Step 1: Open the format factory and select the file format to be converted. Take it. Take mkv as an example.

Step 2: Click "Add File" to add the video file to be converted.

Step 4: Click Output Configuration to set the information.

Step 5: Select Custom and modify the video configuration manually, as shown below:

Step 6: Click "OK" to confirm the conversion configuration, and then click "Start" to perform video conversion.