(eac3to) extracting AC3 from TrueHD

[hardy]

What's the command line for extracting the embedded AC3 640 kb/s from the original TrueHD audio file?
I'm familiar with extracting the Core from DTS-HD MA but not TrueHD audio.

example

eac3to input.dts output.dts -core

Thanks in advance

[sneaker]

It's basically the same:

eac3to input.thd+ac3 output.ac3 -core

Note that while DTS-HD MA always has a DTS core this is not true for TrueHD unless you are working with the un-altered BluRay. eac3to can be used to encode from TrueHD to AC3 with the bitrate of your choice, though.

[hardy]

It's already embedded, so no encoding. Just extraction.
Source is untouched.

[hardy]

---(AUDIO)---

Format..........: Atmos / TrueHD / AC3 embedded
Channels........: object based / 7.1 / 5.1
Bit depth.......: 24 bits
Sample rate.....: 48 kHz
Bit rate........: 4834 kbps / 4834 kbps / 640 kbps
Language........: English

^source^
How do you extract the AC3 embedded file using eac3to command line?

[sneaker]

I already told you how.

[hardy]

eac3to input.thd+ac3 output.ac3 -core

or

eac3to input.thd output.ac3 -core

[sneaker]

"input.thd+ac3" is just a placeholder for the filename of your file. eac3to should auto-detect the input no matter the filename. It can also directly work on m2ts and mkv containers.

[hardy]

I will give it a try
Thank you

[hardy]

another forum said you don't need -core

eac3to input.thd+ac3 output.ac3

[sneaker]

Hmm, it seems that other forum is correct. But it doesn't hurt either way so my command example still works as expected. If in doubt you can always read the eac3to log. It will tell you exactly what it is doing.

[hardy]

True, I appreciate the help from everyone.