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They use something called Intermediate Spatial Format. It's a fixed 9.1.5 (yes, 5). That feature is very poorly documented, but it was never seen in EC3 files.

This is the fundamental error with your argument. Home Atmos formats are limited to 16 objects instead of 128 that's in the cinema, so some have to be aggregated. You can read about how they do that here. Since home Atmos is - in this regard - lossy, this is the point where you already lost your...

No, in this case it seems that the convolution is not real-time, but the entire track is preprocessed. This will be a hard optimization by the player's developer, requiring fundamental changes. As a workaround, I recommend using 32k filters, they're recommended down to 40 Hz. 64k is for 20 Hz...

Under Export/import and then Special settings for convolutions, check Use zero-delay convolution.

If you export linear phase filters, then the delay will be half the length of the filter, so it does increase delay. Try minimum phase filtering, it doesn't add any delay, and the phase impact is negligible. The linear phase option is only there for the absolutely minimal occasions that actually...

Which provider?

Are there any object-based AC-4 tracks out there? If yes, I can add it, the documentation is available.

Yes, a plugin for Microsoft Spatial Audio API. I'm still learning it.

The upmixer always worked real-time (CavernSplitter), but the Atmos rendering isn't. However, progress was made and the analysis/planning is done, it's possible, and while it's still hard, it's not as hard as I initially thought. QuickEQ is stagnating, but it's time alignment is already...

Dolby sells a scriptable reference player for $400, but otherwise no.

Upmixing by itself is a problem that is mathematically impossible. Let's say, your front left has a value of 4, your front height is 2, and added together (downmixed), it's 6. Your task would sound like this in math: the result is 6, what numbers did I add together? There are infinite solutions...

E-AC-3 JOC is done in Cavern, but TrueHD is completely closed source, and I think it always will be (DD+ had to be an open standard to compete in broadcast, and this made them lose all their royalties, even the encoders are now made by third parties).

It's possible to separate, but it's still an undocumented bitstream. Muxing is not really possible, it will result in noise. They are completely different formats. E-AC-3 has absolutely minimal precision, sometimes as low as 5 bits. Just the TrueHD Atmos metadata weighs as much as the entire...

There are three possible versions: - Matrixing (Dolby, Auro): upmixing purely mathematically, not necessarily by adding/subtracting channel signals, but doing the same with multiple subbands per channel. A subband is not frequency-dependent, the exact method used is called QMFB. - Height...

@goodkeys, the upmixer is a standard matrix-based 5.1, everyone's doing the same thing. Height generation is something that's done better by others, and DTS can even separate speech to the center entirely, that's only found in AVRs. If upmixing is a must, you can't skip an AVR. It's pre-render...

It could be a little hard to set up (Cavern Splitter), but it's just wiring stuff around in Equalizer APO, there's a sample file for 5.1.2.

If you really want to create 12 channels from 2, yes, it's possible, but it's really-really far from even a 5.1.

No, it only depends on what creates the flattest result. Qs can range from 0 to 20. Parametric EQ breaks the phase alignment if frequencies and Qs are not uniform (so always). Graphic (FIR) does not, and can even fix bad phase.

They are only graphic, these are their points (frequency-gain pairs). Parametric can only be exported with the "Export as peaking EQ" option. Itt will have up to 20 filters per channel, each in a new line. You might have to click the more button on the export tab for it to appear.

Use the "Export as peaking EQ" option. However, this has lower precision and worse sound quality.