Quote:
Originally Posted by hello_hello
I think the idea behind the wave file channel ordering was simply to increase the number of channels without making too much of a mess.
|
The original RIFF/WAV specs allowed for this.
Quote:
Originally Posted by hello_hello
When the two channels in a stereo wave file are left and right, why when you add a third (ie centre) would it be logical to put it in the middle?
|
No. When stereo appeared (stereo doesn't mean 2 channels but spatial), people put a number of speakers around the listener. It was the need of a researcher and his paper to demonstrate that stereophonic image can be obtained with only 2 speakers. So 3 speakers were a triangle. Like 4 channels in the '70ies were placed around the listener not all in front of him. Therefore a third channel is more logical to be Center-Back rather than Center-Front.
Quote:
Originally Posted by hello_hello
The wave file format is THE intermediate PC format used when converting between one format and another. Import a 5.1ch AC3 file into Audacity and then do the same for 5.1ch AAC file. They'll both be imported using the wave file channel order.
|
It is not. Audacity does not need AFAIK to convert to WAV any file it processes. It converts them however to raw (L)PCM which is not WAV.
I wonder how the engineers at Dolby or in Hollywood converted the audio to Dolby 5.1 when WAV lacked this possibility. Hm, Hm, Hm
Quote:
Originally Posted by hello_hello
I don't know why that needs explaining to Ghitulescu unless some decoders decode use a different channel order and encoders accept different channel masks to define the input channels.
|
Half-knowing is dangerous, as I see
Channel mask is the MS invention. Dolby had presets: 4 channels could only mean L,R,Ls,Rs, and this could be combined with LFE to get 4.1.
Quote:
Originally Posted by hello_hello
So your recent efforts to convert 4.1ch audio to 5.1ch audio? That was all Microsoft's fault and nothing to do with your hardware not decoding 4.1ch correctly?
|
No, the hardware correctly decoded the files that were not WAV, but I could not get there without passing through WAV due to the tools I am allowed to use. 4.1 it is allowed in Dolby Digital (also in real life, as the video part was dolbidised), see above.