Dolby.io's Media APIs are designed for mono and stereo audio either in audio-only or audio+video file formats. The Transcode API supports additional streaming formats and and specific output formats.

Media APIs Input and Output Media Formats

The following Media APIs support the media formats in this table.

Analyze API
Analyze Speech API
Analyze Music API
Audio Diagnose API
Enhance API

Name	Description
AAC	Advanced Audio Coding - .m4a .mp4 .3gp .m4b .aac
HE-AAC	High-Efficiency AAC V1, V2, LC - .m4a .mp4 .3gp .m4b .m4p .m4r .m4v .aac
AIFF IFF	Audio Interchange File Format - .aif .aiff .aifc
AVI	Audio Video Interleave - .avi
MOV	QuickTime File Format - .mov .qt
MP3	MPEG-1, MPEG-2 Audio Layer 3 - .mp3
MP4	MPEG-4 - .mp4 .m4a .m4p .m4b .m4r .m4v
OPUS	.opus
VORBIS	.ogg
WAV	Waveform Audio File Format - .wav

Music Mastering API Input and Output Media Formats

Name	Description
AAC	Advanced Audio Coding - .m4a .mp4 .3gp .m4b .aac
AIFF IFF	Audio Interchange File Format - .aif .aiff .aifc
FLAC	Free Lossless Audio Codec - .flac
MP3	.mp3
OPUS	.opus
VORBIS	.ogg
WAV	Waveform Audio File Format - .wav

Transcode API Output Media Formats

The Transcoding API has a few variations extending support to streaming formats as indicated in this table.

Containers	Video Codecs	Audio Codes	Images	Streaming
AAC ADTS MP3 MP4 OGG WAV	H.264 H.265 VP8 VP9	AAC LC HE-AAC v1 HE-AAC v2 MP3 Opus PCM Vorbis	JPG PNG	HLS DASH

Limitations

If we haven't met your expectations for supported media, use the contact us form and let us know and please share a sample media file with us if you can to review.

Supported File Duration Limits

The following table lists the upper and lower limits for file length. File durations outside of these limits will result in an error.

API	Minimum File Size	Maximum File Size
Enhance	100 ms	N/A
Diagnose	100 ms	14,400 sec (240 min)
Analyze	2 sec	N/A
Analyze Speech	1 sec	N/A
Analyze Music	1 sec	N/A
Transcode	100 ms for audio-only files 500 ms for files that contain video (audio-video files and video-only files)	N/A
Music Mastering	1 sec	600 sec (10 min)