[ANSWERED] Frequency of video capture / isadora processing / beamer
eMTv last edited by Woland
I see we can set the target framerate of isadora up to 150 fps in the General Preferences panel.
My setup consists of a video camera capturing the stage, processed through Isadora, and sent to the beamer display.
My question is : if my beamer's frequency cannot be set higher than 60 Hertz (which, I believe, mean it can display 60 images per second), is there any interest for me to capture the video live feed at a higher framerate than 60 fps, and to set Isadora's target framerate higher than 60 fps, too ?
Thanks in advance for any examples and explanations.
First, in general you should go with the framerate of your source material. If your hardware does not support the same low fps (eg. 25fps), then you should go with a multiple of it. This is to prevent recalculation of timing and therefor frames, wich is performance consuming and can cause stuttering. Eg. if your content is created with 25/50fps, you should go with 50hz in all of the systems chain parts (PC -> projector and everything in between). If it was 30/60, go with 60. If your system supports the original fps like 25hz, through all the chain. You can go with this.
If you do live generated content, like animations out of isadora (eg. 3D particles, etc.) it could make sense to have higher frame rates, in certain circumstances. Eg. if the animations include very fast movements. Beside that, it most likely doesn't help to set higher framerates then the content has. It would only take more performance and in the case of recording, would result in bigger filesizes.
I you always work with similar hardware, look for their native refresh rates (projector -> 60Hz) and produce your content fitting to it (30 or 60 fps) keep in mind, higher fps leads to the need of higher hardware performance.