vloopback/effectv(WAS: preview video while ffmpeg is recording)

[Tyler Aviss]

Along the lines of video programs and saving+streaming at the same
time, does anyone know anything besides "effectv" for in-stream
modification of a video stream.

Depending on the kernel, getting a vloopback device created can be
something of a PITA, but effecTV can do fun things with webcam
streams, for example:

webcam -> effectv (altered video) -> vloopback -> some other app

It works with programs like Ekiga, and if memory serves me correctly,
Skype as well. It should also work therefore with most apps that would
be used to save video, in which case you'd also get a preview with
effectv (and could use "dumbtv" to see the regular stream and not add
effects).

Does anyone know of any other cool apps that do fun in-steam
modifications similar to effecTV, or other such tricks?

- TJA
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