On Wed, April 28, 2010 00:43, Snaky Love wrote: > Hi, > > first a BIG THANK YOU for this very promising project! Looks really > interesting! Please keep up the good work! >
Thanks, I will try to. > What I want to do: I would like to use my old DV Cams (not HDV) for a > realtime interview situation. I can not afford a live DV mixer / switch, > so > I found LIVES :) > > My question: is it possible to mix / switch two dv cams and stream the > results + write the mix to a file in DV or MPEG2 quality? Has anybody done > this before? If it is possible, what cpu will this need? (Audio should > come > from Cam A always.) > If the cameras have firewire or TV outputs you can mix the two cameras in LiVES 1.3.2 or higher. Just go to File -> add live input, and add the two cameras. Right now it only supports video (no audio) so you would have to look into other methods of capturing audio. If you press the "r" key before or during playback, you can record the incoming video streams. For mixing, you can for example press ctrl-8 and select foreground and background clips as the two cameras. I have managed to do this in realtime on a 2.GHz AMD64. After recording you can then render the recorded frames and encode to dv or mpeg. > Even more: is it possible to do the same as above plus add overlay (text) > to > the video before streaming + writing out to a file? > LiVES in realtime mode can only mix two sources, so if you want an overlay it could only be done on one camera stream at a time. But there is a text overlay effect, which you could use to overlay basic text over both streams mixed. > Even more: is it possible to apply any effects like color correction to > video data and compression to the resulting audio? I am thinking of adding > some nice effects + jingles and apply these live while recording. Also > subtle color correction to make pics of two different cams fit better > would > be really nice! > You can apply a colour correction to the foreground frame. This can be done in realtime. You could then apply a second colour correction to the mix. What you cannot do (yet) is apply effects in realtime to the background clip. As I mentioned, audio from the cameras is not yet supported, but you could have some audio clips loaded and switch between these with a camera stream in the background. I would recommend using a MIDI controller for all this, you may find it easier to control. I would advise also reading the LiVES manual, because all of this is pretty advanced functionality. The manual is now a bit out of date and so does not cover the live inputs, but all the rest of the stuff should be described there - look at the sections on the clip editor, switching clips and applying realtime effects and transitions, and recording/rendering. Cheers, Gabriel. > I wanted to test it, but I think it is better to ask before I try doing > things that are impossible (yet) :) I know I am talking about features > present in expensive hardware, but maybe with a very fast processor (or > two > or four) this can be done today? Any experiences with this kind of usage > for > lives? Would be a great help for the independent video underground... > > Thank you very much for your attention! > > Snaky > ------------------------------------------------------------------------------ > _______________________________________________ > Lives-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/lives-users > ------------------------------------------------------------------------------ _______________________________________________ Lives-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lives-users
