Crop video in FFmpeg means to select wanted rectangular area from the input to the output without a remainder. Cropping is often used with padding, resizing and other editing.
Resizing video in FFmpeg means to change its width and height with an option, while scaling means to change the frame size with a scale filter which can be used to accomplish various tasks.
Encoded output file size calculation
The final size of encoded output is the sum of audio and video stream sizes. The equation for video stream size in bytes is (the division by 8 is for the conversion from bits to bytes):
Continue reading FFmpeg File Size Calculation of Encoded Output
A good understanding of the frame rate and the bit rate is important in the work with FFmpeg, frame rate and bit rate are the fundamental characteristics of the video and their proper setting is very important for the overall video quality.