Boston Linux & UNIX was originally founded in 1994 as part of The Boston Computer Society. We meet on the third Wednesday of each month at the Massachusetts Institute of Technology, in Building E51.

BLU Discuss list archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Discuss] Syncing audio/video from two sources?

The pass-through widget records audio and video from the presenter's
laptop's HDMI output. There is no camera with which to record me clapping
my hands.

I need something that will be drawn on the laptop's display in order for it
to appear in the HDMI output.

On Fri, Oct 20, 2017 at 4:09 PM, Joe Polcari <joe at> wrote:

> Stand in front of the camera and clap your hands?
> On 10/20/17, 3:17 PM, "Discuss on behalf of John Abreau"
> < at on behalf of abreauj at>
> wrote:
> >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
> >_______________________________________________
> >Discuss mailing list
> >Discuss at
> >

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

BLU is a member of BostonUserGroups
BLU is a member of BostonUserGroups
We also thank MIT for the use of their facilities.

Valid HTML 4.01! Valid CSS!

Boston Linux & Unix /