When posting Redmi phone videos on Douyin, you need to use the built-in camera app of the Redmi phone or the Douyin app itself to record. Once you have recorded a video, you can convert it to other formats or perform other processing. The specific steps are as follows: Open the Douyin app and find the Redmi phone video you recorded. Click the share button and select "Save to local". Connect the phone to the computer and copy the video file to the computer using a file manager or similar application. Open the video converter and select the video format you want to convert, such as MP4, AVI, etc. Add the video file to the converter and start the conversion process. After the conversion is complete, you can share the video file to other platforms or applications, such as WeChat, QQ, etc. It should be noted that the built-in camera app of the Redmi phone supports a variety of shooting modes and effects, which you can adjust as needed. At the same time, when posting Douyin videos, you need to pay attention to the regulations and restrictions of Douyin to avoid violations.