File dts HD 8ch not compatible

Audacity Help Forum Windows
1

Good Morning

Audacity matter dts files regularly but up to a maximum of 6 channels,
if you import a file of more than 6 channels, are always returned 6 tracks.
Using the latest version 2.06 (.exe) with ffmpeg 2.2.2 and Windows 7 64-bit.

Mediainfo report:

General
Complete name                            : D:\05- Bluray in lavorazioneCORSARIDemux Blu-rayCutthroat_Island_t00.track_8ch.dts
Format                                   : DTS
Format/Info                              : Digital Theater Systems
Format profile                           : MA / Core
File size                                : 2.65 GiB
Overall bit rate mode                    : Variable

Audio
Format                                   : DTS
Format/Info                              : Digital Theater Systems
Format profile                           : MA / Core
Mode                                     : 16
Format settings, Endianness              : Big
Bit rate mode                            : Variable
Bit rate                                 : Unknown / 1 509 Kbps
Channel(s)                               : 8 channels / 6 channels
Channel positions                        : Front: L C R, Side: L R, Back: L R, LFE / Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Compression mode                         : Lossless / Lossy

How do I resolve this issue?




Thanks

2

As explained already, we can do nothing without an example file.

MediaInfo is confused about whether the file is six or eight channels too.

I already suggested two solutions. Use a different demux tool, or try demuxing to WAV.

If you think Audacity is to blame, use FFmpeg standalone to convert the file to WAV. If it produces six channels, then Audacity will do the same.


Gale

3

This is the sample file, I hope it can be useful for testing.
http://www.mediafire.com/download/v52y09wz4382ax3/Sample_Cutthroat_Island_t00.dts

Thanks.

4

Thanks for the file. I can confirm ffprobe (the FFmpeg analysis tool) sees the file as 5:1

 Duration: 00:05:38.60, start: 0.000000, bitrate: 1535 kb/s
   Stream #0:0: Audio: dts (DTS-HD MA), 48000 Hz, 5.1(side), fltp, 1536 kb/s

Assuming the file is encoded correctly, I suspect the reason is that the two missing channels are implemented as an extension and FFmpeg only reads the six core channels - see http://en.wikipedia.org/wiki/DTS_(sound_system)#History. I think this also means the file is lossy, because it does not have the difference channels which could be decoded to make it lossless.

So there is nothing Audacity can do. I suggest you report the issue to support for your demux tool. If they insist the file is properly encoded as eight channels, you can raise a feature request with the FFmpeg developers.

If you encode the file as 8-channel WAV, it should import correctly. Don’t just encapsulate the DTS audio in a WAV container, because FFmpeg won’t understand that. http://forum.videohelp.com/ is a good place to ask if you want help finding a tool to convert the file to 8-channel WAV. Obviously any encoder that employs FFmpeg will have the same issue.


Gale