Got mails continuously from everywhere throwing question to me about AAC audio in H.323. So I arranged this post to example my previous posts: http://rg4.net/archives/1480.html, http://rg4.net/archives/1126.html, http://rg4.net/archives/1112.html The pcap file for this example can be downloaded here: HUAWEI_TE600-vs-ZTE_T800.pcapnp Here it is. 1. Basic knowledge: AAC LD descriptions in 14496-3 It operates at up […]
H.245
2 [20150822 Update] For the record, I didn’t find the right ITU-REC document when I wrote this post, and misguided by a claim of HUAWEI VP9650 which says it has AES256 supported, but when I sending out a call from VP9650, it showed a new DH group DH1536, so I made […]
About H.235 encryption algorithms
9 视频会议中，通常音频能力的比较是比较简单的，通常是只是比较一下格式就行了。但是aac系列音频就是一个例外。它有一个复杂的能力表示方式，在交互的时候也不会明确的指明确切的采样率，通道数，而是像264格式一样，给出的是能力的level上限，需要我们去匹配比较。这里简单的介绍一下aac能力，和工作中碰到的问题的总结。