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Topic: foo_dsp_downmix (Read 39030 times) previous topic - next topic

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  • 2E7AH
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foo_dsp_downmix
Reply #25
I don't know if phase shifting is needed as rear channels aren't downmixed or else

ffdshow is constantly developed. the latest is from dec.2009, but search other site not sourceforge

eac3to is also tool you may try for batch processing, for example:

eac3to 8ch.wav out.wav -down2 -phaseshift

  • Sylph
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foo_dsp_downmix
Reply #26
This needs to get updated for the latest version.

  • CoRoNe
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foo_dsp_downmix
Reply #27
It seems the downloadlink in the first post is dead and the only place I found so far with a working downloadlink is THIS one (version 0.2).
Perhaps I'm looking in the wrong place, but otherwise it may seem [a href='index.php?act=findpost&pid=473785']tebasuna51's post[/a], with some useful proposals, is completely ignored.

I was wondering... https://en.wikipedia.org/wiki/Matrix_decode...oding_.282:5.29 tells me the DPL2 matrix, which foo_dsp_downmix also seems to be using (except that √½ ≠ 0.7070), is as follows:
1   0   0.7071 (√½)   0.8165 (√⅔)   0.5774 (√⅓)
0   1   0.7071 (√½)   0.5774 (√⅓)   0.8165 (√⅔)
But https://en.wikipedia.org/wiki/Dolby_Pro_Log...coding_matrices tells me the DPL2 matrix is:
1   0   0.7071 (√½)   0.8718 (√19/25)   0.4899 (√6/25)
0   1   0.7071 (√½)   0.4899 (√6/25)    0.8718 (√19/25)

Which one is the right one?

Furthermore, is there a way to determine if Phase Shifting is necessary for DTS?
DC-Bass Source Mod: http://reino.degeelebosch.nl

  • romor
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foo_dsp_downmix
Reply #28
Links are dead. It wasn't trivial to find it, that's why I uploaded it for future use here: http://www.hydrogenaudio.org/forums/index....showtopic=95569