ffMetadataEx

Standalone FFmpeg metadata extractor app plugin for OuterTune

Usage

ffMetadataEx is an optional standalone plugin that contains the FFmpeg libraries required for the FFmpeg tag extractor.

1. Install ffMetadataEx. Download one that is compatible with your OuterTune version.

2. Grant ffMetadataEx either permission: storage or "Music and audio". Both OuterTune AND ffMetadataEx require this

3. permission.

4. Select scanner. To configure which scanner implementation OuterTune will use, open the OuterTune app and navigate to

5. "settings --> Local media -> Metadata extractor". Then select the desired extractor.

Developer use

At it's core, this extracts all the (text) tag data from audio files, and returns it in a plain text string, all in a somewhat hacky way. You are probably better using a more elegant solution. While this is built for OuterTune in mind, any app should be able to use this plugin.

Building

1. First you will need to setup the Android NDK

2. We use FFmpeg to extract metadata from local files. The FFmpeg binaries must be resolved in one of two ways:

   • a) Build libraries yourself. Clone ffmpeg-android-maker into /app/src/main/cpp/ffmpeg-android-maker, run the build script. Note: It may be helpful to modify the FFmpeg build script disable unneeded FFmpeg features to reduce app size, see here for an example.

   • b) Use prebuilt FFmpeg libraries. Clone prebuilt ffmpeg-android-maker into /app/src/main/cpp/ffmpeg-android-maker.

3. Start the build are you normally would.