These checkboxes make it so one can stop any recording if common 'exit' keys are pressed. These keys are 'alt-tab', 'alt-F4', and 'esc'.
OpenGL and Direct3D9 enhancements:
If checked, this will help remove flickering images. It will also help performance when a game's frame-rate drops below the video capture rate, so it is very useful in making sure a game sustains an adequate frame-rate. It does not work in all games. If it does work in a game, it will cause a 'ding' to sound when the game begins. If this feature causes problems, please email email@example.com .
Direct X capture is the faster capture, but in some circumstances GDI may capture better. If Direct X capture is selected, and Guncam fails to capture in Direct X mode, it will default to GDI capture.
Real time compression:
The real time compression option allows a user to capture video for extended periods of time without quickly overrunning the available disk space. There are two types of compression: high compression and fast compression.
High compression uses a quality value from 1 to 100. A higher number will result in a better looking video, but the drawback is that the higher quality video takes up more disk space. This compression method can take up a significant amount of CPU time and can reduce in-game frame rate. It is advisable that one uses a small video size when capturing with high compression.
Fast Compression Version 1 compresses the video roughly 5X to 8X in real time with little performance hit over regular uncompressed capture.
Fast Compression Version 2 compresses the video roughly 6X to 9X in real time with little performance hit over regular uncompressed capture. It has less of a performance hit than Version 1.
No compression. This copies the video straight to disk with no compression. This can result in a high-quality capture, but if the video size of capture frame rate is too high, it might capture data at a rate higher than the data can be written to disk.