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Media Specification

Media streaming

Transport protocols


  • HTTP or HTTPS using HTTP protocol v1.1 and Range requests.

  • Transport Layer Security (TLS) version 1.2 with forward security.

  • TLS key support 2048 bits for RSA and 256 bits for EC.

  • TLS does not use any known insecure cryptographic primitives (e.g., RC4 encryption, SHA-1 certificate signatures).


Progressive download


Progressive download of video and audio is supported but below notes apply:

  • Content which is protected with DRM not supported via progressive download

  • In-band subtitles not supported via progressive download

  • Exception is Out-of-band subtitles, because they are supported with both streaming and download as they are handled outside of the media scope

Following combinations are supported:


ContainerAudio codecsVideo codecsDRMDRM triggerIn-band subtitles
ISO BMFF

AAC-LC

HE-AAC v1

HE-AAC v2

MP3

Dolby AC3

Dolby AC4

Dolby E-AC-3

H.264

H.265

NoneNoneNot supported
MPEG2-TS

AAC-LC

HE-AAC v1

HE-AAC v2

MP3

Dolby AC3

Dolby AC4

Dolby E-AC-3

H.264NoneNoneNot supported
WebMOpusVP9NoneNoneNot supported

ADTS / AAC

MP3

AAC-LC

HE-AAC v1

HE-AAC v2

MP3

NoneNoneNoneNot supported


Adaptive Bitrate streaming protocols


The following Adaptive Bitrate (ABR) streaming protocols MUST be supported:


Streaming TypeMIME-TypesNotes
Apple HTTP Live Streaming (HLS)

application/vnd.apple.mpegurl

application/x-mpegURL

VoD (append-mode window) and Event (sliding window)
MPEG-DASHapplication/dash+xmlMain and Live profiles of MPEG-DASH
Microsoft Smooth Streaming (MSS)

application/vnd.ms-sstr+xml

application/vnd.ms-playready.initiator+xml



Apple HTTP Live Streaming (HLS)


We support HTTP Live Streaming Protocol version 3, both Live and On-Demand streams. 

Support for the following M3U8 playlist tags is available:

#EXTM3U

#EXTINF

#EXT-X-TARGETDURATION

#EXT-X-MEDIA-SEQUENCE

#EXT-X-KEY

#EXT-X-ENDLIST

#EXT-X-STREAM-INF

#EXT-X-DISCONTINUITY

#EXT-X-VERSION


ContainerAudio codecs

Video codecs

EncryptionDecryption triggerIn-band subtitles
MPEG2-TS

AAC-LC

HE-AAC v1

HE-AAC v2

MP3

Dolby AC3

Dolby AC4

Dolby E-AC-3


H.264

H.265

None
Not supported
MPEG2-TS

AAC-LC

HE-AAC v1

HE-AAC v2

MP3

Dolby AC3

Dolby AC4

Dolby E-AC-3

H.264

H.265

AES-128ManifestNot supported
ADTS

AAC-LC

HE-AAC v1

HE-AAC v2

NoneNone
Not supported
ADTS

AAC-LC

HE-AAC v1

HE-AAC v2

NoneAES-128ManifestNot supported
MP3MP3NoneNone
Not supported
MP3MP3NoneAES-128ManifestNot supported


Restrictions for HLS content


Below is the list of limitations :


ParameterRequirements
Frame rateUp to 60fps
Audio sampling rateUp to 48000 Hz
Number of audio channelsUp to 8 (7+LFE)
Media segment file sizeUp to 15MB
Segment durationIn range 1s - 12s
Average bitrate over one segmentUp to 8 Mbit/s (for up to 1080p)
Manifest file sizeUp to 2MB
Number of tracks in one M3U8 manifest fileUp to 36


MPEG-DASH


The following combinations of containers and codecs can be used for MPEG-DASH profiles:


ContainerAudio codecsVideo codecsDRMDRM TriggerIn-band subtitles
ISO BMFF

AAC-LC

HE-AAC v1

HE-AAC v2

MP3

Dolby AC3

Dolby AC4

Dolby E-AC-3

H.264

H.265

NoneNoneSupported
ISO BMFF

AAC-LC

HE-AAC v1

HE-AAC v2

MP3

Dolby AC3

Dolby AC4

Dolby E-AC-3

H.264

H.265

ClearKey

PlayReady


EME
Supported


ProfileIdentifier
ISO Base Media File Format Liveurn:mpeg:dash:profile:isoff-live:2011
ISO Base Media File Format Mainurn:mpeg:dash:profile:isoff-main:2011
DASH-AVC/264

urn:com:dashif:dash264

http://dashif.org/guidelines/dash264

DASH-AVC/264 SDhttp://dashif.org/guidelines/dash264#sd
DASH-AVC/264 HDhttp://dashif.org/guidelines/dash264#hd
DASH-AVC/264 Mainhttp://dashif.org/guidelines/dash264main
DASH-AVC/264 Livehttp://dashif.org/guidelines/dash264live


Restrictions for MPEG-DASH content


Below is the list of limitations :


ParameterRequirements
Frame rateUp to 60fps
Audio sampling rateUp to 48000 Hz
Number of audio channelsUp to 8 (7+LFE)
Media segment file sizeUp to 15MB
Segment durationIn range 1s - 12s
Average bitrate over one segmentUp to 8 Mbit/s (for up to 1080p)
Manifest file sizeUp to 2MB
Number of tracks in one MPD fileUp to 36


Microsoft Smooth Streaming (MSS)


Microsoft Smooth Streaming Transport Protocol v2.2, both Live and On-Demand streams.

The following combinations of containers and codecs can be used:


ContainerAudio codecsVideo codecsDRMDRM TriggerIn-band subtitles
PIFF v1.1

AAC-LC

HE-AAC v1

HE-AAC v2

H.264NoneNone
Supported
PIFF v1.1

AAC-LC

HE-AAC v1

HE-AAC v2

H.264PlayReadyManifestSupported
PIFF v1.1

AAC-LC

HE-AAC v1

HE-AAC v2

H.264PlayReadyWebInitiatorSupported


Restrictions for Smooth Streaming content


Below is the list of limitations :


ParameterRequirements
Frame rateUp to 60fps
Audio sampling rateUp to 48000 Hz
Number of audio channelsUp to 8 (7+LFE)
Media segment file sizeUp to 15MB
Segment durationIn range 1s - 12s
Average bitrate over one segmentUp to 8 Mbit/s (for up to 1080p)
Manifest file sizeUp to 2MB



Media Source Extensions (MSE)


Media Source Extensions is supported according to the MSE specification. 

The following combinations of containers and codecs can be used:


ContainerAudio codecsVideo codecs
MP4AAC / MP3
H.264 / H.265
WebMOpusVP9
MP4AAC / MP3<no video>
WebMOpus<no video>
MP4<no audio>H.264 / H.265
WebM<no audio>VP9
MP4<no audio>AV1
MP4AAC / MP3AV1



Subtitles and Closed Captioning


To display subtitles or Closed Captions, the apps can use WebVTT to the extent that it is supported by the Chromium engine, and MUST support the EBU-TT-D text track profile, which is a subset of the TTML text track format.


Apps can use in-band and out-of-band subtitles (text tracks) according to the table below:


Media delivery methodIn-band subtitlesOut-of-band subtitles
Progressive playbackNot supportedSupported
HLS
Not supportedSupported
MPEG-DASHSupportedSupported
Smooth StreamingSupportedSupported
MSE
Not supportedSupported


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