Livecamera with 1.5minutes delay over one hour

Bodo

....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???

thanx Bodo

Fred

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

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 minutes

where 4 is four bytes per pixel, and 60 is the number of seconds in a minute.

So, for instance, with HD video, you would need

1920 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 possible

640 x 480 x 2 x 25 * 60 * 1.5 = 1.38 Gigabytes.

I hope that helps.

Best Wishes,

Mark

Bodo

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 ???

ciao Bodo

mark

Dear Bodo,

The only other thing I can think of is to do this:

1) Start Recording Movie 1

2) After X minutes, stop recording movie 1, start playing movie 1, start recording movie 2

3) After X minutes, stop recording movie 2, start playing movie 2, start recording movie 1

4) Repeat steps 1 and 2 over and over

There will be a glitch though... this is for sure. But you could then go on forever.

Best Wishes,

Mark

Bodo

Dear 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!!!

best Bodo