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 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
