According to research by TrueConf LLC, a leading video-conferencing company, Opus comes first-place as best audio codec for voice transmission over IP.
TrueConf compared five top-end codecs. Each codec was analyzed for quality, speed of encoding and efficiency at different bitrates, and was tested with both male and female voices. Compared to Speex, G.729 and other audio codecs, Opus was found to provide the highest quality audio signal, with excellent efficiency and minimum delay. The ability of Opus to switch promptly between different coding mechanisms allows this codec to be used effectively with different data-transfer rates, as it flexibly adjusts to the changing characteristics of an Internet connection.
One of Europe’s leading developers and vendors of video conferencing solutions, TrueConf believes that Opus is the best codec for transmitting voiceover the Internet and has confirmed that Opus will be the default codec for all of their video-conferencing products. TrueConf has supported Opussince before Skype officially certified it in September.
| Man voice | 16 kbps | 24 kbps | 32 kbps | |||
| Average quality | Speed of coding/encoding, ms | Average quality | Speed of coding/encoding, ms | Average quality | Speed of coding/encoding, ms | |
| SPEEX | 4,0 | 2673 / 382 | 3,75 | 3677 / 354 | 4,5 | 4685 / 303 |
| OPUS | 4,5 | 1310 / 96 | 5,0 | 1406 / 167 | 4,75 | 1364 / 142 |
| G.729.a | 2,75 | 346 / 78 | – | – | – | – |
| G.722.1 | – | – | 4,6 | 26 / 32 | – | – |
| Woman voice | 16 kbps | 24 kbps | 32 kbps | |||
| Average quality | Speed of coding/encoding, ms | Average quality | Speed of coding/encoding, ms | Average quality | Speed of coding/encoding, ms | |
| SPEEX | 3,75 | 5451 / 721 | 4,0 | 5849 / 691 | 4,25 | 8537 / 753 |
| OPUS | 4,5 | 2512 / 231 | 4,75 | 2618 / 214 | 5,0 | 2611 / 200 |
| G.729.a | 3,9 | 611 / 154 | – | – | – | – |
| G.722.1 | – | – | 4,4 | 61 / 59 | – | – |
About TrueConf (http://trueconf.com)
A video conferencing software developer TrueConf was founded in 2003. The company develops individual and corporate solutions in the field of video and audio transmission. TrueConf products are designed to transmit high-definition digital video data. They integrate hardware units into networks and provide video conferences with up to 250 user terminals. TrueConf’s software can be used both with PCs and with conference hall equipment. TrueConf has produced over 1000 successful video-conferencing solutions, including projects across various industries in CIS countries. TrueConf corporate video communication products are used by governments and educational institutions, financial establishments, and small and large businesses involved in all types of activity.
Video conferencing software for business, education, telemedicine and government.
