On 08/24/2010 01:34 PM, Philipp Überbacher wrote:
Excerpts from Jeremy Jongepier's message of 2010-08-24 10:22:57 +0200:
Hello all,
I've uploaded a new tutorial to YouTube:
http://www.youtube.com/watch?v=pnAqk054g7E
So using sidechain compression in Qtractor with the SC3 LADSPA plugin.
Concerning screencasting, anybody any experience with this? For this
tutorial I used recordMyDesktop, but it captures video to Theora, so
after editing and uploading the quality degrades considerably. The big
advantage of recordMyDesktop though is that it has JACK support and that
the overhead is pretty small so I can still run my setup at a decent
latency.
I've also started playing around with FFmpeg. The video quality is
waaaaay better if you capture to a lossless format but I'm having my
thoughts on the audio part. I compiled FFmpeg myself with libjack-dev so
it has JACK support. But FFmpeg apparently has troubles to keep up with
latencies below 20ms, lots of xruns on the FFmpeg side (JACK doesn't
complain though). And I have the feeling FFmpeg lags on the audio side.
So I'm thinking about capturing the video part with ffmpeg and the audio
part with jack_capture and mux the stuff later. But if anyone has any
other suggestions, let me know.
Best,
Jeremy
Hi Jeremy.
I know little about screencasting, but I do know that recordmydesktop
can either encode on the fly or afterwards. Maybe it's possible to use
and convert its raw data, whatever format that may be, to something else?
The tutorial seems quite nice. I do have a little trouble with it
because you seem to have a really high resolution screen, and my biggest
screen has 1280x800. I'm also not sure it's a good thing that you can't
see the mouse, recordmydesktop has an option for that.
Seems to be quite a hassle to set sidechain compression up. The essence
being: know which sc3 port corresponds to what and what to route where.
I sadly couldn't get that from the video because of aforementioned
problems.
Regards,
Hello Philipp,
Concerning the mouse, that's a noob move.
I'm using a 1920x1080 resolution, which is also the maximum YouTube HD
resolution and this should yield the best results:
http://www.google.com/support/youtube/bin/answer.py?hl=en&answer=132460
And the SC3 ports, I explain it in the video, the first two inputs of
the 3-channel Synth Duck track are for the stereo audio input you'd like
to compress and the third input is for the sidechain compression source,
in this case a kick from Hydrogen. For the outputs, 1 and 3 are the
compressed audio signals that I feed into the Synth Mix track.
I don't know where recordMyDesktop stores its raw/cache files, but afaik
I have encode on the fly disabled.
Jeremy
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