https://wiki.multimedia.cx/index.php?action=history&feed=atom&title=DVCDVC - Revision history2026-04-08T09:19:33ZRevision history for this page on the wikiMediaWiki 1.39.5https://wiki.multimedia.cx/index.php?title=DVC&diff=15871&oldid=prevKostya: fill information2025-03-29T08:10:33Z<p>fill information</p>
<p><b>New page</b></p><div>* Company: [[Q-Team]]<br />
* Extension: dvc<br />
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This is an animation format based on RLE. Quite likely it was the ancestor of [[QPEG]] codec.<br />
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=== Container format ===<br />
Header (all values are little-endian):<br />
6 bytes - "IDVCd\x00"<br />
2 bytes - height<br />
2 bytes - width<br />
2 bytes - unknown<br />
4 bytes - unknown, maybe frame delay in milliseconds<br />
4 bytes - unknown<br />
4 bytes - unknown, looks somewhat like the number of frames but not exactly it<br />
4 bytes - data size<br />
68 bytes - unknown<br />
708 bytes - palette (starting from colour 20)<br />
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Frames start with 16-bit value equal to one (zero means end of file) followed by 32-bit frame size and actual payload.<br />
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=== Video compression ===<br />
Frame data starts with 128-byte remap table (used in literal mode) followed by the opcode stream.<br />
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Opcodes:<br />
* <code>0x00</code> -- skip pixel<br />
* <code>0x01-0x7F</code> -- literal, output pixel value from the remap table using opcode as an index<br />
* <code>0x80</code> -- skip <code>next_byte + 64</code> pixels<br />
* <code>0x81</code> -- skip <code>next_byte + 320</code> pixels<br />
* <code>0x82-0xBF</code> -- skip 2-63 pixels<br />
* <code>0xC0-0xDF</code> -- copy 1-32 pixels from the stream<br />
* <code>0xE0</code> -- end of stream marker<br />
* <code>0xE1-0xFF</code> -- repeat next byte from the stream 2-32 times<br />
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[[Category:Container Formats]]<br />
[[Category:Video Codecs]]</div>Kostya