The documentation for liveadder says:

> The "latency" property
>  "latency"                  guint                 : Read / Write
> Amount of data to buffer.
> Default value: 60

It's confusing because it doesn't give a unit at all. 60 seconds? 60 milliseconds? 60 buffers?

I assume it means milliseconds based on this line in a different part of the page:

> Unlike the adder, the liveadder mixes the streams according the their timestamps and waits for some milli-seconds before trying doing the mixing.

If that's the case, I'd recommend changing the documentation to say:

> Number of milliseconds to buffer data

See: http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-liveadder.html