GoToMeeting Codec: Difference between revisions
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(G2M2 samples; surface details about the G2M2 variant) |
(samples surface notes about G2M3) |
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* Samples: | * Samples: | ||
** G2M2: http://samples.mplayerhq.hu/V-codecs/G2M2/ | ** G2M2: http://samples.mplayerhq.hu/V-codecs/G2M2/ | ||
** G2M3: http://samples.mplayerhq.hu/V-codecs/G2M3/ | |||
This is a codec used to save recordings in GoToMeeting. The codec also calls itself GoToWebinar (see [http://www.gotowebinar.com/ http://www.gotowebinar.com/]). | This is a codec used to save recordings in GoToMeeting. The codec also calls itself GoToWebinar (see [http://www.gotowebinar.com/ http://www.gotowebinar.com/]). | ||
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It appears that the minimum size for a G2M2 frame (possibly a no-change frame) is 14 bytes. This includes the 4 signature bytes, a 4-byte length indicating a chunk length of 6, and a 6-byte payload of type 0xCA followed by 5 more bytes. | It appears that the minimum size for a G2M2 frame (possibly a no-change frame) is 14 bytes. This includes the 4 signature bytes, a 4-byte length indicating a chunk length of 6, and a 6-byte payload of type 0xCA followed by 5 more bytes. | ||
G2M3 bears much similarity to G2M2 at the surface level. Naturally, each frame has a signature of 'G2M3'. | |||
[[Category:Video Codecs]] | [[Category:Video Codecs]] |
Revision as of 16:20, 11 January 2009
- FourCC: G2M2, G2M3
- Company: GoToMeeting (Citrix)
- Samples:
This is a codec used to save recordings in GoToMeeting. The codec also calls itself GoToWebinar (see http://www.gotowebinar.com/).
Win32 binary decoder available here: http://www.gotomeeting.com/codec
According to samples, all G2M2 video frames begin with the characters 'G2M2', followed by a series of chunks. Each chunk has the following layout:
bytes 0-3 length of chunk payload, not including this length field byte 4 type of chunk bytes 5.. remainder of payload, format unknown
Observed chunk types include 0xC8, 0xC9, and 0xCA.
It appears that the minimum size for a G2M2 frame (possibly a no-change frame) is 14 bytes. This includes the 4 signature bytes, a 4-byte length indicating a chunk length of 6, and a 6-byte payload of type 0xCA followed by 5 more bytes.
G2M3 bears much similarity to G2M2 at the surface level. Naturally, each frame has a signature of 'G2M3'.