[Video] Recording premix?

[Paul Wayper]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi all,

One of the downsides of DVswitch has been that it only allows you to record
the final output, after the operator has chosen which of the many video (and
possibly audio) feeds to display.  On the one hand, this can lead to 'Mark
Pesce' moments where it would be really great afterward to display an
audience reaction or a picture of the presenter rather than the (offensive)
slide.  On the other hand, there are many times where the operator just
doesn't quite start the recording on time, or switches to the slides a bit
too late, or cuts away from something a bit early.

(Aside: one of the problems I had with LCA 2013's video was that one person
in the organising team decided that, in order to prevent any 'Mark Pesce'
moments, all rooms had to record raw streams for the camera and the
presenter's laptop as well as the final output.  This caused a lot of
problems, both in engineering a solution and in trying to store all the
excess video.)

Even with raw DV, hard disk sizes these days make it not infeasible to
record all streams.  Certainly once we look at storing compressed video, the
space requirements to store the raw video streams cease to be a problem.  We
simply need to store a relatively simple cut list file - such as what Melt
uses - as well as the video.  Transitions such as fades, and picture in
picture display, can also be stored relatively easily (although I have no
idea how to do such things with Melt).

Reviewing and editing those cut lists would be a matter of time and
opportunity.  Obviously, if no further work needed to be done the project
could simply be mixed down and encoded as is.  But the opportunity to fix
things is always useful.  It would also make sense to have the ability to
only record the post-mix anyway - to render on the spot, as currently done -
if the user was space or time constrained or had other reasons.

Thoughts?

Paul
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.13 (GNU/Linux)
Comment: Using GnuPG with undefined - http://www.enigmail.net/

iEYEARECAAYFAlHEa2cACgkQu7W0U8VsXYKfxwCfcAHIQkpV3eR7w93zYCOcQPTb
1SsAoMjw7K/VtxpZoYx4Sp/yT0/4oB+c
=dab1
-----END PGP SIGNATURE-----