I would like to test the framerate variation from nominal value in a range of consumer video cameras.
For this I intend to film some sort of high frequency clock and compare the displayed clock time with the ideal time derived from the selected camera framerate.
Regarding specs, at the moment I'm not looking to measure errors lower than 1ms from the specified frame interval. The framerates I will test for are likely to be within 30 to 300 fps. In the future I might want to measure microseconds errors in 1000Hz cameras.
So I think I just need to be able to film a "clock" display device with a 1000Hz refresh rate and at least 1ms time precision.
My first idea was to use a set of 10 LED, using them as bits, which would allow me to encode 1024 values. The LED pattern would be updated every millisecond with the corresponding value, and I could measure the actual time interval between frames.
However I feel there is probably something already existing doing what I want.
Are there existing devices displaying time down to the millisecond and with a 1000Hz refresh rate ?
I am aware that the results will also depend on the use of a rolling shutter by the camera and the ability to manually change shutter speed.