I'm getting these threads confused since they are essentially asking the same question.
If you absolutely have to play 9 clips on that laptop at 25 fps at the same time, then you will need to use something other than PAL DV. I would suggest trying quarter frame PAL 352x288 using photo-jpeg compression. You will get smoother playback using the 'auto 1' 'rate 1' messages to pix_film since those use Quicktime's internal tasking methods to get frames.
cgc
On 11/6/05, B. Bogart ben@ekran.org wrote:
Hi Paul,
Ok 1 projector, that makes things a little easier.
9 videos is a lot, I have never done that many on one machine. Chris Clepper mentioned getting 3 DV videos playing on his laptop in Gem. When you say DV downgraded to 33% what does this actually mean? Compression quality of the size of the image?
I would suggest Gem as a good way of getting lots of video data onto the screen without fancy filters or pixel effects.
for codecs I would experiment, but like I said I'm pretty DV is limited to video resolution (NTSC or PAL).
Try 9 160x120 video clips and see how well that works.
You may need to spread them clips over multiple drives (which for you means external firewire) to get the right disk bandwidth.
jpeg-codec is a good start since it sounds like you are interested in some frame accuracy...
Good luck.
b.
Paul Sellis wrote:
Thank you for your answers Ben and Mathieu.
*** 4 nov. 05 at 14:44, B. Bogart wrote :
How many projectors?
for this project only 1. But I'd like to learn a software which can synchronize more (lets say 3 or 4…).
DV codec (I think) is only ever 720x480 NTSC, can't be downgraded, you would need to encode in a different format to get a different size. So what codec, what size?
It's a DV Pal (so 720x576) downgraded at 33%. I did it (and the hole sequence…) in Flash and ActionScript with the new Flash video codec. The animation works fine. The only problem is that I am obliged to use external video (not embeded) so with Flash I must use FLV. And the quality seems not to be sufficient for video projections. In this case, I don't know if it's possible to do each of these 9 movies with no compression (I don't think so with my laptop…). Which codec would you recommand to me ?
Interactive video or just video playback?
In this case it would be just video playback
What HW are you planning to use?
My Apple G4 PowerBook 1,25GHz (???…)
I would not suggest jitter for such a project as far as I imagine putting straight video up... softVNS would be be my second suggestion after pd/Gem Linux/OSX.
I don't know "soft VNS"… Is there a kind of "reference chart" where abilities and weakness of each solution is displayed. it seems to be a kind of maze for me now… :-((
Performance or installation?
In this case an installation. But I have opportunities to work for performances… I'd like to learn a soft (Max/MSP, PD,…) which could be great for all this… (doesn't seems to be the case…)
How long will it run?
Up to 9 minutes. Looping. Each movie begins at a random point between the begining and the end of its duration. It will be placed in a place choosen between 9 possible places (next between the 8 remaining places, and so on…). Everyboby plays until the end and wait x seconds after the last movie has finished. Then the whole thing loops.
Video playback or seeking?
Video playback not streaming (was it what you were talking about ?)
I'm quite lost with the possibilities of Max/MSP, PD (or soft VNS…). I don't even know if that's possible to do that kind of things. I only know that it works fine in Flash with Actionscript…
*** 4 nov. 05 at 18:52, Mathieu Bouchard wrote :
If you are going to do any effects on those videos in realtime you should say what you want to do because Gem differs very much from Jitter.
No effects in realtime on these videos. Only playback…
Your advises are more than welcome. ;-))
PAul
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list