[Ardour-Users] Are exports expected to be latency-compensated?

[Robin Gareus]

Hi Lukas,

In short, yes, export is latency compensated, both stem export as well 
as default master-bus export.  However calf plugins do not correctly 
report their latency (in addition to other flaws they have).

--
robin

On 10/10/22 12:22, Lukas Pirl wrote:
> Dear community,
> 
> are exports expected to be latency-compensated? E.g., is audio expected to be
> at the same positions as in the sources (given there is no intentional delay)?
> 
> In Ardour 6.9.0, I observe that the more plugins on a track/bus, the later the
> audio in the exported file. [1] This can cause obvious problems. E.g. a) when
> multiple tracks have different plugin-introduced latencies, stem-exporting and
> re-mixing the tracks. E.g. b) when exchanging updated stems with more/less
> plugins than in the stems exchanged before (when others edit, their edits are
> misaligned then). I tried the regular and stem export with the same results.
> 
> This is a simplified test setup:
> 
> track A -> bus "unproc" (no plugins) -> master
> track A -> bus "proc" (e.g., Calf Comp., Multiband, Limiter) -> master
> 
> Stem export to wav with "apply processing" enabled. Exported audio from bus
> "proc" and master is later in the export than from bus "unproc". Ardour does
> not report the latency to be ambiguous. "Disable PDC" is inactive.
> 
> Anything I miss or don't understand? Is non-latency-compensated export maybe
> desirable as well in some cases?
> 
> Thanks in advance and regards
> 
> Lukas
> 
> [1] https://static.lukas-pirl.de/export-latency.png
>    track "src": source track from interchange directory
>    track "unproc": no plugins, routing: track -> bus -> export
>    track "proc": a few plugins, same routing
>    track "master: same plugins, routing: track -> bus -> master -> export
> 
> 
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