x128, 176x128. Despite the reduction in video resolution, the resulting NXV file size exceeds that of the input video file.		* Supported video resolutions are: 96x64, 96x80, 96x96, 128x96, 128x128, 160x128, 176x128. Despite the reduction in video resolution, the resulting NXV file size exceeds that of the input video file.
	* Intermediate files are used by the NxvConverter program to store the audio and video payloads (filename.mp3 and filename.tmp) prior to muxing to the NXV file.		* Intermediate files are used by the NxvConverter program to store the audio and video payloads (filename.mp3 and filename.tmp) prior to muxing to the NXV file.
	* ~~Files generated in low~~ and ~~medium~~ quality ~~by NxvConverter~~ have one frame per packet of ~~video payload~~. ~~Files in high quality have variable-size packets with some extra information between frames~~.		* All NXV files examined so far have one frame per video packet and the packets appear at regular intervals. Low and Mid quality have one frame per four audio packets; High quality has one frame for every two audio packets.
			* The content of the sequence and length values in an audio packet not followed by a video packet is unknown - probably nothing.
			* Example file is an encoding of public domain footage from [http://www.archive.org/details/movies Internet Archive: Moving Image Archive]

	==External Links==		==External Links==

MagicalTux at 14:35, 15 January 2007

2007-01-15T14:35:52Z

← Older revision		Revision as of 07:35, 15 January 2007
Line 32:		Line 32:
	* [http://watch.brando.com.hk/prod_detail.php?prod_id=00100 Brando MP4 Watch Product Page]		* [http://watch.brando.com.hk/prod_detail.php?prod_id=00100 Brando MP4 Watch Product Page]
	* [http://forum.doom9.org/showthread.php?t=119616 Related doom9 thread]		* [http://forum.doom9.org/showthread.php?t=119616 Related doom9 thread]
			* [http://www.nxdevice.com/ Vendor website]

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

Ewerness: Fix a typo

2007-01-13T22:12:08Z

Fix a typo

← Older revision		Revision as of 15:12, 13 January 2007
Line 22:		Line 22:

	==Video Payload==		==Video Payload==
	Raw video. 16bpp in 565 RGB format. If the version is "1.0.0", the video is at full-resolution. If the version is "3.0.1", the video is at quarter-resolution. Version "3.0.2" seems to indicate a different format, but it is not yet ~~know~~ what that format is.		Raw video. 16bpp in 565 RGB format. If the version is "1.0.0", the video is at full-resolution. If the version is "3.0.1", the video is at quarter-resolution. Version "3.0.2" seems to indicate a different format, but it is not yet known what that format is.

	==Notes==		==Notes==