使用MediaCodec API编辑MP4元数据

Question

Android SDK provides class MediaMetadataRetriever for extracting metadata from MP4 files. Is there a way to edit MP4 metadata fields using MediaCodec API (without ffmpeg)? My task is to reset rotation field.

Answer 1

mp4parser seems to be what you are looking for, although I'm not certain where exactly the rotation field is located in the MP4 (I don't know enough about the file layout). If you know which box (or "atom") the metadata is stored in, then the MetaDataRead and MetaDataInsert classes are pretty clear examples of how to read and write the data (they specifically work on the iTunes "Name"/"Title" field, but writing other metadata works the same way, once you know where it should be located). Hope this helps!