To keep file sizes and transfer rates under control, frame sizes and rates, along with sound sampling rates, are kept relatively low with very high levels of compression for each individual frame. Resolutions of 160×120 or 320×240 are common sizes, typically at 10, 12 or 15 frames per second, with picture quality equivalent to a JPEG setting of “50” with mono ADPCM sound sampled at ~8 kHz. This results in a very basic, but serviceable video output at a similar storage cost to MPEG (~120 kB/s video rate, ~8 kB/s audio – or approx 1 Mbit/s at 320×240 resolution), but with minimal processing overheads. This video is typically stored in the popular Windows AVI or Apple QuickTime MOV container files, generally viewable natively (or after installation of a simple codec) in most versions of the applicable operating system.