Sembiance: samples

2025-05-14T15:47:13Z

samples

← Older revision		Revision as of 08:47, 14 May 2025
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	* Company: Caiman		* Company: Caiman
	* Extension: MXV		* Extension: MXV
			* Samples: {{DexvertSamples\|video/yoMatiasMXV}}

	This is a format used for music and video in (Argentinian?) kid-oriented games by Caiman. There are two versions of the format, the older one stores LZ-compressed video and PCM audio, newer version has slightly different format and employs Vorbis audio.		This is a format used for music and video in (Argentinian?) kid-oriented games by Caiman. There are two versions of the format, the older one stores LZ-compressed video and PCM audio, newer version has slightly different format and employs Vorbis audio.

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2025-03-15T13:59:19Z

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* Company: Caiman
* Extension: MXV

This is a format used for music and video in (Argentinian?) kid-oriented games by Caiman. There are two versions of the format, the older one stores LZ-compressed video and PCM audio, newer version has slightly different format and employs Vorbis audio.

== Old format ==

Header:
13 bytes - 'Archivo MXV.\x1A"
4 bytes - number of video frames (0 for audio-only files)
2 bytes - width
2 bytes - height
1 byte - bits per pixel (8-24)
2 bytes - frames per second
4 bytes - number of audio frames
2 bytes - sampling rate
1 byte - bits per audio sample
1 byte - number of audio channels
1 byte - unknown

If video frames are present, it is followed by the table with the following structure of records:
4 bytes - data offset
4 bytes - compressed data size
4 bytes - unpacked data size
4 bytes - timestamp
1 byte - flags

If audio frames are present, there are 32-bit offsets to audio data present right after the header and video frame data (if present). Audio chunks always contain 1 second of PCM audio so storing size is unnecessary.

Video frames are stored as optional palette (signalled by bit 0 of the flags) followed by image data which may be optionally compressed (bit 1 of the flag signals deflate being used on the data, bit 2 of the flags tells that it's custom LZW compression scheme).

== New format ==
Here "Archivo MXV.\x1A" is followed by chunks with various kinds of data:
* <code>FHDR</code> -- actual header (video and audio parameters, the format is similar to the old version)
* <code>VTBL</code> -- video frame table (32-bit offset, compressed size, timestamp and flags)
* <code>ATBL</code> -- audio table (now with 32-bit offset and size for each frame)
* <code>AHDR</code> -- Vorbis headers
* <code>DATA</code> -- actual video and audio data (with offsets being relative to its start)

Video data compression seems to still employ deflate on raw images and some additional method for interframes.

[[Category:Game Formats]]

MXV - Revision history

Sembiance: samples

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