Microsoft Screen Codec: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
(may it be less undiscovered codec) |
||
Line 7: | Line 7: | ||
MSA1 is created by Live Meeting 2007 | MSA1 is created by Live Meeting 2007 | ||
== Some details about format == | |||
Both MSS1 and MSS2 are quite close (thus are decoded with single decoder). They employ arithmetic coding - real one, with probability coding. This coding is used with several adaptive models, which look a bit like PPM. | |||
=== Extradata format === | |||
(for some reason, data in .wmv is stored in big-endian order) | |||
4- 7 header length | |||
8-11 major version | |||
12-15 minor version | |||
16-19 display width | |||
20-23 display height | |||
24-27 coded width | |||
28-31 coded height | |||
32-35 frames per second (float) | |||
36-39 bitrate | |||
40-43 max lead time (float) | |||
44-47 max lag time | |||
48-51 max seek time | |||
52-55 nFreeColors | |||
56-... palette (256 RGB triplets) | |||
[[Category:Video Codecs]] | [[Category:Video Codecs]] | ||
[[Category:Screen Capture Video Codecs]] | [[Category:Screen Capture Video Codecs]] | ||
[[Category:Undiscovered Video Codecs]] | [[Category:Undiscovered Video Codecs]] |
Revision as of 10:05, 13 June 2009
Also known as Windows Media Screen Codec.
- FourCCs: MSS1, MSS2, MSA1
- Samples:
MSA1 is created by Live Meeting 2007
Some details about format
Both MSS1 and MSS2 are quite close (thus are decoded with single decoder). They employ arithmetic coding - real one, with probability coding. This coding is used with several adaptive models, which look a bit like PPM.
Extradata format
(for some reason, data in .wmv is stored in big-endian order)
4- 7 header length 8-11 major version 12-15 minor version 16-19 display width 20-23 display height 24-27 coded width 28-31 coded height 32-35 frames per second (float) 36-39 bitrate 40-43 max lead time (float) 44-47 max lag time 48-51 max seek time 52-55 nFreeColors 56-... palette (256 RGB triplets)