Question about eac3to and 7.1 Audio-Channel-Layout

[zeropc]

this might have been asked or maybe not...

i just made a test for dts-hd 7.1 to mono-wavs and multi-channel wav. but no matter what the original 7.1 layout is, eac3to would always output the two extra channels as BL and BR. i even created a dts-hd file with 5 front and 2 surround channels, yet ea3cto outputs the standard BR and BL.

so my question is: does eac3to not see the channel layout in the stream or is it just using a standard layout no matter what?

with the current version of the dts master audio (v2.6) you can create seven different 7.1 setups and one 7.0 setup. it would be nice to have eac3to output mono-wavs properly.

[tebasuna51]

Yes, that was discussed several times.

The problem isn't in eac3to but in ArcSoft decoder.

When you have a audio stream you can send it to you amplifier/receiver without decode or you can decode the stream to PCM inside your PC.

- When the receiver, than know the speakers config attached to it, see the channel-layout of your stream must convert the channels present in the stream to the attached speakers.
If you send 5 front and 2 surround and there are 5 front speakers and 2 surround speakers attached, no problem.
But if there are 3 front speakers and 4 surround the receiver must downmix the 5 front input to the 3 front output, and upmix the 2 surround input to the 4 surround output (1).

- When you decode with ArcSoft in your PC to PCM the channel-layout input must be converted to a standard PCM channel-layout output, and not always there are a exact correspondency between DTSHD input channels and PCM output channels. With your example the player ArcSoft decoder must do a channel mix like (1).

If you want recover the original channels of a dts-hd with a not standard layout you can use dts master audio.
But if you want play exactly a not standard channel-layout you must use a receiver with the same speakers channel-layout attached.
Encode to not standard channel-layout don't have sense if you want play with standard receivers.