To edit OPPO Douyin videos, first open the Douyin app and log in to your account. Then click the plus button in the lower right corner and select the video you want to edit.

In the video editing interface, you can choose to add filters, music, text and other effects, and click the corresponding button to operate.

If you want to edit the length of the video, you can select the "Edit" function and determine the edited segment by dragging the start and end time points. At the same time, you can adjust the video speed, add transition effects, etc.

After the editing is completed, click the "Next" button in the upper right corner and choose to publish it to Douyin or save it to the album.

Finally, fill in the relevant video description and tags, and click "Publish" to complete the editing of the OPPO Douyin video.