小白提问音轨问题

Dolby TrueHD Audio English 6172 kbps 7.1 / 48 kHz / 6172 kbps / 24-bit
(AC3 Embedded: 5.1-EX / 48 kHz / 640 kbps)

一个这样的音轨——请问那条嵌入进去的AC3是何作用？为什么能发挥这样的作用？

小白兔3000问。{:7_755:}

围观  兔刷。。。。

Dub or 导评，自己看看文件信息就知道了。

TrueHD内核就是AC-3啊

我是这样理解的Dolby TrueHD 是次时代音轨，有些播放器不支持，这样就会没有声音，AC3基本所有播放器都支持，内嵌了一条AC3 音轨后就可以避免没有声音了。

看来六楼回答的很有道理

6楼正解

5，6楼说得对

这是dts 几种次世代音轨的回滚机制，如果播放设备不能处理音轨，就播放内核。如果可以处理，就将内核与扩充信息一起处理。

有点类似于SACD 在普通机器上播放CD层，SACD层将CD层的信息予以扩充。支持SACD的机器将两层一起处理，从而达到理想的预设音质。

我的理解，描述可能不对。你可以看维基百科摘引DTS HD 白皮书：

According to DTS-HD White Paper,[5] the DTS-HD Master Audio contains 2 data streams: the original DTS core stream and the additional "residual" stream which contains the "difference" between the original signal and the lossy compression DTS core stream. The audio signal is split into two paths at the input to the encoder. One path goes to the core encoder for backwards compatibility and is then decoded. The other path compares the original audio to the decoded core signal and generates residuals, which are data over and above what the core contains that is needed to restore the original audio as bit-for-bit identical to the original. The residual data is then encoded by a lossless encoder and packed together with the core. The decoding process is simply the reverse. Note that DTS-HD lossless audio coding is always variable bit rate.

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