- Posts: 37
- Joined: Mon Sep 21, 2015 12:21 pm
- Location: Graz, Austria
The Sony FS5 and FS700 have a special high speed memory buffer that hold a certain number of frames of the raw sensor output (about 8 seconds worth at 240 fps in HD). Once this memory buffer is full, these cameras then playout the stored frames at a more normal frame rate (24 to 60 fps). So any debayering, image processing, etc. of the frames can happen at this slower playout frame rate (it doesn't need to happen at the full 240 fps).
The point is that in terms of the URSA Mini, it's not clear that the camera was designed with the kind of high speed memory buffer needed to do this kind of slow motion recording. Note that the Sony FS7 which has a similar sensor to the FS5, does not have this internal memory buffer hardware, and as a result it does not have the same slow motion recording operation. There's clearly some hardware required to make this happen (its likely more than just a firmware update).
Having said that, the URSA Mini can record up to 120 fps in HD windowed mode. So the question is, why can't it output this 1080p120 signal over its 12G SDI output port?
Actually 6G SDI should have enough bandwidth for 1080p120 and 12G SDI should have enough bandwidth for 1080p240, although I'm not sure if this is one of the resolution and frame rate combinations included in the 12G SDI specification.