[PLUG-AV] Result of 1st AV Workshop at Artifactory

[James Bromberger]

On 17/03/2011 6:45 AM, Jason Nicholls wrote:
> 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 :( 

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).

>> Anything else?
> 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).

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?


> I've used ogg theora/vorbis but the output isn't as good for filesize...

Was that using the suggested encoding from the wiki?:

    |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|




-- 
Mobile: +61 422 166 708, Email: james_AT_rcpt.to

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