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I need to record video with timestamp on each video frame. I see a example in cts which use InputSurace.java and OutputSurface.java to connect Decoder and Encoder to transcode video files. Is it possible to reuse these two android java class to implement a timestamp video recorder?

I try to use OutputSurface as Camera preview output and use InputSurface as MediaCodec Encoder input but sounds like only record 2 or 3 frames then it hang there forever!

beetlej
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  • You might be interested in another approach using MediaRecorder and mobile-ffmpeg [here](https://stackoverflow.com/a/65505434/361413). – bk138 Dec 30 '20 at 10:26

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Take your time and explore this link to get an idea how to feed the Camera preview into a video file. Once you are confident about the mechanism, you should be able to feed the MediaCodec input surface with some kind of OpenGL magic to put extra graphics on the top of the Camera's preview. I would recommend to tweak the example code's drawExtra() as a start.

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