Dan Dennedy wrote: > 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?) >> > > hi dan, > Heh, dangit, SDL and SDI are so similar to each other! I meant > multiple SDL output as the poor man's solution. :-) > i dont know much about different hardware types - will research this > >> 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 guess this wouldn't be frame accurate sync - but i need to research the hardware types to fully understand what you mean. >> 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. > i suspect that this is possible - if so it would be very exciting to add this compatibility to Miracle! this would be great - maybe the answer to all my needs - i look forward to hearing what jaromil has to say on this.
At some stage in the near future i am going to build the installation computer to try things out with... i think the cards that jaromil recommends are the PVR350's which i guess are these http://www.hauppauge.com/pages/products/data_pvr350.html i'd be happy to be a tester and write up some documentation or help in some way if this feature may be a possibility :) let see... sounds like an exciting possible development though. thanks, rob c
