how to add subtitle to 3gp video

How to add subtitle to 3gp video? Recommend:

　

The 3GP and 3G2 file format were designed to decrease storage and bandwidth requirements in order to accommodate mobile phones. 3GP and 3G2 are similar standards, but with some differences: 3GPP file format was designed for GSM-based Phones and may have the filename extension .3gp 3GPP2 file format was designed for CDMA-based Phones and may have the filename extension .3g2 Some cell phones use the .mp4 extension for 3GP video.
You can do add subtitle file or srt file to 3gp using Video Watermark Subtitle Creator. Because it is hard-coded subtitles.

Click http://www.watermarksubtitlecreator.com/down/VideoWatermarkSetup.zip to download and install
Video Watermark Subtitle Creator and install to your PC.

Step1.Launch Video Watermark Subtitle Creator, you will see the following main interface.
Click Add

,you can import one or more video clips into list.

Step 2:add subtitle file or srt file to 3gp.
Select "Subtitle" tab,and Click "Open" button. You can add .srt file in video clip and configure output format to 3gp.