Livecamera with 1.5minutes delay over one hour
....i have a splitscreen of 4 izzy-projector on one HD-Projection: 2 x livecams, 1 x 1,5 minute delayed livecam (from one of the two livecams via component - blackmagic intensity pro) and 1 x p-jpeg.mov file.
the Splitscreen has to stay round aboute 1 hour - that means the data of the delayed camera has to be buffer for one hour - i`am right? - yesterday during the rehearsel - after half an hour the delayed cam-stream went to black - i had to restart the scene...if the delay-data are stored in the ram -could i go up with the ram from 16gb to 32gb and would be able to delay 1 hour of a live stream??? - any idea how to solve the problem???
Fred last edited by
Record and play back one hour chunks instead I am pretty sure Isadora is still only 32 bit so you cannot access this much ram.
mark last edited by
Dear Bodo,Fred is right. Isadora can only access 2GB.
Here is the formula for the amount of RAM you need if you are using the Video Delay
horz_resolution x vert_resolution x 4 x FPS x 60 x minuteswhere 4 is four bytes per pixel, and 60 is the number of seconds in a minute.
So, for instance, with HD video, you would need1920 x 1080 x 4 x 25 * 60 * 1.5 = 18.66 Gigabytes -- that's more than Isadora can do.If you set the mode to YUV, then the "4" becomes a "2", and it is 9.3 GB. Still too much. But for SD Video with YUV it should be possible640 x 480 x 2 x 25 * 60 * 1.5 = 1.38 Gigabytes.I hope that helps.Best Wishes,Mark
Dear Mark and Fred,
thanx for the informations...yesterday i went down with the resolution input settings (of the component-hdtv camera) to quarter -and it worked well! - but to get more resolution the capturing idea would be interesting but for my understanding - capturing is not possible i think - because the delayed video has to run constantly over one hour beside (on the Splitscreen) the non delayed-stream - and i think a captured video only appear in the media window (ready to play) if you press -stop capture to disk (in my case after 1,5minutes) _ this means i have only 1,5 minutes delayed video -isn`it ???
mark last edited by
Dear Bodo,The only other thing I can think of is to do this:1) Start Recording Movie 12) After X minutes, stop recording movie 1, start playing movie 1, start recording movie 23) After X minutes, stop recording movie 2, start playing movie 2, start recording movie 14) Repeat steps 1 and 2 over and overThere will be a glitch though... this is for sure. But you could then go on forever.Best Wishes,Mark
thanx for the tip but as i had anyway -for each of the 4 Windows of the Spliscreen- anly the quater Resolution of the full HD Projektor so it was ok with the quater input resolution for the Livecamera -which was delayed - and i have to say it worked like a charm!!!