On Wed, 2010-10-27 at 01:11 +0200, Frank Neumann wrote:
Hi Leigh,
I've just posted a video tutorial for seq24
-- it discusses what seq24
is, and what it isn't, and then proceeds to demonstrate the basics of
building and playing patterns. If you've tried it in the past and been
confused by its somewhat unique interface, hopefully this will get you
past that initial confusion. The direct Youtube link is here:
http://www.youtube.com/watch?v=J2WDHS1wYeM
Wow, that is finally one really nice tutorial video - very well done!
I like the quality of video and sound, the speed, the "entertaining bits" -
everything really!
Thanks! I've answered your questions below:
May I ask a few short questions about creation of this
tutorial (I tried
to write them so that a simple yes/no suffices in most cases ;-):
- What toolchain did you use? Was it the Xephyr/jack_capture/ffmpeg
package that others (AutoStatic?) had mentioned here or in other places?
Yep, I used AutoStatic's Xephyr and ffmpeg setup for capturing the
video. For the audio, I recorded straight in to Ardour -- that let me
record the synths I used in to separate tracks so I could adjust the
voice and music levels after recording.
- What frame rate did you choose for video - 15fps?
I had ffmpeg set to 30 FPS -- I can't say for sure that it captured at
that rate all the way through, but I was definitely happy with the
results.
- I assume you first write out to disk mostly
uncompressed video at the
highest possible quality and then do a re-encoding to your selected target
video format offline afterwards?
I used ffmpeg's default MPEG-4 compression, but with a very high maximum
bitrate -- that gave me high quality, a manageable (large, but not too
large) file size, and relatively low CPU usage. Here's the command I
used:
ffmpeg -an -f x11grab -s 1280x720 -r 30 -i :2.0 -vb 10000000 tute1.avi
- Did you experience any audio/video out-of-sync
problems which you had to
compensate for by e.g. time-stretching the video?
Nope, the audio I exported from Ardour lined up perfectly with the video
from ffmpeg. To make it easier to line them up in Kdenlive during the
edit, I started the video by hitting the "send test note" button in
XSynth; I was then able to line up the button press in the video track
with the sound of the note being played by XSynth in the audio track.
- Since your voice comes over pretty clear, I assume
you did not do live
voice recording, but rather overdubbed it afterwards by "watching and
commenting" your own video?
For the intro, I recorded the voice independently, and then lined up the
images and slides, and the little "apt-cache search" video, with that --
I made use of Kdenlive's video speed features here to speed through the
footage of the seq24 package installing.
For the rest of the video (the actual screencast), I did just record the
audio and video together in one take -- I had my mic set up so I could
talk in to it comfortably while working. If you listen closely, I'm sure
there are a few mouse or key click sounds in there as evidence of
that :)
If the screencast sounds rehearsed, that's because it kinda was -- I
actually recorded a very similar tutorial screencast a week earlier.
Once I decided to add the intro, though, I scrapped that video and
re-recorded it.
Thanks
Leigh