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How to upmix 2.0 surround to 4.0 / 5.1 ?


I would like to correctly extract the surround matrix, but there is no effective tutorial on the net.

Is there any free or paid software that can accurately extract the surround information, as it should have been at the origin?

I would like to preserve the surround encoded on my tracks of laserdisc pal before slowdown, pitch correction and synchronization … For this, I have to extract this information before altering the “surround image” of these tracks.

Edit: Found !

Are there other methods? I would like to test and compare them