I want to show filtered camera preview while recording a video using media recorder. To filter the preview i need frames normally which i can get that from onPreviewFrame() function but while recording video with media recorder, onPreviewFrame() function does not get called. So what i want to know , is there any other ways to get these frames for filtering and then show them after modification ? I checked some apps from Google Play for example, Videocam Illusion. Its showing preview with effects during recording videos. I want to do something like that but have no hint how to do so. So i will appreciate any help/hints/code/sample regarding the issue. Thanks.
I haven't done it myself, but searched for it not so long ago. There's an answer on StackOverflow to show modified buffer of PreviewFrame:
https://groups.google.com/forum/?fromgroups=#!topic/android-developers/yF6CmrIJzuo
And here, a google groups link on the same topic.
How can I manipulate the camera preview?
Hope this helps, I'm planning on an application that modifies the preview frames, but is not going to record anything.
Best Regars.
来源：https://stackoverflow.com/questions/12352615/how-to-show-real-time-filtered-camera-preview-while-recording-videos