It looks like it is in a seperate Avivo package. I think these may be for 10.6 version of CCC. At least their version of it is 10.6:
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Avivo™ Package 29.2 MB 10.6 6/16/2010
Description:
Package Includes:
Encoder
Parental Control
Visual C++ Patch
Avivo Video Converter
Avivo Package Download
or
Download
No mention of 3GP support though, at least on older versions. Changelog for 10.6 doesn't mention any added video formats though:
ATI Avivo Video Converter
ATI has also released a transcoder software dubbed "ATI Avivo Video Converter," which supports transcoding between H.264, VC-1, WMV9, WMV9 PMC, MPEG-2, MPEG-4, DivX video formats, as well as formats used in iPod and PSP. Earlier versions of this software uses only the CPU for transcoding, but have been locked for exclusive use with the ATI X1000 series of GPUs. Software modifications have made it possible to use version 1.12 of converter on a wider range of graphics adapters . The ATI Avivo Video Converter for Windows Vista was available with the release of Catalyst 7.9 (September 2007 release, version 8.411).
The ATI Avivo Video Converter with GPU transcoding acceleration is now also available for use with HD 4800 and HD 4600 series graphics cards and is included with the Catalyst 8.12 drivers. Support for Vista x64 is available via a separate download starting with Catalyst 9.6 (9-6_vista32-64_xcode). The new software is faster than Badaboom, an encoder that uses NVIDIA's CUDA to accelerate encoding, but has a higher CPU utilization than Badaboom. One review reported visual problems with iPod and WMV playback using Catalyst version 8.12, and although concluding there was no clear winner, if forced to choose would go with the Avivo converter.
A Guy