Video resolution refers to the number of pixels contained in each frame. This determines the amount of detail in your video, or how realistic and clear the video appears. This is measured by the number of pixels contained in the standard aspect ratio of 16:9 (the most common aspect ratio).
A higher number of pixels means a higher resolution and a lower number of pixels means a low-resolution video.
For the common resolutions of 720p and 1080p, the naming convention is based on the total number of pixels running in a vertical line down the display area.
For 2K, 4K or 8K video, the resolution is named for the number of pixels running in a horizontal line across the frame.
In short - the larger the number of pixels, the higher the quality of video, and therefore - the larger file size.
The size of a media file can vary significantly depending on multiple factors.
-Photo size can vary depending on multiple factors, including the color depth, the file format (JPEG, PNG, TIFF, etc.), compression level, and the actual content of the image.
-Video size can vary depending on multiple factors including the resolution, frames per second, bitrate, audio quality, length of recording, and the file format (MOV, MP4, AVI, etc.), compression level, and the actual content of the video.
-Audio size can vary depending on the audio format (MP3, AAC, WAV, etc), bitrate used, and length of recording.