Adding watermark bitmap over video in android: 4.3's MediaMuxer or ffmpeg

Question

Here is my scenario:

• Download an avi movie from the web
• Open a bitmap resource
• Overlay this bitmap at the bottom of the movie on all frames

Answer 1

If you need do this without ffmpeg on Android device:

Start from : https://github.com/google/grafika

The answer on your question between Play video (PlayMovieActivity.java) and Record Gl App (RecordFBOActivity.java) examples.

Steps:

1. Setup mInputWindowSurface as Video Encoder Input Surface.

2. Decode frame from video stream using MoviePlayer as video (external) texture.

3. Draw this video texture on Surface.

4. Draw watermark on the same Surface over video texture.

5. Notify MediaCodec that surface ready for encoding:

   mVideoEncoder.frameAvailableSoon(); 
   mInputWindowSurface.setPresentationTime(timeStampNanos);
   

   and then goto Step 2.

Don't forget to adjust speed of decoding. Just remove SpeedControlCallback which in example set to decode 60 FPS video.

Advantages of this way:

1. Media Codec use hardware decoder/encoder for video processing.

2. You can change bit rate of result video.