Análisis comparativo de desempeño entre codecs de audio y video para videoconferencia sobre infraestructura VPN.

Abstract

The comparison of performance audio and video codecs for video conferencing over VPN infrastructure was performed by personal means in the city of Riobamba, Chimborazo Province. The videoconferencing involves converting voice and video digital information that can be transmitted by the network. To make this possible requires the use of encoders and decoders (CODECS). The analysis was executed on samples taken from several videoconferences with various scenarios. The selection of CODECS is made based on the most common in use, providing the best features. Besides all they have free license. To implement the test environment it was used the "Elizabeth" test as a videoconferencing application. This process has the same powerful tools which let to measure certain parameters such as bandwidth, packet loss and delay. These parameters will allow to measure performance of the CODECS. From the results of the investigation it was found that the performance of CODECS for video and audio were improved. The G726/24 XVID presented minimum consumption of bandwidth, Kbps 369.12 Kbps and 39.17 respectively, plus the low packet loss and the shortest delay. It is concluded that the selection of the type of codec that is used for video conferencing greatly affects the quality. Thus, it is recommended to take into account the characteristics of the transmission medium to make the correct selection of CODEC.