Remember that the systemic latency for all USB audio devices on Linux can (and likely will) change every time the device is re-opened (re-used). This is a feature (bug) of the kernel USB audio class device support.
On Sat, Mar 20, 2021 at 11:07 AM Lorenzo Sutton <lorenzofsutton@xxxxxxxxx> wrote:
Hi David, all,
Creating a new thread as the old one was pretty long...
On 19/03/2021 15:22, David Kastrup wrote:
[...]
>> - Zoom H5 shows 4 inputs in jack: the L/R mics and the inputs 1 and 2
>
> Oh, can you just put the headphones right next to the mics (makes
> astonishingly little difference in comparison to direct connections) and
> use jack_iodelay for measuring out the latency of the H5 with your
> settings?
>
> Numbers are surprisingly hard to come by for any audio interface.
>
This is what I got by connecting jack_delay to one output and putting
the headphone right in front of the microphones (connected only one to
the jack_delay input). These are common jack settings I use or have used
with this device, although the 32 Frames is very unstable and the 64
Frames one gets a few xruns depending on what it's used with (but still
more usable). The 128 Frames settings is very stable.
SR Fr/p Avg. delay reported (ms)
------+-------+-------------------------
48000
128,2 22.7
64,3 18.7
32,3 14.2
44100
128,2 25.2
64,3 20.6
96000
128,2 22.6
64,3 18.6
88200
64,3 18.6
Hope this is useful /interesting
Lorenzo.
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