I have some .dts & .ac3 files. How to convert .dts to dtswav & .ac3 to ac3wav (not decode to wav)? (Preferably using free tools)

The final dtswav or ac3wav should be like the ones in http://www.sr.se/cgi-bin/mall/index.asp?ProgramID=2446

You can do that for DTS files using dts2wav. It's free.

But, those clips on the Swedish Radio are encoded from 44100 Hz sources, and will sound fine when you burn them on a CD.
If you ripped those DTS or AC3 files from a DVD, they are 48000 Hz. So, if you don't want them to sound lower, you need to decode them first to PCM, downsample to 44100 Hz and then reencode to DTS or DD.
There are no free encoders for DTS. There are for AC3 but IMO they are not of very good quality.

Yeh, the .dts & .ac3 files are all @ 48kHz.

Unfortunately "dts2wav" only supports .dts @ 44.1kHz.
Is there any tool to downsample .dts or .ac3 to 44.1kHz?

"headac3he" was able to do .ac3->ac3wav but the ac3wav was slower (as expected).

Anyone has any ideas about "spdifer". It sounds promising but I didn't get it to work correctly.

If you want to add WAV header to ac3 file - VirtualDubMod can do this. Just open video file that is long enough, then go to Streams -> Stream list. Press "Add" button, then press "Save WAV".

Input files can also be video files and ffmpeg will extract ac3/dts stream.

Unfortunately this didn't work. The wav files properties are not like the ones in the http://www.sr.se/cgi-bin/mall/index.asp?ProgramID=2446
The wav files created by ffmpeg shows 6 channels and doesn't play in Foobar. I guess they are multichannel wav and not dtswav or ac3wav (which are essentially wav container/header for the .ac3/.dts files)



The wav files in the sr.se website show 2 channels and play in Foobar.

So you just need to wrap the ac3/dts stream into ACM wav file (like MP3, for expamle)?
Why do you need that or what are you trying to achieve?

This seems to be just a regular CDDA-like format audio file like if you grabbed it from a CD, I do not see any resemblance to ac3 or dts.

Yes, ac3wav & dtswav are actually .ac3 & .dts files in wav containers with false wav header as PCM/2 Channel. Thats the reason you see 2 channel/PCM in the file properties exactly like cda format.

The applications of such files are mostly in creating Dolby Digital or DTS audio CDs.

I think that I explained everything. Can you resample an MP3 file without decoding it first? The same goes for DTS an DD. For DTS you need Minnetonka SurCode CD (or DVD). You decode your DTS to 6 PCM wavs, downsample them to 44100 Hz using any resampler you want (but I would use a good quality resampler like the one that is built into Adobe Audition or Voxengo r8brain). Then you load the resampled files to SurCode and encode them to DTS. After that you can use dts2wav to wrap the DTS in WAV and burn it to the CD. That's the only way to do what you want. (unless there is an open source free DTS encoder out there that I'm not aware of)

DTS-CD

This is what I'm trying to do... I haven't yet got it to work. Does the DTS file have to be at a specific bitrate in order for this (1411kbps)? I tried dts2wav and it didn't work... ffmeg I just can't work out how to install at all, it doesn't even seem to be compiled...

I have no problems with dts2wav. Here is the log from SurCode DTS DVD. But it can output wav files itself