Difference between revisions of "GoToMeeting Codec"

From MultimediaWiki
Jump to navigation Jump to search
m
(G2M2 samples; surface details about the G2M2 variant)
Line 1: Line 1:
 
* FourCC: G2M2, G2M3
 
* FourCC: G2M2, G2M3
 
* Company: [http://www.gotomeeting.com GoToMeeting (Citrix)]
 
* Company: [http://www.gotomeeting.com GoToMeeting (Citrix)]
* Samples: (none available)
+
* Samples:  
 +
** G2M2: http://samples.mplayerhq.hu/V-codecs/G2M2/
  
 +
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/]).
  
Codec used to save recordings in GoToMeeting.  Format is unknown.  FourCC was mentioned in [http://forum.videolan.org/viewtopic.php?t=19941 this thread],      The codec also calls itself GoToWebinar, see [http://www.gotowebinar.com/ http://www.gotowebinar.com/]
+
Win32 binary decoder available here: [http://www.gotomeeting.com/codec 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
  
Win32 binary decoder available here: [http://www.gotomeeting.com/codec http://www.gotomeeting.com/codec]
+
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.
  
 
[[Category:Video Codecs]]
 
[[Category:Video Codecs]]
 
[[Category:Undiscovered Video Codecs]]
 
[[Category:Undiscovered Video Codecs]]
 +
[[Category:Formats missing in FFmpeg]]
 
[[Category:Screen Capture Video Codecs]]
 
[[Category:Screen Capture Video Codecs]]

Revision as of 15:07, 11 January 2009

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.