Recording processing using MP4/OGG temporary files, stream copy, and customizable (lower) frame rates.
Discussion from https://github.com/bigbluebutton/bigbluebutton/issues/2483

PR #9857 was incomplete and did not completely fix the issues described in #9062 and #9110 (dublicate).

Collects the shared notes' HTML raw data and publishes it along with the other
recording files. The playback will fetch for this file and include an option to
display it's content over the chat.

Not sure what causes this issue, but there's nothing reasonable that can
be done to draw a shape with no thickness. Just skip it.

Playback a presentation does not start on iPad with iPadOS 13 and higher.
The root cause is that `mobileAndTabletCheck` does not detect an iPad as mobile device.
The reasons for this are discussed here:  https://github.com/serbanghita/Mobile-Detect/issues/795
A way to detect Safari on IPadOS as mobile device is described here: https://stackoverflow.com/a/60553965
I've added a function `detectLyingiOS13iPad` to work around this problem.

There's nothing reasonable we can do here if the font size is missing.

If the poll size happened to be not an integer, the poll generation would fail.
Round it to an integer for the generation tool.

Write a tool that generates the poll svg images directly from the
BBB poll description. This avoids the issues with special characters
in the gnuplot labels, and gives us a lot more flexibility in how
the polls are formatted and styled.

Someone on the mailing list had some recordings which were using the 2.0
playback, but were missing the deskshare.xml file (which should always
be present for 2.0… strange). It's safe to continue loading the recording
playback if the deskshare.xml file is not found, the recording will just act
as if there were no deskshare start/stop events.

Previously the setMediaSync function was only called after the deskshare
loaded, but by moving it to run after all media loaded, it now runs even
on recordings that didn't have deskshare. Make it do nothing (return early)
in that case.

If the secondary media loaded before the main media, it would run the
"setMediaSync" function before the main media player was setup. As a
side-effect of setting up the main media player, all of the event handlers
added by the setMediaSync function are detached, and so the secondary
media never starts playing.

Move the call to setMediaSync to after the media-ready events for all
media have fired, so that it can reliably attach the event handlers.

This reverts a bbb-specific customization made in the jquery.acornmediaplayer.js
file: it's restored to what the upstream player did. I can't find any explanation
for why this change was made in the first place? Reverting it doesn't seem to
cause any playback issues (Popcorn still works, in particular).

This reverts commit 04d31d30.

This reverts commit 4346b0fc.

The initialization order change to support captions moved the acorn
initialization to after some of the popcorn init had already run. We
have to move that function to run after we create the acorn player
so it references the correct #video element (since acorn replaces/
moves it during init)

Previously, the acorn player was being initialized before the asynchronous
load of captions information completed, meaning that the acorn player didn't
know there were caption tracks, and the CC selector control wasn't available.

Fixes #6463

It was previously trying to get the presentation name from the wrong variable,
which resulted in a nil value (which was treated as a blank string in
filenames). This caused the poll images to not be inside the presentation
subdirectories, and the poll image references in the svg contained a `//`
path, which would break the recording if it was uploaded to e.g. AWS S3.

This fixes font scaling in the presentation area, since that relied on
the <p> element inheriting the font size from the svg <g> that it was
inside of.

This was broken with the switch to the Foundation stylesheet base, which
set a fixed font size on the <p> element.