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DTS or AC3 to AAC
141077
post Nov 1 2011, 18:44
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Hello there!

I'm from Germany so please excuse me if my english isn't very well. I currently work on something for my university. I'm gonna right down the process of converting an HD .mkv file to an iTunes friendly .m4v. The goal will be to have a file at the end which can be played on most Apple devices. So when there's one 5.1 audio track as a DTS or AC3 file in the mkv I want to have one 5.1 AAC audio track and one in stereo for the mobile devices. In the last two days I've been looking around for the best options and encoders in this forum and in the wiki, but I'm not quite sure what to use and what's even more important: why I should use that?

For this process I'll use a mac. I've read that the Nero Encoder give the best results but since it doesn't excepts .dts or .ac3 files I don't know what I could do. Should I convert the .dts file f.e. first into another format so that NeroAAC would recognize it? Wouldn't that mean a loose of Quality? That's by the way also a very important thing for my work. To know what would be the best options in the encoder and to know how big the quality loss could be etc.

I hope you can point me into some directions and tell me something relevant for my topic. Have a good night everyone!
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mixminus1
post Nov 1 2011, 19:35
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Well, first off, you say you're using a Mac, but then say you want to use Nero's AAC encoder, which is only available for Windows - so, which is it? smile.gif

The only utility for OS X that I'm aware of that might be able to do what you want in one step is ffmpegX, but I haven't used it in quite some time as it was always very buggy when I tried to use it.

Can you run WINE, i.e. Windows under OS X? If so, eac3to might be able to do pretty much exactly what you want very easily (and reliably!). I say "might" as I've never tried it under WINE. However, eac3to is essentially a stand-alone program, so it seems like it would be a good candidate for successful operation under WINE.

It can decode any surround format (although I think it still may have some channel-mapping issues with 7.1 DTS-HD, not sure), can output multichannel or stereo mixdown, and can easily pipe to neroAacEnc.exe for on-the-fly AAC encoding.

The only caveat is that I don't think it can output multichannel and stereo AAC files simultaneously - you'll have to do two encodes for each source file, or launch parallel instances (which should work, but I've never tried it).

This post has been edited by mixminus1: Nov 1 2011, 19:37


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Posts in this topic
- 141077   DTS or AC3 to AAC   Nov 1 2011, 18:44
- - mixminus1   Well, first off, you say you're using a Mac, b...   Nov 1 2011, 19:35
- - 141077   QUOTE (mixminus1 @ Nov 1 2011, 19:35) Wel...   Nov 1 2011, 19:49
- - Kohlrabi   I suggest to use foobar2000 in wine, with the DTS ...   Nov 1 2011, 20:59
- - mixminus1   FWIW, if eac3to works under WINE, it can read .mkv...   Nov 1 2011, 21:21
- - Kohlrabi   foobar2000 can in fact read MKV files, but I as fa...   Nov 1 2011, 21:27
- - 141077   QUOTE (Kohlrabi @ Nov 1 2011, 20:59) I su...   Nov 1 2011, 23:09
- - kode54   I think the 384 VBR setting means for stereo files...   Nov 2 2011, 00:12
- - 141077   OK thanks for that. What I'm not getting is ho...   Nov 2 2011, 16:05
- - smok3   as a 2nd option you might want to check my hippy O...   Nov 2 2011, 17:06
- - Kohlrabi   I just realised that if the intention is to conver...   Nov 2 2011, 19:42
- - 141077   QUOTE (smok3 @ Nov 2 2011, 17:06) as a 2n...   Nov 2 2011, 19:43
|- - Kohlrabi   QUOTE (141077 @ Nov 2 2011, 20:43) Can so...   Nov 2 2011, 20:25
|- - saratoga   QUOTE (141077 @ Nov 2 2011, 14:43) I just...   Nov 2 2011, 20:37
- - smok3   QUOTE (141077 @ Nov 2 2011, 20:43) just c...   Nov 2 2011, 22:50
|- - saratoga   QUOTE (smok3 @ Nov 2 2011, 17:50) Cant re...   Nov 2 2011, 23:31
- - smok3   QUOTE (Kohlrabi @ Nov 2 2011, 20:42) I ju...   Nov 3 2011, 10:09
|- - Kohlrabi   QUOTE (smok3 @ Nov 3 2011, 11:09) QUOTE (...   Nov 3 2011, 19:55
- - smok3   quicktime takes anything this days, afaik, so hand...   Nov 3 2011, 21:22


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