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[Discuss] Syncing audio/video from two sources?

I've got an HDMI pass-through widget that records the audio and video to a
file, and I'd like to use it when I record the BLU meetings in order to
capture the presenter's display and add it to the video from the webcam.

The traditional method of syncing two sources would be to use a physical
clapstick to create a short, loud snapping sound that can easily be synced
with one specific frame of the video. But the pass-through widget is
recording audio and video from the laptop's HDMI port, not from a camera,
so it cannot capture audio or video of the clapstick to sync with.

An animated clapstick that runs in a web browser should do the trick, but
several google searches have not turned up anything like that. A standalone
app would also work, though that would mean finding instances for Fedora,
Ubuntu, MacOS, Windows, and possibly other platforms, as presenters could
potentially use a wide variety of OSes for their presentations. A web app,
or perhaps a java app, would be platform agnostic.

Can anyone point me to something like that, or suggest another way I could
sync the HDMI recording to the webcam recording?

John Abreau / Executive Director, Boston Linux & Unix
Email: abreauj at / WWW / PGP-Key-ID 0x920063C6
PGP-Key-Fingerprint A5AD 6BE1 FEFE 8E4F 5C23  C2D0 E885 E17C 9200 63C6

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