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525/60 refers to a NTSC analog TV signal. Although NTSC only has 486 horizontal lines in its Active Area, a NTSC video signal also includes extra vertical sync lines, which are basically just filler timed to allow the electron guns in a CRT television time to reposition themselves at the top of the screen. There are 39 vertical sync lines, resulting in a total of 525 lines (486 + 39).
60 is a reference to NTSC's Fieldrate of approximately 60 Fields per second, resulting in 29.97 (30 / 1.001) Interlaced frames per second.
Digital Video Fundamentals - Resolution and Aspect Ratio
|Video Capture Cards with Analog Video Inputs|
Related glossary terms
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VirtualDub (Open source)
VirtualDub is an extremely efficient video capture and processing program.
Extremely efficient video capture and processing program. This version is not the latest one, but this is the last version that has ASF support
VirtualDubMod is a modified version of the excellent video handling tool, VirtualDub. VirtualDubMod adds support for MPEG-2, AC3, Ogg Vorbis and VBR MP3 to the original VirtualDub.
VirtualDubMod Surround (Open source)
VirtualDubMod Surround is a VirtualDubMod with some bugs fixed. It's also capable of utilizing 6 channel audio ACM encoders.