On Fri, 2006-01-13 at 18:50 -0600, John Lightsey wrote: <snip> > > > Chopping videos at the beginning and end could be minimized. If the > > > moderator gave a signal to start the talk, waited 3 seconds and then > > > began, we wouldn't need to crop the front. On the tail end, stop the > > > recording as the applause dies down. You'd have to convince tolimar to > > > limit his introduction to "Here's Blah with a talk entitled Blah" > > > though. :) > > > > This didn't seem to me to be too difficult, except that I didn't have a > > good video editor with which to get precise timings. > > It was much worse on the raw video during the first few days. Towards > the end it wasn't much of a problem. Sorry, I was thinking of the way I did it while transcoding. Cutting MPEG files without transcoding them is rather restrictive - the first frame would always have to be a key frame. At the DV stage you have more flexibility, but I realise that processing such large files is demanding. Perhaps where a video doesn't need any editing other than cutting, that could be done during the transcoding process. > > > I hope copies of the 2005 DVDs will be sold at Debconf. > > > > I had thought of that, but am not sure of the logistics. > > Perhaps you can link up with someone in Mexico to burn them there? > Hell, the DVDs from Debconf5 would be a nice addition to the bag of > goodies at Debconf6. Well that would solve the problem of guessing how many to make! > > 3. We should be wary of losing audio/video synchronisation. There were > > a few videos where the audio was between 100 and 300 ms late (my > > estimate). > > This was probably my fault. Without using a video/audio cue like a > clacker it's guesswork to line up two audio streams in Cinelerra. The > use of netcat for capturing video also caused lost frames in the booth > stream which would slowly throw it out of sync from the front camera > video. > > Mixing the front camera with the booth was a frustrating PITA in every > possible way. Not having got involved during DC itself, I'm afraid I don't know much about the recording process and its challenges. Perhaps you could explain this to me in private mail? > > 6. For two-part sessions, if they are happening this year, it would be > > nice to have the parts joined with a fade in and out rather than > > distributed as separate files. (Although using separate files makes > > chapter marks automatic in dvdauthor.) > > The files get really big though. The video editing machines had ?70GB? > of disk space so editing 2 hours of a presentation from 2 sources would > have filled the hard drives. We were really constrained by time, local > disk space and the slow network connection last year. What I mean is that the videos that are distributed should be joined together with a fade. At the DV editing stage I think it would only be necessary to add the fade effect. The joining together can be done at the transcoding stage. Ben. -- Ben Hutchings Anthony's Law of Force: Don't force it, get a larger hammer.
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