设定声音流量(Audio Bitrate):这个也用默认就好 设定M1V编码器(MPEG-I Encoder):ffmpeg与mencoder 2种 一般使用编码器
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Very-low bitrate audio-visual coding 甚低速率视听编码
For example, Apple's guidelines state that a video's audio stream should never have a higher bitrate than 40kbps.
例如，苹果的指引说明视频的音频流，不应该比40kbps的比特率更高。
With out six combo boxes, we opted to allow the configuration of the video resolution, framerate and bitrate, as well as the audio sample rate and the compression bitrate.
借助这5个组合框，我们选择支持如下配置：视频的分辨率、帧率和比特率，以及视频的采样率和压缩比特率。
Improved bitrate reporting accuracy for various audio formats.
改进多种音频格式的比特率报告精度。
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