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Dream 4K · Guide & information

Streaming technology reference

Clear explanations of media delivery, playlists, codecs and network evidence.

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80 guides in this collection.

Adaptive bitrate selection — illustrated reference table

Adaptive bitrate selection

Understand how a player can choose among compatible encoded alternatives without creating new source detail.

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Audio channel count and layout — illustrated reference table

Audio channel count and layout

Understand why the number of channels does not fully describe their positions or correct speaker mapping.

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Audio passthrough and player decoding — illustrated reference table

Audio passthrough and player decoding

Understand the difference between forwarding supported encoded audio and sending decoded PCM to an endpoint.

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Audio sample rate — illustrated reference table

Audio sample rate

Understand samples per second, resampling and why hertz are different from a compressed audio bit rate.

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AV1 video coding — illustrated reference table

AV1 video coding

Understand AV1 configuration, profiles and the difference between an open specification and actual playback support.

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Browser media error codes — illustrated reference table

Browser media error codes

Read the four MediaError categories without treating them as exact root-cause diagnoses.

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Buffered time ranges in a video player — illustrated reference table

Buffered time ranges in a video player

Understand why buffered media can consist of several separate intervals and how to find the playable range ahead.

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Browser canPlayType format hints — illustrated reference table

Browser canPlayType format hints

Understand what canPlayType can say about a MIME/codec description and why it is not a complete playback test.

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Captions and dialogue subtitles — illustrated reference table

Captions and dialogue subtitles

Understand the information carried by accessibility captions compared with dialogue-only subtitles.

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Codecs and containers — illustrated reference table

Codecs and containers

Distinguish compressed audio/video formats from the file or segment structure that carries them.

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Codec profiles and levels — illustrated reference table

Codec profiles and levels

Understand feature-set and operating-limit declarations without treating a codec family as one uniform decoder requirement.

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Codec strings in streaming metadata — illustrated reference table

Codec strings in streaming metadata

Understand why avc1, hvc1, av01 and related declarations need to be preserved exactly in a compatibility report.

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Cross-origin media requests and CORS — illustrated reference table

Cross-origin media requests and CORS

Understand why a URL opening directly does not prove a web player may read it through JavaScript.

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DASH and the MPD manifest — illustrated reference table

DASH and the MPD manifest

Understand the presentation hierarchy in a DASH manifest and the separate resources needed for playback.

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DASH Period boundaries — illustrated reference table

DASH Period boundaries

Understand presentation intervals and the context a player must handle when moving between DASH Periods.

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DASH representations and adaptation sets — illustrated reference table

DASH representations and adaptation sets

Distinguish an encoded representation from the group that organizes related track choices.

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DASH SegmentTimeline and timescale — illustrated reference table

DASH SegmentTimeline and timescale

Understand integer sample-time units and their mapping to the presentation timeline.

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DHCP and IPv4 link-local addresses — illustrated reference table

DHCP and IPv4 link-local addresses

Understand automatic configuration and what a 169.254 address does and does not show.

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DNS in a streaming request — illustrated reference table

DNS in a streaming request

Understand name resolution, cached answers and why changing DNS is not a universal buffering repair.

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Dropped video frames — illustrated reference table

Dropped video frames

Understand render counters, interval measurements and why frame drops are different from a media buffer running empty.

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Encoded video bit rate — illustrated reference table

Encoded video bit rate

Understand encoded data per unit of media time and distinguish average rate, peaks and delivery throughput.

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Ethernet link speed and negotiation — illustrated reference table

Ethernet link speed and negotiation

Understand a negotiated local link rate without treating it as a complete internet or video-quality measurement.

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FLAC lossless audio — illustrated reference table

FLAC lossless audio

Understand lossless sample preservation without assuming the source was perfect or every playback path is bit exact.

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Frame reordering and decode order — illustrated reference table

Frame reordering and decode order

Understand why encoded packet order can differ from the order in which pictures are presented.

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GOP structure and media boundaries — illustrated reference table

GOP structure and media boundaries

Understand encoded picture grouping without equating GOP length with segment duration or live delay.

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H.264 and AVC — illustrated reference table

H.264 and AVC

Understand H.264 as a video coding family and identify the information needed beyond its familiar name.

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HDR transfer signalling: PQ and HLG — illustrated reference table

HDR transfer signalling: PQ and HLG

Understand why HDR requires a correctly interpreted image system rather than only a bright picture or codec label.

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HEVC and H.265 — illustrated reference table

HEVC and H.265

Understand HEVC as a codec family without confusing it with 4K resolution, HDR or a universal device capability.

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Alternate audio in HLS — illustrated reference table

Alternate audio in HLS

Understand audio rendition groups, language metadata and why the selected video variant does not fully describe sound.

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HLS blocking playlist reload — illustrated reference table

HLS blocking playlist reload

Understand a request held for a newer playlist state and why pending can be intentional.

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HLS byte-range segments — illustrated reference table

HLS byte-range segments

Understand how several HLS segments can occupy different byte ranges of one HTTP resource.

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HLS discontinuity boundaries — illustrated reference table

HLS discontinuity boundaries

Understand why an HLS timeline can need an explicit boundary when timestamps, formats or track structure change.

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HLS ENDLIST and completed presentations — illustrated reference table

HLS ENDLIST and completed presentations

Understand what EXT-X-ENDLIST says about future segments and why completion differs from a delivery error.

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The HLS live playlist window — illustrated reference table

The HLS live playlist window

Understand the difference between currently advertised live media, a playback buffer and a replay entitlement.

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HLS media playlists — illustrated reference table

HLS media playlists

Understand how an HLS media playlist describes a timeline, including durations, sequence numbers and resource locations.

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HLS media segments

Understand segment duration, payload resources and the difference between media time and transfer time.

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HLS media sequence numbers

Understand segment numbering, playlist updates and why sequence numbers are not timestamps.

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HLS multivariant playlists — illustrated reference table

HLS multivariant playlists

Read an HLS variant menu without confusing resolution, audio groups or advertised bandwidth with a playback measurement.

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HLS partial segments — illustrated reference table

HLS partial segments

Understand smaller live-edge media units and their relationship to a completed parent segment.

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HLS preload hints — illustrated reference table

HLS preload hints

Understand anticipated resources and why a hint is different from a confirmed partial-segment entry.

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HLS programme date time — illustrated reference table

HLS programme date time

Understand the informative wall-clock mapping in EXT-X-PROGRAM-DATE-TIME without assuming it records camera capture.

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HLS target duration — illustrated reference table

HLS target duration

Understand EXT-X-TARGETDURATION as a playlist constraint rather than a latency promise.

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HTTP caching for video resources — illustrated reference table

HTTP caching for video resources

Understand stored responses, freshness and validation without confusing cache lifetime with media retention.

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Conditional requests and 304 responses — illustrated reference table

Conditional requests and 304 responses

Understand validators and why Not Modified can be a successful cache-validation outcome.

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HTTP Live Streaming explained — illustrated reference table

HTTP Live Streaming explained

Understand the HLS request chain, adaptation choices and the boundaries of an HLS compatibility claim.

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HTTP redirects in media delivery — illustrated reference table

HTTP redirects in media delivery

Understand intermediate responses, final destinations and why a successful redirect is not the same as a successful media response.

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HTTP response status in streaming — illustrated reference table

HTTP response status in streaming

Use response codes to distinguish access, resource, rate-limit and availability outcomes without treating every failure as a server outage.

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Initialization segments in fragmented MP4 — illustrated reference table

Initialization segments in fragmented MP4

Understand why fragmented media may need initialization data before its audio or video samples can be decoded.

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IPv6 and dual-stack streaming paths — illustrated reference table

IPv6 and dual-stack streaming paths

Understand why IPv4 and IPv6 reachability can differ without treating either family as a universal speed fix.

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Keyframes and random access in video — illustrated reference table

Keyframes and random access in video

Understand decoder entry points and why an arbitrary video position may need earlier media.

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Live edge and playback position — illustrated reference table

Live edge and playback position

Understand how client position relates to available media and timing cushion without promising a universal latency value.

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Low-Latency HLS — illustrated reference table

Low-Latency HLS

Understand LL-HLS as a coordinated publishing and delivery extension rather than a universal player speed switch.

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Media capabilities and decoding configuration — illustrated reference table

Media capabilities and decoding configuration

Understand supported, smooth and powerEfficient as separate browser-reported properties for a specified media configuration.

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Mesh backhaul and client signal — illustrated reference table

Mesh backhaul and client signal

Understand the separate link from a device to a mesh point and the link that connects the point upstream.

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NAT and streaming connections — illustrated reference table

NAT and streaming connections

Understand address translation and distinguish ordinary outbound playback from inbound connection requirements.

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Network jitter and delay variation — illustrated reference table

Network jitter and delay variation

Understand arrival-time variation and why a single ping or average delay cannot describe it.

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Network latency for streaming — illustrated reference table

Network latency for streaming

Understand one-way delay, round-trip time and why low ping does not guarantee fast video delivery.

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Opus audio coding — illustrated reference table

Opus audio coding

Understand Opus as a speech and music codec, separate from its container and delivery protocol.

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Packet loss and streaming evidence — illustrated reference table

Packet loss and streaming evidence

Understand what a packet-loss measurement covers and why a missing ping response does not directly diagnose a video stall.

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Path MTU and media transport — illustrated reference table

Path MTU and media transport

Understand packet-size limits and why small successful requests do not fully test a large-data path.

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PCM audio and decoded output — illustrated reference table

PCM audio and decoded output

Understand pulse-code sample representation, multichannel PCM and the limits of a receiver’s format display.

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Queue delay and bufferbloat — illustrated reference table

Queue delay and bufferbloat

Understand how a busy connection can add delay even when data continues to transfer at a high rate.

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QUIC streams and HTTP media — illustrated reference table

QUIC streams and HTTP media

Understand reliable per-stream delivery over QUIC and why UDP-based transport does not imply unreliable HTTP video.

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Seekable time ranges — illustrated reference table

Seekable time ranges

Understand the positions a player currently considers seekable and why they can differ from buffered data.

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Source frame rate and display refresh rate — illustrated reference table

Source frame rate and display refresh rate

Distinguish encoded frame cadence from the display signal and understand why an integer match can matter.

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Throughput and network capacity — illustrated reference table

Throughput and network capacity

Distinguish an access-link capacity label from the useful data rate achieved by a particular media transfer.

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Subtitle cue timing — illustrated reference table

Subtitle cue timing

Understand cue intervals, constant offsets and accumulating drift on a media timeline.

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TCP reliability and streaming — illustrated reference table

TCP reliability and streaming

Understand reliable ordered bytes, retransmission and why recovered data can still arrive too late for smooth playback.

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TLS certificate identity in media delivery — illustrated reference table

TLS certificate identity in media delivery

Understand hostname trust checks and why an HTTPS certificate error should be investigated rather than bypassed.

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UDP and media transport — illustrated reference table

UDP and media transport

Understand datagram delivery and why applications above UDP can have different reliability and timing behavior.

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Variable video bit rate

Understand unequal encoded segment sizes without assuming the network changed or the source is defective.

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Video aspect ratio and picture shape — illustrated reference table

Video aspect ratio and picture shape

Understand display shape, pixel shape and why black bars can preserve correct geometry.

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Video bit depth — illustrated reference table

Video bit depth

Understand quantization levels without confusing bit depth with bit rate, resolution or an HDR guarantee.

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Video colour range: full and limited — illustrated reference table

Video colour range: full and limited

Understand code-range interpretation and why matching both ends matters more than choosing a universally superior label.

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Video resolution and source detail — illustrated reference table

Video resolution and source detail

Understand pixel dimensions without treating a resolution label as a complete picture-quality measurement.

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WebVTT text tracks — illustrated reference table

WebVTT text tracks

Understand WebVTT structure, UTF-8 encoding and cue-based timing in web video.

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Wi-Fi bands and channel width — illustrated reference table

Wi-Fi bands and channel width

Understand frequency band, channel and width as separate settings in a supported wireless connection.

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XMLTV channel identifiers — illustrated reference table

XMLTV channel identifiers

Understand why a stable schedule identifier is different from a display name, channel number or logo.

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XMLTV programme data — illustrated reference table

XMLTV programme data

Understand the separate channel definitions, programme records and time metadata in an XMLTV guide.

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XMLTV timestamps and timezones — illustrated reference table

XMLTV timestamps and timezones

Understand explicit UTC offsets and separate source timestamps from a player’s local display time.

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