MJP - Revision history

Multimedia Mike: header info

2008-03-20T16:07:54Z

header info

← Older revision		Revision as of 09:07, 20 March 2008
Line 1:		Line 1:
			* Extension: ptx
			* Company: VTech
			* Samples: http://samples.mplayerhq.hu/game-formats/vdisc/

	This movie container format is used by ''The Amazing Spider-Man: Countdown To Doom'' game for the [[VTech V.Flash]] Game Console and possibly other games for the same system.		This movie container format is used by ''The Amazing Spider-Man: Countdown To Doom'' game for the [[VTech V.Flash]] Game Console and possibly other games for the same system.

DonDiego: Add to Game formats category.

2007-04-29T22:22:00Z

Add to Game formats category.

← Older revision		Revision as of 15:22, 29 April 2007
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	* The compressed video frames seem to be a modified byteswapped version of the JFIF 1.01 JPEG standard. Decompression with out-of-the-box JPEG codecs fails though.		* The compressed video frames seem to be a modified byteswapped version of the JFIF 1.01 JPEG standard. Decompression with out-of-the-box JPEG codecs fails though.

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

Ivo: add to container formats category

2007-04-29T17:00:28Z

add to container formats category

← Older revision		Revision as of 10:00, 29 April 2007
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	** little-endian		** little-endian
	* The compressed video frames seem to be a modified byteswapped version of the JFIF 1.01 JPEG standard. Decompression with out-of-the-box JPEG codecs fails though.		* The compressed video frames seem to be a modified byteswapped version of the JFIF 1.01 JPEG standard. Decompression with out-of-the-box JPEG codecs fails though.

			[[Category: Container Formats]]

Ivo: typo

2007-04-29T16:59:47Z

typo

← Older revision		Revision as of 09:59, 29 April 2007
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	** mono		** mono
	** little-endian		** little-endian
	* The compressed video frames seem to be a modified byteswapped version of the JFIF 1.01 JPEG standard. Decompression with out-of-the-box JPEG codecs ~~fail~~ though.		* The compressed video frames seem to be a modified byteswapped version of the JFIF 1.01 JPEG standard. Decompression with out-of-the-box JPEG codecs fails though.

Ivo at 16:58, 29 April 2007

2007-04-29T16:58:45Z

New page

This movie container format is used by ''The Amazing Spider-Man: Countdown To Doom'' game for the [[VTech V.Flash]] Game Console and possibly other games for the same system.

Files start with a global header, followed by several chunks.

typedef struct mjp_header_s {
uint32_t fourcc; // 'MIAV'
uint32_t header_size; // 0x40 (64) for all sample files
uint64_t data_size; // equals file_size - header_size
uint32_t duration; // number of frames per stream
uint16_t fps;
uint16_t unknown0; // always 0x05
uint16_t width;
uint16_t height;
uint8_t unknown1[36]; // reserved? all zeroes
} mjp_header_t;

Each chunk starts with a small header.

typedef struct chunk_header_s {
uint32_t id; // '00dc' '01wb' '02wb'
uint32_t dts; // timebase = 1/fps
uint32_t payload_size; // number of bytes that ''follow'' this chunk_header
} chunk_header_t;

Notes:

* The chunk's id denotes to which stream it belongs ('00', '01', '02') and what type of data it contains, similar to AVI files:
** dc - compressed video frame
** wb - audio data
* There seems to be no header field telling us how many streams there are. All sample files contain three streams:
** 00 - video
** 01 - audio
** 02 - audio
* All audio chunks are 1470 bytes in size. At a framerate of 15 fps and after analyzing the audio data, it seems to have the following charactaristics:
** 11025 Hz
** mono
** little-endian
* The compressed video frames seem to be a modified byteswapped version of the JFIF 1.01 JPEG standard. Decompression with out-of-the-box JPEG codecs fail though.