Lets talk about video size, aspect ratio, and duration.
If we were to take flipbook animation, the size of the animation would be the size of the paper it was made of. In digital animation production, the size of the animation image is determined by how many pixels are arranged vertically and horizontally.
There are a variety of medio to watch videos, like TV, DVDs, and Youtube. When creating animation, you must determine the size of the image according to the platform you choose to use. The main video sizes are:
NTSC(SD) Widesceen- Image size of conventional analog wide TVs and DVD. Camera Size: 960 x 540 pixels (16:9) Aspect Ratio: Square Pixel
HDV/High-Definiton Video- Uploading high-definiton video to a mini-TV for uploading to a video shariing site. Camera size: 1280 x 720 (16:9)
HDTV/Full high-definiton video- Images are stored on a Blu-ray Disc and viewed on a HDTV.
Camera size: 1920 x1080 (16:9)
4K Ultra HD TV- Size for viewing on a 4K TV
Camera Size: 3840 x 2160 (16:9)
In addition to setting the image size, it is important to pay attention to the “pixel aspect ratio”. Normally, pixels are squares with the same height and width, but the images shot by some video devices have rectangular pixels on the screen, so if you do not change the pixel aspect ratio, the images will stretch horizontally. It will be in a state of being stuck. In animation production, squares with the same vertical and horizontal ratios called “square pixels” are basically used, so there is no problem if you select this setting.
For the duration, lets talk about the number of pages in different flipbooks. If you were to flip at the same speed, the length of the work with change depending on the number of pages in the flipbooks. The more pages or frames, the longer the animation
The amount of these pages becomes the playback time of the video in animation, and this playback time is called “duration”. Since the duration (playback time) is determined by the number of frames, it is customary in animations to count the length of time by the number of frames, not the number of seconds. × 24 frame rate (24 frames played per second): = 72 frames, which is indicated as “duration: 72 (frames)”.
At the actual animation site, the number of seconds for each cut is presented and recorded on the timesheet. When working with After Effects, convert the number of seconds written on the timesheet to the number of frames and set the duration. For example, when “2 + 18” is written on the timesheet, it means “2 seconds + 18 frames”, which means "2 seconds x 24 frame rate (24 frames played per second) + 18 frames = 66. Will be displayed, and the duration will be 66 (frames).