[757labs] HR Geeks II (Oct 21st)
telmnstr at 757.org
telmnstr at 757.org
Tue Oct 19 14:10:33 EDT 2010
> We'll be testing out the new A/V setup Ethan has been working on that will
> allow us to record (and stream?) presentations as well as pipe video around
> the lab. All in all pretty spiffy.
More equipment is on the way, pending bid sniping. So it's kind of an
interm setup until the goodies arrive. Once these arrive we will have 3
angles of pan/tilt/zoom/focus goodness, with presets for positions and
stuff. I found a brand of camera that doesn't get the love that the Sonys
get, but seems to be made of the same parts. Only downside is each camera
uses a serial port, but the AMX has 3. Heck, probably could just put the
things on the network.
I'm also trying to get at least one dual channel time base corrector. It's
a gadget that has enough RAM to store a frame of video. It takes a video
feed in for timing (I think), and then syncronizes the other video in/out
feeds so they are exactly in time with the primary.
The encoder card barfs when you switch the video feeds and the timing
isn't right. It just throws an error to the console and the audio goes
silent for a fraction of a second. This box will do the magic to fix it,
and sometimes the boxes can be had for $20 shipped. Someone suggested that
the capture card (Chris Smith's WinTV PVR-150 w/ hardware MPEG2
compression) was lame and should handle the out of sync video feeds, but
my research shows that no one really feeds out of sync video to switchers
and expects the output to ever work.
As far as internet streaming, the computer that is currently recording
video is an AMD XP-3000 or something. 3000+? It's 1.8GHz. It doesn't have
the CPU power to encode using VLC to stream to justin.tv. I think part of
this might be that the captures are mpeg2-ts (transport stream, which is
video and stereo audio.) I got the video capture card to shift to 320x200,
which I was hoping would make it easier on the encoding. But it still
wasn't happy. If there is a big event, we can take video from the switcher
and feed it to a camcorder (analog in), then hook firewire to a borrowed
laptop I can get, then feed that to the internets. For now though, I think
recording in DVD resolution is good? We can transcode and post it to
youtube/vimeo/etc easily from there.
Really, a core2duo is probably needed to do live streaming to sites like
justin.tv. It's mpeg4/h264 and it's mathematically intense. There are
coprocessor dongles like the Elgato Turbo.264, but I don't know if they
have much support out of things like iTunes.
Someone had asked why I go Justin.tv over uStream. uStream has more
advertisements, and they really cover up the video. Ustream pushes their
Adobe flash based tools. Justin.TV has the VLC streaming app, and some
other outside utilities. To go paid with ustream is pretty expensive, and
costs per viewer hour.
I don't have a real preference, the easier the tools are to
automate/script the more win, and the less advertisements covering up the
video the more win.
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