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On 17/03/2011 6:45 AM, Jason Nicholls wrote:
<blockquote
cite="mid:AANLkTikWzbcVtRtLq=21M9O+XCW4rYnFm4HhAerSphL+@mail.gmail.com"
type="cite">Unfortunately I haven't found anything that will allow
me to switch my camera
to PAL mode (from NTSC) so it's a no go mixing it up with your
cameras and
dvswitch :(
</blockquote>
<br>
Well, we also have a such of webcams(!) that we can use
dvsouce-v4l2. There's a few programs in the dvsource package we can
play with to generate and send DV frames to DVswitch. So long as we
have two cameras to be able to give some change of shot to the
viewer - watching a 1 hour presentation from a single point of view
is a little boring (there's only so much spicing it up that
switching between overhead (Twinpact) and static shot of speaker
(video) can give).<br>
<br>
<blockquote
cite="mid:AANLkTikWzbcVtRtLq=21M9O+XCW4rYnFm4HhAerSphL+@mail.gmail.com"
type="cite">
<blockquote type="cite">
<pre wrap="">Anything else?
</pre>
</blockquote>
<pre wrap="">
I've been doing more testing with encoding and using the latest ffmpeg and
x264 building from source. The results are that it's faster but still
on my system
(dual-core 2.1ghz) it's too slow to do on-the-fly good quality encoding that's
reasonably small. So you either get a fatter nice quality stream or a smaller
low quality stream. Doing less-than-real-time encoding I've found some really
good settings to produce very nice video at very small sizes (~150MB/hr at
PAL rates). A combination of good de-interlacer (yadif), de-noiser (hqdn3d),
and unsharp filter (unsharp) really make a diff to the video output, then
encoding with x264 (crf of 30 or 28).</pre>
</blockquote>
<br>
Very cool. Were both cores in use when encoding, or just one? Do we
want a quad core i7 box for this or something else new and beefy?
Can you post your sample videos up with the command line you used so
we can see the difference?<br>
<br>
<br>
<blockquote
cite="mid:AANLkTikWzbcVtRtLq=21M9O+XCW4rYnFm4HhAerSphL+@mail.gmail.com"
type="cite">
<pre wrap="">I've used ogg theora/vorbis but the output isn't as good for filesize...
</pre>
</blockquote>
<br>
Was that using the suggested encoding from the wiki?:<br>
<blockquote><code><tt>dvsink-command -- ffmpeg2theora - -f dv -F
25:5 --speedlevel 0 -v 4 -a 0 -c 1 -H 9600 -o - | oggfwd
giss.tv 8001 $STREAMPW /CarlFK.ogg</tt></code></blockquote>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">--
Mobile: +61 422 166 708, Email: james_AT_rcpt.to</pre>
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