You can find a collection of useful examples on the bigflake site.
In particular, the ExtractMpegFramesTest
demonstrates how to decode a .mp4 file to Bitmap
, and the DecodeEditEncodeTest
decodes and re-encodes an H.264 stream, modifying the frames with a GLES shader.
Many of the examples use features introduced in API 18, such as Surface
input to MediaCodec
(which avoids a number of color-format issues), and MediaMuxer
(which allows you to convert the raw H.264 elementary stream coming out of MediaCodec
into a .mp4 file). Some devices will allow you to extract video to YUV data in ByteBuffer
, modify it, and re-encode it, but other devices extract to proprietary YUV color formats that may be rejected by the API 16 version of MediaCodec
.
I'd recommend coding for API 18 (Android 4.3 "Jellybean" MR2) or later.