如何判断一个音视频编解码器是否“好”？
如果不深入分析源代码，是否可以对编解码器的好坏做出明智的决定？我所说的“好”是指它暂时可以在 VOIP/视频聊天应用程序中充分发挥作用，并且人们不会指望它很快就会过时。
我正在尝试确定一家负责维护特定编解码器的公司是否值得他们的信任，或者他们是否会因为 Skype/qik/gtalk/ichat 而被淘汰。然而，对于这个问题，我试图在真空中判断编解码器本身，忽略了这样一个事实，即存在大量竞争，使相关业务的生活变得非常困难。
谢谢，
～乔丹
Without in-depth analysis of the source code, is it possible to make an informed decision on whether or not a codec is good? And by "good", I mean that it would serve adequately in VOIP/Video Chat applications for the time being and one would not expect it to be outdated soon.
I'm trying to decide if a company, responsible for maintaining a particular codec, is worth their salt or if they're on their way out thanks to skype/qik/gtalk/ichat. However, for this question, I'm trying to judge the codec itself in a vacuum, ignoring the fact that there is a lot of competition making life very difficult for the business in question.
Thanks,
~Jordan
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MOS 适合评估音频质量，但 MOS 取决于“编解码器质量”以外的许多因素，特别是延迟、回声、丢包——这里编解码器可以发挥作用，因为不同的编解码器对丢包有不同的敏感度——即使有隐藏，G.729 也确实受到了伤害，而 0 损失时的 iLBC 可能比 AMR-NB 和 G.711 稍稍落后，但在损失情况下它非常有弹性。
编解码器有很多需要评估的因素：无损质量、丢失下的性能和隐藏能力、渲染非语音的能力（等待音乐等）、算法延迟、不同语言的性能、对可变比特率或样本的支持然后是外部因素：特许权使用费/专利/专利诉讼风险、实施的质量和数量、其广泛程度和标准化程度等。
MOS is good for evaluating audio quality, but MOS depends on many things other than "codec quality", in particular delay, echo, packet loss -- and here codec can play a part, in that different codecs have different sensitivities to packet loss - G.729 is really hurt by it, even with concealment, while iLBC at 0 loss may be a smidge behind AMR-NB and G.711, but under loss it is very resilient.
Codecs have many things to assess: no-loss quality, performance under loss and ability to conceal, ability to render non-speech (music-on-hold, etc), algorithmic delay, performance in different languages, support for variable bitrates or sample rates, etc, etc. Then there are externals: royalties/patents/patent-lawsuit-risk, quality and number of implementations, how widespread and standardized it is, etc.
听起来您想要的是编解码器的平均意见得分 (MOS)。
Sounds like what you want is the Mean Opinion Score (MOS) for the codec.