Encapsulates the information describing the format of media data, be it audio or video. The format of the media data is specified as string/value pairs. Keys common to all audio/video formats, all keys not marked optional are mandatory:

Name	Value Type	Description
MediaFormat.KeyMime	String	The type of the format.
MediaFormat.KeyMaxInputSize	Integer	optional, maximum size of a buffer of input data
MediaFormat.KeyBitRate	Integer	encoder-only, desired bitrate in bits/second

Video formats have the following keys:

Name	Value Type	Description
MediaFormat.KeyWidth	Integer
MediaFormat.KeyHeight	Integer
MediaFormat.KeyColorFormat	Integer	set by the user for encoders, readable in the output format of decoders
MediaFormat.KeyFrameRate	Integer or Float	encoder-only
MediaFormat.KeyCaptureRate	Integer
MediaFormat.KeyIFrameInterval	Integer	encoder-only
MediaFormat.KeyMaxWidth	Integer	decoder-only, optional, max-resolution width
MediaFormat.KeyMaxHeight	Integer	decoder-only, optional, max-resolution height
MediaFormat.KeyRepeatPreviousFrameAfter	Long	video encoder in surface-mode only
MediaFormat.KeyPushBlankBuffersOnStop	Integer(1)	video decoder rendering to a surface only

Specify both MediaFormat.KeyMaxWidth and MediaFormat.KeyMaxHeight to enable adaptive playback (seamless resolution change) for a video decoder that supports it (NoType:android/media/MediaCodecInfo$CodecCapabilities;Href=../../../reference/android/media/MediaCodecInfo.CodecCapabilities.html#FEATURE_AdaptivePlayback). The values are used as hints for the codec: they are the maximum expected resolution to prepare for. Depending on codec support, preparing for larger maximum resolution may require more memory even if that resolution is never reached. These fields have no effect for codecs that do not support adaptive playback.



Audio formats have the following keys:

Name	Value Type	Description
MediaFormat.KeyChannelCount	Integer
MediaFormat.KeySampleRate	Integer
MediaFormat.KeyIsAdts	Integer	optional, if decoding AAC audio content, setting this key to 1 indicates that each audio frame is prefixed by the ADTS header.
MediaFormat.KeyAacProfile	Integer	encoder-only, optional, if content is AAC audio, specifies the desired profile.
MediaFormat.KeyAacSbrMode	Integer	encoder-only, optional, if content is AAC audio, specifies the desired SBR mode.
MediaFormat.KeyAacDrcTargetReferenceLevel	Integer	decoder-only, optional, if content is AAC audio, specifies the target reference level.
MediaFormat.KeyAacEncodedTargetLevel	Integer	decoder-only, optional, if content is AAC audio, specifies the target reference level used at encoder.
MediaFormat.KeyAacDrcBoostFactor	Integer	decoder-only, optional, if content is AAC audio, specifies the DRC boost factor.
MediaFormat.KeyAacDrcAttenuationFactor	Integer	decoder-only, optional, if content is AAC audio, specifies the DRC attenuation factor.
MediaFormat.KeyAacDrcHeavyCompression	Integer	decoder-only, optional, if content is AAC audio, specifies whether to use heavy compression.
MediaFormat.KeyAacMaxOutputChannelCount	Integer	decoder-only, optional, if content is AAC audio, specifies the maximum number of channels the decoder outputs.
MediaFormat.KeyChannelMask	Integer	optional, a mask of audio channel assignments
MediaFormat.KeyFlacCompressionLevel	Integer	encoder-only, optional, if content is FLAC audio, specifies the desired compression level.

Subtitle formats have the following keys:

MediaFormat.KeyMime	String	The type of the format.
MediaFormat.KeyLanguage	String	The language of the content.

[Android Documentation]