What are aspect ratios, frame rates, bit rates, and codecs?
Explains terms that comprise the basics of video distribution.
What are aspect ratios, frame rates, bit rates, and codecs? Explains terms that comprise the basics of video distribution.
A glossary that presents technical terms that you should know when creating an internal newsletter for web applications. On this occasion, we will explain to beginners the terms necessary to know the video distribution that is being used more and more in the internal newsletter. [[1] App Edition] [[2] Cloud Peripheral Edition] [[3] UI Edition] [[4] Responsive Web Design Edition] [[5] Internet Basic Edition]
The ratio of the width to the height of the screen, such as images and videos. For example, the aspect ratio of digital terrestrial broadcasting in Japan was 16: 9 and that of analog broadcasting was 4: 3. The reason why there are left and right margins in the broadcast of the above program is because the aspect ratio is different. The following four types are typical proportions that you see often.
16: 9 (wide): digital terrestrial broadcasting, DVD, Blu-ray, YouTube
4: 3 (standard): analog terrestrial broadcasting
16:10 (WXGA): PC screen, projector
2.35: 1 (Cinesco) – Movie screen size
For the aspect ratio of the video content of the internal app / web bulletin board, unless there are special circumstances, we recommend the main 16: 9 that you are used to seeing on television. A resolution of 720 x 480 pixels (480p), 1280 x 720 pixels (720p), etc. should be enough.
Transmission
transmission
Transmission
A technology that allows you to immediately play audio and video content on the Internet while downloading it. Everyone will see streaming services like YouTube, Nico Nico Douga, Netflix, and Amazon Prime Video.
Since audio and video have a large amount of data, if you download all the data to your PC or smartphone and then play it back, you have to wait a long time until the reception is complete.
On the other hand, with streaming you don’t have to wait because you can download them little by little and play them in parallel.
● Advantages of transmission
Reduced waiting time
You do not need free space on your PC or smartphone
The distribution load on the server side providing video and music is also light.
It has the effect of deterring copyright infringement, such as the redistribution of video and music data.
● Disadvantages of transmission
Since internet connection is required, it is basically not available offline (even if the paid service provides a media storage feature)
Due to the large data capacity, a certain speed of communication is required. Playback stops and quality deteriorates on slow speed lines
For mobile viewing, you need to be careful about the amount of data communication transferred.
The number of companies that want to use video for internal public relations is increasing. Internal web / app newsletters are also expected to be used as a simple streaming video distribution channel.
frames per second
frames per second
frames per second
A video is a collection of continuous still images. Frame rate is the number of “continuous still images” per second (number of frames). For example, if the movement of “throwing a ball” for 1 second is represented by a still image, 24 frames can be viewed with movement smoother than 3 frames.
In this way, the element that determines “how smooth the video looks” is the frame rate, and the unit is FPS (Frame per second), which is expressed by the number of frames displayed per second.
It’s easy to think that smoothness is better, but the higher the FPS means that the amount of still images per second increases and the amount of video data increases.
For example, when recording event video, fluency is more important than data capacity, but what about security cameras? Instead of smooth movement, it is more significant to reduce the amount of data and continue surveillance recording for as long as possible.
If you want to create video content for your in-house newsletter, the frame rate (around 30 FPS) as shot with a smartphone is sufficient, but if you want to reduce the data capacity, it works fine down to about 20 FPS.
