I hadn't really tested the element with pop-on mode, and the row
for each line in the input text was hardcoded to 13, which was
clearly wrong.
Switch to incrementing it properly.
C.9 Automatic Caption Erasure (Preferred)
[...]
Some manufacturers have suggested building automatic timeout into their
decoders. They propose that if no data are received for the selected caption
channel within a given time, the decoder should automatically erase the
caption. Such erasure may supersede the intentions of the caption service
providers and institute one maximum display time for all captioning services.
If such a timeout is deemed necessary, however, the time limit should be no less
than 16 seconds, an amount of time said by caption service providers to be longer
than their most enduring caption. It is preferred, when automatic caption erasure
is used in a decoder, that only displayed memory be erased, since some caption
service providers may, contrary to recommended practice (see Section B.8.3), send
pop-on style caption data to non-displayed memory more than 16 seconds before
sending the EOC command which causes the caption to display.
This change also puts the `target/` directory first, for locally-built
plugins to take priority over distribution-provided plugins. It also
encloses the environment variable in quotes, in case it contains paths with
spaces.
In this mode, cues are output as soon as they are ready for
display, without a duration. This can be useful in live mode,
when downstream is OK with determining the duration after the
fact, through clear=True.
The consequence of this is that the current roll-up window will
be output repetitively, it is up to downstream to deal with that
how it prefers.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/554>
The time driver for the threadshare runtime assigns the timer
entries to the nearest throttling time frame so that the timer
fires as close as possible to the expected instant. This means
that the timer might fire before or after the expected instant
(at most `wait / 2` away).
In some cases, we don't want the timer to fire early. The new
function `delay_for_at_least` ensures that the timer is assigned
to the time frame after the expected instant.
The calculations on the floating point numbers can't get out of the
expected range by construction expect for rounding errors at the limits.
Rounding errors at the limits shouldn't lead to assertions, so instead
clamp to the limits.
For the region property this would be provided as
`region-name+https://region.end/point`
while for the URI this unfortunately has to be base32 encoded to allow
usage as the host part of the URI.
