Mobile Video Conferencing

Video Conferencing An Inflection Point

*Apple Facetime 3G only for iOS 6 on iPhone 4S, iPhone 5, new iPad 3, iPad 4, iPad mini, best video quality with hardware DSP acceleration
Google+ Hangouts using Vidyo H.264 SVC
ooVoo comparison
fring Dynamic Video Quality
FriendCaller
*skype SD VP8, HD H264, audio from G.729 to SVOPC to SILK
*Tango
WeChat 微信
Camfrog 
VPHO
VSir 千里眼视频通信
eSky.co

Vidyo Mobile with other vidyo devices, 480x270 encoding, 720p decoding, H264 Scalable Video Coding, Speex wideband audio codec 32kbps

Google Voice no iPad, video chat only on PC, H264
qik video only on certain mobile phones

Video Conferencing on PC

Viber using Spirit DSP no video

Full-HD Voice: Understanding the AAC codecs behind a new era in communication AAC Enhanced Low Delay v2
AAC-ELD > Opus (CELT+SILK) > CELT (ogg, low latency) > G.719 (Polycom) > AAC-LD > SILK (Skype, speech) > G722.2 (AMR-WB) > Speex

Audio/Video Files, Codecs and Containers