The specifications of a video frame, particularly its dimensions, vary depending on the video standard and resolution. Based on common formats, frame specs are primarily defined by the number of pixels horizontally and vertically.
Common Video Frame Dimensions
A video frame is essentially a single still image in a sequence that creates the illusion of motion when played back quickly. The size of this image is measured in pixels (horizontal) by lines (vertical). Different video standards dictate these dimensions.
According to common video standards:
- A digital NTSC video frame has dimensions of 720 pixels x 486 lines.
- A PAL video frame has dimensions of 720 pixels x 576 lines.
For High Definition (HD) video, the dimensions are significantly larger:
- HD video with 1080 lines uses 1920 pixels per line, resulting in a frame size of 1920 x 1080.
- HD video with 720 lines uses 1280 pixels per line, resulting in a frame size of 1280 x 720.
These HD formats (1920x1080 and 1280x720) typically have an aspect ratio of 16:9, meaning the width is 16 units for every 9 units of height.
Here's a summary of these common frame specs:
| Video Format | Dimensions (Pixels x Lines) | Aspect Ratio (Common) |
|---|---|---|
| Digital NTSC | 720 x 486 | Varies (often 4:3) |
| PAL | 720 x 576 | Varies (often 4:3) |
| HD 720p | 1280 x 720 | 16:9 |
| HD 1080p (or 1080i) | 1920 x 1080 | 16:9 |
Understanding these dimensions is crucial for tasks like video editing, encoding, and playback, ensuring compatibility and proper display.
