# AR Video

* Supported file format: mp4 
* File size limit: within 30M 
* Supported video encoding format: H.264/AVC 
* Recommended audio coding format: LC-AAC or mp3

## 1. Best Optimized Method

### 1.1 Set the appropriate video bit rate

In order to have a more direct understanding, we use Youku Video and Tencent Video as the standard, you can see:

|               | HD                                        | Ultra-clear                                 | 1080P (Blu-ray)                              |
| ------------- | ----------------------------------------- | ------------------------------------------- | -------------------------------------------- |
| Youku Video   | Bit rate: >=800kbps Resolution: >=960x400 | Bit rate: >=1500kbps Resolution: >=1280x544 | Bit rate: >=3500kbps Resolution: >=1920x800  |
| Tencent Video | Bit rate: >=800kbps Resolution: >=640×360 | Bit rate: >=1500kbps Resolution: >=960×540  | Bit rate: >=2500kbps Resolution: >=1920×1080 |

So choose the appropriate bit rate according to your actual situation; \
\
Click here to view Youku video upload standards; \
\
Click here to view Tencent video upload standards;

### 1.2 Choose an appropriate video resolution

Do not set a video with a resolution ratio exceeding 1080P (1080x1920)

Estimate the size of the video displayed in the scene in advance. As shown in the figure below, we add an iPhone model to the Web3D scene, and then hope that the video will be played on the iPhone display screen. It can be roughly estimated that the width of the video is only about half the width of the device;

In addition, we know that Youku and Tencent's high-definition, ultra-definition, and 1080P standards are based on full-screen video playback. If the video only needs to be displayed as half the width of the device, then the resolution of the video can also be reduced by half. Prepare an ultra-definition video with a resolution of 720x1080, then we can convert the video to 360x720, but we need to keep the bit rate unchanged;

### 1.3 Set an appropriate video size 

It is recommended to keep the size of the video consistent with the video resolution, so that the nasty black border can be removed;

### 1.4 Set an appropriate video frame rate 

Generally speaking, if there is no special requirement, it is recommended to set the video frame rate to 25;

## 2. Video conversion tutorial

*Here is an example to convert a Microsoft AI promotional video (standard 1080P video) into a suitable video tutorial (resolution: 960x540, bit rate 1500kbps).*

### 2.1 Download video conversion tool Mediacoder

{% embed url="<http://www.mediacoderhq.com/dlfull.htm>" %}

### 2.2 Add video into Software

![](/files/-MF-sgmiML008PiwKR7V)

### 2.3 Set video parameters&#x20;

In addition to the following parameters, other options please follow the software default settings&#x20;

(1) Video bit rate, video encoding format (video)

![](/files/-MF-t8LqRxOvKCqaYWed)

(2) Audio coding format (audio)

![](/files/-MF-tr9c6O7q_YtPWSjr)

(3) File format (container)

![](/files/-MF-uXjWDS0rTr70bcMC)

(4) Resolution, frame rate (picture)

![](/files/-MF-ugF4pv1hhTcSwk-h)

Note: If you cannot find the resolution you want to set in the resolution menu, you can also set it manually, as shown in the figure below. This is mainly for videos with unconventional resolutions.

![](/files/-MF-uuECjOLolOr48Z2h)


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