Lei Feng Network (search "Lei Feng Net" public concern) : This article reprinted from WeChat official event information release platform "WeChat pie." The original title was: The Little Secrets of WeChat Small Video. Why is the maximum time for WeChat small video 6 seconds? How much traffic does a small video consume? Is the small video so small and clear?
"The black in front of me is not black, what white you say is white."
You must have had this experience. You will see a beautiful scene or a very interesting scene. You really want to record and share it, but it's no use finding it. Even if it is to eat with friends, there is often such a dialogue:
where are you? What do you see? To accurately describe a thing is not an easy task.
Word Poor Video Now, in order to solve the problem of real-time sharing, WeChat launched the “Small Video†function in the 6.0 version: Users can directly enable the camera from within WeChat, take a video up to 6 seconds in length and send the video to a friend through a dialog box. , or publish it in a circle of friends.
WeChat version 6.0 takes small video as one of the core highlights and announces the advent of the video era. By now, a large number of users have become accustomed to sharing the freshness and touch of life with small videos. No longer need to be foolish to type, no longer have to think about expression, small videos help you to achieve "What You See Is What You Get."
But do you know,
| Why is a small video recorded for only 6 seconds?Many times, users often use WeChat outdoors, the network is unstable, and the traffic is also limited, which is not suitable for users to publish or view large-size video files. Limit the duration of the video (no more than 6 seconds), and optimize it to make it smaller, which is more conducive to publishing and viewing on mobile.
The processing of the small video to 6 seconds is mainly to reduce the pressure on the receiver's flow and the psychological pressure during playback. In fact, before the official release of the mini video, WeChat's “siege lion†conducted a six-month experience test and found that 6 seconds is the most suitable length.
In order to do the test, the developer also specially wrote a debugging tool named "kitchen", which is a function module configured as a global switch variable. Changing a value, the configuration takes effect immediately, and it is convenient for debugging. It's like a PS tool that helps developers find the optimal path. The length of 6 seconds is the most suitable length found with the support of this tool.
| Since it is a small video, then how small flow of video consumption is small?There is a very simple conversion: the small video in the chat, the size of each video is approximately equal to the size of the 2 friends circle picture, and the small videos in the circle of friends each equal to 3 friends circle picture size.
Compared to the long video, the data volume of 6 seconds of small video is less than 400 KB in the iOS system and 200-300 KB in the Android system, which means that the three small videos consume about 1 MB of traffic.
Moreover, the logic of small video loading is seen no longer loaded, not seen without loading, is loading before viewing, will take the initiative to help users save traffic.
The text is too boring, the picture is too quiet, and the small video is just right.
So, no matter if you are shooting a small video or watching a small video, don't be under pressure. According to the current traffic cost standard, such as China Mobile's 500MB package of 30 yuan, three small video only 1MB, about 0.06 yuan.
If you don't know clearly, take a small video. If a small video is not clear, take two. If two small videos are still unclear, it would be OK to shoot three videos.
| The question is, small video is so small, but also to clear it?This is about the two parameters, rate and resolution, which are closely related to the “clearness†of vision.
The code rate determines the quality of the video. The higher the original code rate, the clearer the video, and the resolution determines the magnification of the video image. The code rate has the following principles:
A. The code rate is proportional to the video quality, but the file size is also proportional to the code rate.
B. The code rate exceeds a certain value and does not have much influence on the quality of the image.
Compared to long video, video coding algorithms for small video are not really different. However, due to being limited to less than 6 seconds, the volume is greatly reduced, and is mainly played on the mobile terminal. WeChat finds a balance between video quality and size, allowing users to use it without pressure.
In fact, the small video is convenient to use, and the interactive experience is good. It is not just a small amount of traffic, and there is no pressure to open. In order to get a better interactive experience, there are many small secrets that you don’t know about “recording and playing†in shooting and playing. For example:
Pre-start - Press to record. Pressing a small video starts recording without waiting for the preparation of audio equipment and files. This will ensure that you capture what you want to capture in a fleeting moment. Imagine every time you take a picture and race against it to know how important this small feature is.
Jitter monitoring - you have a quick reminder. In order to ensure the shooting effect, according to the change of the acceleration of the gyroscope, the system will automatically detect the jitter of the mobile phone and make a reminder.
Dim environment monitoring - Too dark to light up the selection : When the shooting environment is too dark, the small video will prompt you to use the "lighting mode" to optimize the shooting environment. How is this intelligence achieved? In fact, each pixel in the video has a different RGB color value. In order to quickly process and react, an average value is obtained by scaling it. When the RGB average value is lower than a certain set value, such as less than 17, Pop-up prompts to quickly distinguish between the surrounding environment.
Mute playback - click to enlarge to have sound. The small video is played with sound only when it is click-magnified, and it is looped to be close to the effect of GIF. When not full-screen, the recorded small video remains muted.
In the process of iOS version optimization, the WeChat team designed multiple playback technology solutions, and finally chose to bypass the iOS system player and have at most 16 restrictions, while adopting a video player developed by themselves to meet the requirements of the same time. Play multiple videos and other needs. In order to prevent the stuck interface during shooting, the Cache layer is added during video recording. The video frame is buffered first, and then the background thread writes the video when the CPU is idle.
These troublesome "little tricks" can completely eliminate your focus and know what to focus on, zoom, exposure compensation, white balance, etc. You just need to pick up the phone to shoot.
Before the "small video" appears, you can send videos via WeChat, or send short videos on other platforms. However, you need to temporarily stop other things, press record, press STOP, and then confirm sending. The procedure is cumbersome and the video is very large. The person who received the video only dared to watch under Wi-Fi.
WeChat 6.0 brings a little video like the “Magic Newspaper†in Harry Potter. Whether it's watching a wonderful program, enjoying a delicious meal, or any other moments of life, you can use a small video to put that kind of video. Be immersed and share it.
It is embedded directly in the chat scene, passing information that is not fabricated, glorified, or intelligible, and allows you to participate in a minimalist way of “press and hold†to make interaction easier. It is like a pair of eyes and takes you through the transformation of the four seasons.
Oh, it feels familiar.
Lei Feng Net Note: Reproduced, please contact the authorization, and retain the source and the author, not to delete the content.
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