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The frame rate is a number of frames per second (FPS or fps) encoded into a video file, the human eye needs at least about 15 fps to see a continuous motion. Frame rate is also called a frame frequency and its unit is the Hertz (Hz), LCD displays have usually 60 Hz frequency.
There are 2 types of frame rates -
- interlaced (denoted as i after FPS number)
- progressive (denoted as p after FPS number).
Interlaced frame rate is used in the television:
- NTSC standard uses 60i fps, what means 60 interlaced fields (30 frames) per second
- PAL and SECAM standards use 50i fps, what means 50 interlaced fields, equals to 25 frames per second
Progressive frame rates of 24p, 25p and 30p are used in the film industry. Newer frame frequency 50p/60p is used in the high-end HDTV products.
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FFmpeg Basics