问题:

I know how to capture video on android device, but i would like to capture video and add some other information on it e.g. some funny timeclock and save it all to file so the person watching the video will see the exact time of capturing. I would also like to add some watermark. Do you know how can i do it or is it possible on android device? I read the API but couldnt find anything that could help me.

回答1:

I actually don't think that's possible. You can fetch video frames from a camera preview, but there's no good way to encode them to video. The standard video encoder (MediaRecorder) can only record the actual direct camera input into a video file.

回答2:

I was being asked this question a short time ago, and as a backup we came up with some sort of backup plan: send your stuff to a server and let that (using ffmpeg?) do the watermark, save the file, and send a link back to the phone.. Maybe that's a route to take?

edit: There seems to be an android port possible for FFMPEG. see for instance this link: http://gitorious.org/~olvaffe/ffmpeg/ffmpeg-android

I haven't had the time to compile it myself, but it seems you can either use the normal FFMPEG and the NDK, or use this version to compile for android. It's a bit more work, but looks do-able.