Mp4Muxer

const val FILE_FORMAT_DEFAULT = 0: Int

The default MP4 format.

const val FILE_FORMAT_MP4_WITH_AUXILIARY_TRACKS_EXTENSION = 1: Int

The MP4 With Auxiliary Tracks Extension (MP4-AT) file format. In this file format all the tracks with auxiliaryTrackType set to AUXILIARY_TRACK_TYPE_ORIGINAL, AUXILIARY_TRACK_TYPE_DEPTH_LINEAR, AUXILIARY_TRACK_TYPE_DEPTH_INVERSE, or AUXILIARY_TRACK_TYPE_DEPTH_METADATA are written in the Auxiliary Tracks MP4 (axte box). The rest of the tracks are written as usual.

See the file format at https://developer.android.com/media/platform/mp4-at-file-format.

const val LAST_SAMPLE_DURATION_BEHAVIOR_SET_FROM_END_OF_STREAM_BUFFER_OR_DUPLICATE_PREVIOUS = 1: Int

Use the end of stream sample to set the duration of the last sample.

After writing all the samples for a track, the app must write an empty sample with flag BUFFER_FLAG_END_OF_STREAM. The timestamp of this sample should be equal to the desired track duration.

Once a sample with flag BUFFER_FLAG_END_OF_STREAM is written, no more samples can be written for that track.

If no explicit BUFFER_FLAG_END_OF_STREAM sample is passed, then the duration of the last sample will be same as that of the sample before that.

const val LAST_SAMPLE_DURATION_BEHAVIOR_SET_TO_ZERO = 0: Int

The duration of the last sample is set to 0.

fun addMetadataEntry(metadataEntry: Metadata.Entry!): Unit

Adds metadata about the output file.

List of supported metadata entries:

• Mp4OrientationData
• Mp4LocationData
• Mp4TimestampData
• MdtaMetadataEntry: Only string type or float type value is supported.
• XmpData

fun addTrack(format: Format!): Muxer.TrackToken!

Adds a track of the given media format.

Tracks can be added at any point before the muxer is closed, even after writing samples to other tracks.

The order of tracks remains same in which they are added.

fun addTrack(sortKey: Int, format: Format!): Muxer.TrackToken!

Adds a track of the given media format.

Tracks can be added at any point before the muxer is closed, even after writing samples to other tracks.

The final order of tracks is determined by the provided sort key. Tracks with a lower sort key will always have a lower track id than tracks with a higher sort key. Ordering between tracks with the same sort key is not specified.

fun close(): Unit

Closes the file.

The muxer cannot be used anymore once this method returns.

fun writeSampleData(
    trackToken: Muxer.TrackToken!,
    byteBuffer: ByteBuffer!,
    bufferInfo: MediaCodec.BufferInfo!
): Unit

Writes encoded sample data.

When sample batching is enabled, provide sample data (ByteBuffer, BufferInfo) that won't be modified after calling the writeSampleData method, unless sample copying is also enabled. This ensures data integrity within the batch. If sample copying is enabled, it's safe to modify the data after the method returns, as the muxer internally creates a sample copy.