eac3to - audio conversion tool

[Nico8583]

Thanks a lot
If I want to convert DTS-HD to AC3, I'll extract first DTS core then convert it so no need to an external decoder.

[kypec]

Originally Posted by Nico8583

If I want to convert DTS-HD to AC3, I'll extract first DTS core then convert it so no need to an external decoder.

No need to extract DTS core first, eac3to can convert it directly to AC3 on-the-fly if no suitable external DTS-HD decoder is installed.

[Nico8583]

Originally Posted by kypec

No need to extract DTS core first, eac3to can convert it directly to AC3 on-the-fly if no suitable external DTS-HD decoder is installed.

Thanks for the info, so why an external decoder is needed ?

[nevcairiel]

The external decoder is only needed if you want to decode the full DTS-HD.

[jj666]

It doesn't make sense to convert the DTS (lossy) core to AC3, the sensible approach would be to convert the full lossless DTS-HD stream.

Cheers,

-jj-

[Nico8583]

I don't have any idea about size difference between DTS and AC3, if size is similar yes it doesn't make sense. But if there is a consequent difference, it could be util.
So if I want to convert DTS-HD to AC3, I need an external decoder but if I want to convert TrueHD to AC3, no need to an external decoder ?

[jj666]

I mean from a compression point of view, compressing from DTS to AC3 is just reducing the audio quality (as you are compressing the original source twice). Compressing DTS-HD to AC3 would be a single compression step. You would need the Arcsoft decoder dll installed to facilitate working with DTS-HD.

TrueHD on Blu-ray will always contain an AC3 core which you can extract, there should be no need to encode anything.

Cheers,

-jj-

[Nico8583]

Thanks
I've seen there are several versions of Arcsoft decoder, one support 6.1, another support 7.1 but not a single version to support both. Is it true ?

[tebasuna51]

Nope. At least version 1.1.0.0 support 6.1 and 7.1

[Nico8583]

Good news, thank you !

[Nexin]

Thanks ndjamena for the .bat script will see if can make eac3to work with them for what I need

[elmarikon]

Cheers!

And thanx for your great tool!

I have two questions about it:

1. is it possible to decode / export lossless dts-hd audio?
I could not find a way to do so...

2. Is there a way to not have the "annoying" .log file?
Any options to suppress the creation of it?



All the best from Dammtor!

SwK

[the_weirdo]

Originally Posted by elmarikon

1. is it possible to decode / export lossless dts-hd audio?
I could not find a way to do so...

Yes. However, for decoding, you'll need some commercial decoders, e.g. ArcSoft DTS decoder.

2. Is there a way to not have the "annoying" .log file?
Any options to suppress the creation of it?

I don't understand why log file is "annoying". Anyway, you can disable log creation by adding -log=NUL to the command line.

[filler56789]

Originally Posted by the_weirdo

I don't understand why log file is "annoying".

Perhaps because it fills the HDD with unrequested junk?

[DarkSpace]

Originally Posted by filler56789

Perhaps because it fills the HDD with unrequested junk?

I must say, I agree here. I'd much rather enable writing of a log file and have it disabled by default than having to add -log=NUL every time.
After all, I have to specifically request eac3to to not create a file that I didn't ask for, which seems counterintuitive to me. And I must say, so far I have had absolutely no use for log files, because I always took the time to read what eac3to output to the console directly. And of course, I remember what my input command was (if necessary, I re-run it).

[Ryushin]

Solution found to dsmux problem when going to certain hard drives. Threads found on this problem:
https://www.doom9.org/showthread.php?p=1485220#post1485220
https://www.doom9.org/showthread.php?p=1546026#post1546026

Solution was changing the storage controller driver that the hard drive was connected to. In my case, I was using the AMD AHCI RAID driver. I changed that to Microsoft's AHCI driver and the problem was resolved.

It took a better part of an entire day to finally find a solution to this issue.

I hope this helps someone that might run across this same issue.

[beto]

Hi, I have a bunch of AC3 files that I have to apply a delay to. I know I can use eac3to or delaycut to apply this delay.

The problem with delaycut is that it does not support batches and I have to apply the delay manually to each file (it works but its cumbersome).

As for eac3to I know that Eac3to and More GUI support batches but for the life of me I cannot figure out how to use it to just apply a delay to my AC3 files. I am on Windows 8.1

Can anyone please advise on how to use the EAC3to GUI to apply this delay? I would prefer not to use the command line directly.

Thanks.

[Overdrive80]

I dont test it, you try this:

@echo off
Title Add/Remove delay by Overdrive

set /p delay="Insert delay in miliseconds (negative:-200 or positive:+200): "

for %%@ in (*.ac3) do (

"C:\Program Files\MeGUI\tools\eac3to\eac3to.exe" "%%@" "%%~p@\%%~n@_fixed.ac3" %delay%ms -silence
)

pause&exit

EDIT: Tested.

[beto]

Thank you. I will sure try this batch and see if I can adapt to it. Regards.

[LigH]

In general, I would recommend using the audio skew value during multiplexing into the container, instead of manipulating the audio stream... but well, AC3 is famous enough to know the bitstreams of silence blocks for many channel configurations.