HTTP Live Streaming (HLS) Authoring Specification for Apple devices appendixes

Overview

The appendixes in this article expand on information provided in the HTTP Live Streaming (HLS) authoring specification for Apple devices. It is not intended as a standalone document.

Testing your streams

Apple provides several command-line tools for HTTP Live Streaming. After signing in with your Apple Developer account, search for http live streaming tools.

To assist in validating your streams, use the command-line tools mediastreamvalidator and hlsreport. While these tools are unable to check everything about your streams, the checks they do are fairly comprehensive and Apple continues to improve the tools.

Check the video quality of your streams by visual inspection. The mediastreamvalidator tool does not check video quality, so check playback of your streams under a variety of network conditions.

Using hlsreport

Use the binary hlsreport to generate an HTML summary report from a JSON file that mediastreamvalidator creates. The report includes several tables with details about variants, renditions, and I-frame variants. Each table entry has a unique stream ID number. A list of issues is included, divided into Must Fix and Should Fix categories according to this specification. The issues cross-reference individual variants and renditions using the unique stream IDs.

The simplest way to call it is:

hlsreport validation_data.json

where validation_data.json is the JSON file that mediastreamvalidator generates. This produces a file called validation_data.html that is the report. You can change the name of the report file with the -o option:

hlsreport -o my_report.html validation_data.json

For further information, see the hlsreport(1) man page.

Declared versus measured values of bandwidths

VOD bit rates are measured over the entirety of the content. Live (linear) bit rates are measured over ~1 hour of content.

Audio compatibility

Additional information about device and audio format compatibility.

See Specs for actual technical specifications.

*Complete support requires iOS 9.3 or tvOS 9.2, or later. Dolby Digital Plus with Dolby Atmos requires tvOS 12.0 or later.

Dolby Digital Plus with Dolby Atmos† requires tvOS 12.0 or later.

APAC support depends on the capability of the actual device and OS version. See APAC specification for support information.

On bit rates for variants

A number of factors affect the bit rate needed to encode video:

• Codec (for example, H.264 or HEVC)

• Specific encoder implementation and features used

• Resolution (for example, 1920 x 1080, 1280 x 720, and so on)

• Frame rate (for example, 24, 25, 30, 50, 60)

• Bits per pixel (for example, HDR typically uses more bits than SDR)

• Complexity of the content

• Desired subjective quality

These factors make universal encoding recommendations for content difficult. HTTP Live Streaming (HLS) authoring specification for Apple devices includes initial bit rate recommendations that you can evaluate against your content, constraints and encoding workflow.

I-frame bit rates versus normal bit rates

The formula in item 6.5 (for I-frame bit rates) in HTTP Live Streaming (HLS) authoring specification for Apple devices requires some explanation.

During trick play, the player tries to deliver eight frames per second. If the playback rate implies a higher frame rate, frames will be dropped to keep the frame rate at eight frames per second. If fewer frames are available, it will play at a lower frame rate.

The I-frame bit rate is the bit rate of the rendition if it were played at normal speed. The I-frame rendition may be 2 fps, 1 fps, 0.5 fps, 0.2 fps, or something else. Let F be the frame rate of the I-frame rendition. Then, 8/F is the multiplier, that is, how much the bit rate is increased by playing the rendition at eight frames per second. The bit rate doesn’t increase by more than this factor because the player can’t play more than eight frames per second.

The I-frame rendition should have an effective bit rate similar to the normal content. So the normal bit rate divided by the multiplier should be the bit rate for the I-frame. Dividing by a fraction is the same as multiplying by its inverse, so the result is 6.5 — the bit rate of a normal playlist of the same resolution times the fps of the I-frame playlist divided by eight.

I-frame image sequences

I-frame image sequences using the mjpg codec have been added to support some third-party devices. The sequences should be low bandwidth and require minimal processing. Players should prefer video I-frame variants over image sequences.

The recommendations for image sequences are as folows:

• Supply a single mjpg variant

• Unencrypted

• 400 pixels wide with height based on the aspect ratio

• One key-frame every 1 to 2 seconds

• Bandwidth should be reasonable for the resolution based on the codec implementation

Audio rendition groups and variants

In building up a multivariant playlist, the first step is to choose your video resolutions and codecs. These are your basic variants. Each one will have a video media playlist. The playlist URI may be repeated in multiple EXT-X-STREAM-INF tags so that the same video can be associated with different audio content.

You will have some set of audio languages and codecs. A particular codec may be in stereo, in 5.1 sound, or both. Create one audio group for each pair of codec and channel count. Each group needs to have every language in it.

When you’re making audio groups, there are some things to remember. First, ensure you have a stereo AAC group. This is good fallback because it’s something all devices can play. If you have multichannel in a lossless audio codec, it’s a good practice to have a multichannel AAC codec as well. Lossless requires a high bit rate. You want something available that has a lower bit rate. During playback you don’t want to switch the number of channels. If playback is in multichannel, you want to stay in multichannel.

Generally speaking, the player doesn’t switch between audio codecs, but there are three notable exceptions. The player switches between the AAC variants: AAC-LC, HE-AAC, HE-AACv2, and USAC (also called xHE-AAC). The player will also switch between lossless codecs and AAC codecs. In addition, when rendering audio to Spatial Audio-capable routes on Apple devices, the player may switch between available audio codecs and even channel layouts.

After you have your audio groups, you replicate the variant entries for each group, with some exceptions. If the codecs are switchable, like the AAC codecs, then you can spread the audio groups across the variants using the low audio bit rate group with the low video bit rates and the high audio bit rate group with the high video. But, if the codecs are not switchable, like AC-3 and lossless, then you want each codec to be associated with every variant. This doesn’t create new variant playlists; it just creates new EXT-X-STREAM-INF tags in the multivariant playlist, which associate a video playlist with an audio group.

You may encounter a problem where the variants you want to favor aren’t being chosen. The default behavior is to choose the highest bit rate among what’s currently playable. With USAC and with Dolby Digital Plus, this can cause an inversion where the chosen variant is not what you would prefer. To remedy this, Apple added the SCORE attribute. The value is a floating-point number. You have to put it on all the variants. If you want to set an order, it has to be complete, otherwise you’ll have situations where you won’t be able to choose. The usual filtering occurs to get down to a set of variants, any of which could be played. At that point, the system uses SCORE to decide and the highest SCORE wins.

Values for the CODECS attribute

Use the CODECS attribute of the EXT-X-STREAM-INF tag (and EXT-X-I-FRAME-STREAM-INF) to specify media sample types. The value is a quoted-string containing a comma-separated list of formats, where each format specifies a media sample type that is present in a media segment of the playlist or in a media segment of some rendition that the tag references.

Valid format identifiers are those in the ISO Base Media File Format Name Space defined by RFC 6381. A format identifier is a sequence of elements separated by periods. The first element is the base sample type. HLS currently recognizes the following values for the base sample types:

The MP4 registration authority (mp4ra.org) lists a value of ec+3 for Enhanced AC-3 audio with JOC (Dolby Atmos) but it has been deprecated now. HLS uses ec-3 and marks the presence of the additional JOC content with JOC in the CHANNELS attribute of the audio rendition. The JOC must be capitalized. For example, CHANNELS="16/JOC". The numeric value should match the value of the complexity_index_type_a field in the EC3SpecificBox of the Dolby Digital Plus audio track.

ALLOWED-CPC values for FairPlay Streaming

The ALLOWED-CPC attribute restricts playback of an encrypted variant stream to devices that guarantee a certain level of content protection robustness. The attribute associates a list of Content Protection Configuration (CPC) Labels with a specific KEYFORMAT value.

The permitted CPC Labels for FairPlay Streaming are:

An example of a valid attribute is: ALLOWED-CPC="com.apple.streamingkeydelivery:AppleMain/Main"

The SUPPLEMENTAL-CODECS attribute

Some codecs are backward-compatible with other codecs. These codecs work by adding metadata that are ignored when being interpreted as the compatible codec, but used by the newer codec. These codecs include Dolby Vision 8.4 and 10.4 (compatible with HLG) and Dolby Vision 8.1 and 10.1 (compatible with HDR10).

To support these codecs on older implementations, the CODECS attribute is used to describe the base layer. The enhanced codec is described in the SUPPLEMENTAL-CODECS attribute. This allows implementations that support SUPPLEMENTAL-CODECS to take advantage of the true codec.

Each element in the SUPPLEMENTAL-CODECS attribute is a slash-separated list of fields. The first field must be a valid CODECS format. If more than one field is present, the remaining fields must be compatibility brands that pertain to that codec’s bitstream.

You can indicate the presence of HDR10+ metadata by adding a brand of ‘cdm4’.

Example-codec-values:

Note that, for Dolby Vision, the compatibility brand and the VIDEO-RANGE attribute act as cross-checks. Leaving out either one is incorrect.

Dim Flashing Lights

Dim Flashing Lights is a setting (see What’s new in Accessibility) that allows people to indicate that they want to avoid bright, frequent flashes of light in video. As an additional measure, content producers can add markers to their HTTP Live Streaming content that identify the regions likely to cause discomfort.

Regions can be signalled using the standard #EXT-X-DATERANGE tag. The CLASS attribute should be set to “com.apple.accessibility.video.strobing.general-flash”. Add an additional X-RISK-LEVEL attribute. The risk level should be a decimal floating-point value in the range 0 to 100, where 0 is minimal risk and 100 is very risky.

To avoid using a large number of regions, restrict risk-level values to a small set of values. Use a risk level of zero for regions that have very low risk. Don’t mark regions with a risk level unless they have been analyzed. Raw risk values can be computed using an algorithm such as VideoFlashingReduction.

The AVPlayerItemMetadataCollector class can be used in your application to fetch the #EXT-X-DATERANGE tag metadata.

If you use the AVKit framework the metadata is fetched for you and the timeline is marked with a reddish color. If you display your own timeline you should do something similar.

Additional spatial video specifications

Video Extended Usage atom ('vexu') is a sample description extension that conveys extensible information about spatial views. For more information, see QuickTime and ISO Base Media File Formats and Spatial and Immersive Media.

Spatial video can benefit from frame based metadata. This can be provided using timed metadata tracks within ISOBMFF (ISO Base Media File Format) or QuickTime files.

You can provide parallax metadata for subtitles or captions using a timed metadata track. This allows control over the depth at which the text is displayed relative to the image. For details, see QuickTime and ISO Base Media File Formats and Spatial and Immersive Media and Video Contour Map Payload Metadata within the QuickTime Movie File Format.

You can provide per frame rectangular mask metadata (PFRM, aka dynamic mask metadata) using a timed metadata track. This is used to indicate a fixed or changing rectangular area extracted from otherwise constant sized decoded video, for example letterboxing, or more complex spatial video adjustments to the displayed area. For details, see Rectangular Mask Payload Metadata within the QuickTime Movie File Format

Immersive video MUST point to an Apple Immersive Media Embedded (AIME) file via EXT-X-SESSION-DATA tag. This file provides information necessary to present the video correctly. To learn more about AIME, see Apple Immersive Media Embedded. See Apple Immersive Video Utility User Guide for more information.

Immersive video SHOULD use Apple Positional Audio Codec (APAC) for audio codec. APAC provides rich spatial audio experience. To learn more about APAC, see APAC.

For more information on encoding MV-HEVC video, see Apple HEVC Stereo Video.

You can find also find these resources listed at AVFoundation Overview.

Requirements for downloading and persisting HLS streams

Multivariant Playlist and its resources expiry requirements

Content providers MUST assure that the original Multivariant Playlist URL and its resources do not expire on the CDN, as long as the downloaded asset will be needed by the application. There are 3 reasons.

• (Online playback) While online the player may attempt to load additional resources from the MVP (for assuring compatibility when the device configuration changes, e.g., an external display adapter is connected), which could cause playback to fail or misbehave if the MVP (or its resources) is no longer available from the network.

• (Supplementary downloads) If the app explicitly initiates supplementary download of variants and renditions to an existing movpkg location, the download operation will fail if the Multivariant Playlist URL or its resources have expired on the CDN.

• (AirPlay) When AirPlay-ing a downloaded HLS content, the AirPlay receiver will attempt to load the original Multivariant Playlist URL, which should remain available for as long as the download can be persisted on the sender device.

Content Steering requirements

• If the content supports Content Steering, Media Playlists MUST include STABLE-RENDITION-ID & STABLE-VARIANT-ID attributes; this decouples the variant identity from its CDN location.

• If one Media Playlist includes a STABLE-RENDITION-ID or STABLE-VARIANT-ID, all other Media Playlists MUST also specify a stable ID.

• The Content Steering manifest MUST remain available for the same timespan as the Multivariant Playlist URL above for the same reasons.

Interstitials requirements

• Your ads and other non-primary media MAY be inserted in the Media Playlists or as Interstitials.

• To allow predictable tier selection at the time of download, interstitial assets SHOULD follow the content structure of the main content (e.g., Codecs, subtitle/audio languages, etc.,).

Download performance requirements

• Download speed will be improved by authoring content in a way that reduces the total number of HTTP requests, and specifically the requests that have a short payload. HLS content intended for download SHOULD be encapsulated as fMP4 or elementary audio stream, and consecutive segments in Media Playlists use EXT-X-BYTERANGE attributes with contiguous ranges; this allows the number of HTTP requests to be reduced via coalescing. Content SHOULD also avoid usage of small files, where possible. For instance, subtitles can be authored as a single segment for all cues across the entire asset duration.

• Extra-long-form content, such as audiobooks, SHOULD be split in multiple assets (e.g., per chapter). This is particularly important for playback of downloaded audio assets on watchOS, to enable performant playback start-up and reduce battery usage.

Example playlists

Example playlist with Stereo video.

#EXTM3U
#EXT-X-VERSION:12
#EXT-X-INDEPENDENT-SEGMENTS

#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="ac3-48-384",NAME="English",LANGUAGE="en-US",AUTOSELECT=YES,DEFAULT=YES,CHANNELS="6",URI="audio/prog_index.m3u8"

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=726521,BANDWIDTH=910558,VIDEO-RANGE=PQ,CODECS="dvh1.20.01,ac-3",RESOLUTION=640x360,FRAME-RATE=24.000,CLOSED-CAPTIONS=NONE,AUDIO="ac3-48-384",REQ-VIDEO-LAYOUT="CH-STEREO"
360p/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=7224756,BANDWIDTH=10079102,VIDEO-RANGE=PQ,CODECS="dvh1.20.01,ec-3",RESOLUTION=1280x720,FRAME-RATE=24.000,CLOSED-CAPTIONS=NONE,AUDIO="atmos-48-448",REQ-VIDEO-LAYOUT="CH-STEREO"
720p/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=12327020,BANDWIDTH=17120478,VIDEO-RANGE=PQ,CODECS="dvh1.20.03,ec-3",RESOLUTION=1920x1080,FRAME-RATE=24.000,CLOSED-CAPTIONS=NONE,AUDIO="atmos-48-448",REQ-VIDEO-LAYOUT="CH-STEREO"
1080p/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=16683700,BANDWIDTH=23228969,VIDEO-RANGE=PQ,CODECS="dvh1.20.05,ac-3",RESOLUTION=2560x1440,FRAME-RATE=24.000,CLOSED-CAPTIONS=NONE,AUDIO="ac3-48-384",REQ-VIDEO-LAYOUT="CH-STEREO"
1440p/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=34515644,BANDWIDTH=47959720,VIDEO-RANGE=PQ,CODECS="dvh1.20.06,ac-3",RESOLUTION=3840x2160,FRAME-RATE=24.000,CLOSED-CAPTIONS=NONE,AUDIO="ac3-48-384",REQ-VIDEO-LAYOUT="CH-STEREO"
2160p/prog_index.m3u8

Example playlist with APMP video.

#EXTM3U
#EXT-X-VERSION:12
#EXT-X-INDEPENDENT-SEGMENTS

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=25403063,BANDWIDTH=34135166,VIDEO-RANGE=SDR,CODECS="hvc1.2.20000000.H150.B0",RESOLUTION=3840x1920,FRAME-RATE=29.970,CLOSED-CAPTIONS=NONE,REQ-VIDEO-LAYOUT="CH-STEREO/PROJ-EQUI"
small/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=50285525,BANDWIDTH=65273029,VIDEO-RANGE=SDR,CODECS="hvc1.2.20000000.H180.B0",RESOLUTION=5440x2720,FRAME-RATE=29.970,CLOSED-CAPTIONS=NONE,REQ-VIDEO-LAYOUT="CH-STEREO/PROJ-EQUI"
med/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=102904567,BANDWIDTH=117277565,VIDEO-RANGE=SDR,CODECS="hvc1.2.20000000.H180.B0",RESOLUTION=7680x3840,FRAME-RATE=29.970,CLOSED-CAPTIONS=NONE,REQ-VIDEO-LAYOUT="CH-STEREO/PROJ-EQUI"
large/prog_index.m3u8

#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=1787583,BANDWIDTH=2559008,VIDEO-RANGE=SDR,CODECS="hvc1.2.20000000.H150.B0",RESOLUTION=3840x1920,REQ-VIDEO-LAYOUT="CH-MONO/PROJ-RECT",URI="small/iframe_var.m3u8"

#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=3121560,BANDWIDTH=4464969,VIDEO-RANGE=SDR,CODECS="hvc1.2.20000000.H180.B0",RESOLUTION=5440x2720,REQ-VIDEO-LAYOUT="CH-MONO/PROJ-RECT",URI="med/iframe_var.m3u8"

#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=5070173,BANDWIDTH=6906054,VIDEO-RANGE=SDR,CODECS="hvc1.2.20000000.H180.B0",RESOLUTION=7680x3840,REQ-VIDEO-LAYOUT="CH-MONO/PROJ-RECT",URI="large/iframe_var.m3u8"

Example playlist with AIV video.

#EXTM3U
#EXT-X-VERSION:12
#EXT-X-INDEPENDENT-SEGMENTS

#EXT-X-SESSION-DATA:DATA-ID="com.apple.hls.venue-description",URI="sample.aime"

#== AUDIO
#EXT-X-MEDIA:TYPE=AUDIO,LANGUAGE="en",GROUP-ID="apac",NAME="English",DEFAULT=YES,CHANNELS="20/3OA/BED-4",CHARACTERISTICS="public.original-content",URI="Audio/audio_index.m3u8"

#-- subtitles --
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",LANGUAGE="en",NAME="English",AUTOSELECT=NO,FORCED=NO,URI="Subtitles/en/en_index.m3u8"

#== VIDEO - Stereo MV-HEVC
#EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="stereo-16",NAME="Director's Cut",DEFAULT=YES,CHARACTERISTICS="com.apple.position.dirs-cut",URI="Video/16Mb/prog_index.m3u8"
#EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="stereo-20",NAME="Director's Cut",DEFAULT=YES,CHARACTERISTICS="com.apple.position.dirs-cut",URI="Video/20Mb/prog_index.m3u8"
#EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="stereo-40",NAME="Director's Cut",DEFAULT=YES,CHARACTERISTICS="com.apple.position.dirs-cut",URI="Video/40Mb/prog_index.m3u8"
#EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="stereo-50",NAME="Director's Cut",DEFAULT=YES,CHARACTERISTICS="com.apple.position.dirs-cut",URI="Video/50Mb/prog_index.m3u8"
#EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="stereo-100",NAME="Director's Cut",DEFAULT=YES,CHARACTERISTICS="com.apple.position.dirs-cut",URI="Video/100Mb/prog_index.m3u8"


#== Variants
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=18077520,BANDWIDTH=30636545,AUDIO="apac",SUBTITLES="subs",VIDEO="stereo-16",VIDEO-RANGE=PQ,CODECS="hvc1.2.20000000.H183.B0,apac.31.00",RESOLUTION=3600x3600,FRAME-RATE=90.000,CLOSED-CAPTIONS=NONE,REQ-VIDEO-LAYOUT="CH-STEREO/PROJ-AIV"
Video/16Mb/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=21960196,BANDWIDTH=36415190,AUDIO="apac",SUBTITLES="subs",VIDEO="stereo-20",VIDEO-RANGE=PQ,CODECS="hvc1.2.20000000.H183.B0,apac.31.00",RESOLUTION=3600x3600,FRAME-RATE=90.000,CLOSED-CAPTIONS=NONE,REQ-VIDEO-LAYOUT="CH-STEREO/PROJ-AIV"
Video/20Mb/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=41505403,BANDWIDTH=71521624,AUDIO="apac",SUBTITLES="subs",VIDEO="stereo-40",VIDEO-RANGE=PQ,CODECS="hvc1.2.20000000.H183.B0,apac.31.00",RESOLUTION=4320x4320,FRAME-RATE=90.000,CLOSED-CAPTIONS=NONE,REQ-VIDEO-LAYOUT="CH-STEREO/PROJ-AIV"
Video/40Mb/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=98690153,BANDWIDTH=177339446,AUDIO="apac",SUBTITLES="subs",VIDEO="stereo-100",VIDEO-RANGE=PQ,CODECS="hvc1.2.20000000.H183.B0,apac.31.00",RESOLUTION=4320x4320,FRAME-RATE=90.000,CLOSED-CAPTIONS=NONE,REQ-VIDEO-LAYOUT="CH-STEREO/PROJ-AIV"
Video/100Mb/prog_index.m3u8

Example playlist with SDR, Dolby Vision, HDR10, and HLG content at resolutions from 720p to 4K

The SUPPLEMENTAL-CODECS attribute is used to indicate that the HDR10 content is compatible with Dolby Vison 8.1 and the HLG content is compatible with Dolby Vision 8.4.

#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=2778321,BANDWIDTH=3971374,VIDEO-RANGE=SDR,CODECS="hvc1.2.4.L123.B0",RESOLUTION=1280x720,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=NONE
sdr_720/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=6759875,BANDWIDTH=10022043,VIDEO-RANGE=SDR,CODECS="hvc1.2.4.L123.B0",RESOLUTION=1920x1080,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=TYPE-0
sdr_1080/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=20985770,BANDWIDTH=28058971,VIDEO-RANGE=SDR,CODECS="hvc1.2.4.L150.B0",RESOLUTION=3840x2160,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=TYPE-1
sdr_2160/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=3385450,BANDWIDTH=5327059,VIDEO-RANGE=PQ,CODECS="dvh1.05.01",RESOLUTION=1280x720,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=NONE
dolby_720/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=7999361,BANDWIDTH=12876596,VIDEO-RANGE=PQ,CODECS="dvh1.05.03",RESOLUTION=1920x1080,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=TYPE-0
dolby_1080/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=24975091,BANDWIDTH=30041698,VIDEO-RANGE=PQ,CODECS="dvh1.05.06",RESOLUTION=3840x2160,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=TYPE-1
dolby_2160/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=3320040,BANDWIDTH=5280654,VIDEO-RANGE=PQ,CODECS="hvc1.2.4.L123.B0",SUPPLEMENTAL-CODECS="dvh1.08.01/db1p",RESOLUTION=1280x720,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=NONE
hdr10_dolby_720/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=7964551,BANDWIDTH=12886714,VIDEO-RANGE=PQ,CODECS="hvc1.2.4.L123.B0",SUPPLEMENTAL-CODECS="dvh1.08.03/db1p",RESOLUTION=1920x1080,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=TYPE-0
hdr10_dolby_1080/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=24833402,BANDWIDTH=29983769,VIDEO-RANGE=PQ,CODECS="hvc1.2.4.L150.B0",SUPPLEMENTAL-CODECS="dvh1.08.08/db1p",RESOLUTION=3840x2160,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=TYPE-1
hdr10_dolby_2160/prog_index.m3u8

#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=3061873,BANDWIDTH=3109758,VIDEO-RANGE=HLG,CODECS="hvc1.2.20000000.L150.B0",SUPPLEMENTAL-CODECS="dvh1.08.01/db4h",RESOLUTION=1280x720,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=NONE
hlg_dolby_720_24/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=6759750,BANDWIDTH=6884346,VIDEO-RANGE=HLG,CODECS="hvc1.2.20000000.L153.B0",SUPPLEMENTAL-CODECS="dvh1.08.03/db4h",RESOLUTION=1920x1080,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=TYPE-0
hlg_dolby_1080_30/prog_index.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=26472863,BANDWIDTH=28111779,VIDEO-RANGE=HLG,CODECS="hvc1.2.20000000.L183.B0",SUPPLEMENTAL-CODECS="dvh1.08.08/db4h",RESOLUTION=3840x2160,FRAME-RATE=23.976,CLOSED-CAPTIONS=NONE,HDCP-LEVEL=TYPE-1
hlg_dolby_2160_60/prog_index.m3u8

#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=248586,BANDWIDTH=593626,VIDEO-RANGE=SDR,CODECS="hvc1.2.4.L123.B0",RESOLUTION=1280x720,HDCP-LEVEL=NONE,URI="sdr_720/iframe_index.m3u8"
#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=399790,BANDWIDTH=956552,VIDEO-RANGE=SDR,CODECS="hvc1.2.4.L123.B0",RESOLUTION=1920x1080,HDCP-LEVEL=TYPE-0,URI="sdr_1080/iframe_index.m3u8"
#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=826971,BANDWIDTH=1941397,VIDEO-RANGE=SDR,CODECS="hvc1.2.4.L150.B0",RESOLUTION=3840x2160,HDCP-LEVEL=TYPE-1,URI="sdr_2160/iframe_index.m3u8"

#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=232253,BANDWIDTH=573073,VIDEO-RANGE=PQ,CODECS="dvh1.05.01",RESOLUTION=1280x720,HDCP-LEVEL=NONE,URI="dolby_720/iframe_index.m3u8"
#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=365337,BANDWIDTH=905037,VIDEO-RANGE=PQ,CODECS="dvh1.05.03",RESOLUTION=1920x1080,HDCP-LEVEL=TYPE-0,URI="dolby_1080/iframe_index.m3u8"
#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=739114,BANDWIDTH=1893236,VIDEO-RANGE=PQ,CODECS="dvh1.05.06",RESOLUTION=3840x2160,HDCP-LEVEL=TYPE-1,URI="dolby_2160/iframe_index.m3u8"

#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=232511,BANDWIDTH=572673,VIDEO-RANGE=PQ,CODECS="hvc1.2.4.L123.B0",SUPPLEMENTAL-CODECS="dvh1.08.01/db1p",RESOLUTION=1280x720,HDCP-LEVEL=NONE,URI="hdr10_dolby_720/iframe_index.m3u8"
#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=364552,BANDWIDTH=905053,VIDEO-RANGE=PQ,CODECS="hvc1.2.4.L123.B0",SUPPLEMENTAL-CODECS="dvh1.08.03/db1p",RESOLUTION=1920x1080,HDCP-LEVEL=TYPE-0,URI="hdr10_dolby_1080/iframe_index.m3u8"
#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=739757,BANDWIDTH=1895477,VIDEO-RANGE=PQ,CODECS="hvc1.2.4.L150.B0",SUPPLEMENTAL-CODECS="dvh1.08.08/db1p",RESOLUTION=3840x2160,HDCP-LEVEL=TYPE-1,URI="hdr10_dolby_2160/iframe_index.m3u8"

#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=214431,BANDWIDTH=337245,VIDEO-RANGE=HLG,CODECS="hvc1.2.20000000.L150.B0",SUPPLEMENTAL-CODECS="dvh1.08.01/db4h",RESOLUTION=1280x720,HDCP-LEVEL=NONE,URI="hlg_dolby_720/prog_index.m3u8"
#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=309406,BANDWIDTH=483498,VIDEO-RANGE=HLG,CODECS="hvc1.2.20000000.L153.B0",SUPPLEMENTAL-CODECS="dvh1.08.03/db4h",RESOLUTION=1920x1080,HDCP-LEVEL=TYPE-0,URI="hlg_dolby_1080/prog_index.m3u8"
#EXT-X-I-FRAME-STREAM-INF:AVERAGE-BANDWIDTH=788595,BANDWIDTH=1777136,VIDEO-RANGE=HLG,CODECS="hvc1.2.20000000.L183.B0",SUPPLEMENTAL-CODECS="dvh1.08.08/db4h",RESOLUTION=3840x2160,HDCP-LEVEL=TYPE-1,URI="hlg_dolby_2160/prog_index.m3u8"

The HEVC codec values are described in ISO/IEC 14496-15. A short description is Codec.Profile.Flags.TierLevel.Constraints, so in hvc1.2.4.L123.B0, the 2 means Main 10 profile, and the L123 means normal tier, level 4.1.

Information about Dolby Video codec values can be obtained from Dolby. A short description is Codec.Profile.Level, so in dvh1.05.03 the Profile is 5 and the Level is 3.