Hey On Thu, Mar 6, 2008 at 8:06 AM, robcanning <robcanning at eircom.net> wrote: > Dan Dennedy wrote: > > On Tue, Mar 4, 2008 at 2:32 AM, robcanning <robcanning at eircom.net> > wrote: > >> > >> i am currently working on a multichannel video installation using > >> kdenlive and four different projectors playing four synchronized films [...] > > used with SDI boards. However, you might be able to get multiple SDI > > outputs working as a poor man's solution. > > (did you mean multiple SDI outputs as a poor mans solution or something > else? multiple sdis seem kinda rich mans solution no?)
Heh, dangit, SDL and SDI are so similar to each other! I meant multiple SDL output as the poor man's solution. :-) > i thought there might be an easy solution for this but it seems not. > I'm quite happy to forget about monitoring the 4 outputs during the > composition of the piece and just focus on frame accurate synched > playback of the final rendered files. > i was looking at ivysync http://montevideo.dyne.org/wiki/IvySync which > says it can sync upto 4 mpeg2 files out IvyTV <http://ivtv.sf.net> > supported hardware decoders You could also do something using DV and firewire DV/analog converters. The project sponsor of MLT first sponsored my development of dv1394d, which is the foundation of the miracle video server software I described. Either a MPEG-2 or DV solution would require everything to be pre-encoded, which is a drawback and why MLT and miracle were developed. At the moment, neither dv1394d or miracle have a way to simultaneously start playback of multiple units, but within a matter of a second, it should be possible to send the play command to each unit. It would also be trivial to add a new command to do this. > i think maybe ivysync maybe a good solution but if anyone can think of a > better way i'm all ears :) DV over FireWire has a little "warmup" time for the device to lock on. There might be less accuracy in a DV-based solution than the ivysync one. Also, you should know that the developer of IvySync, Jaromil, has recently started hacking with MLT. Hmm, doing a little research on ivtv, and I see there is a framebuffer kernel module and an X driver with XVideo support. Also, I wonder if it possible to direct the XVideo of certain video display cards to its TV-Out. I had a feature on my old Matrox card and Windows driver to do that. It could take whatever was sent to DirectDraw video overlay and send that alone to the TV-Out. Jaromil should know more about this. It would be interesting to add ivtv compatibility to MLT and IvySync-like behaviour to Miracle. -- +-DRD-+
