Live streaming terms describe different stages of getting video from a source to a viewer. Ingest sends a source to a platform; encoding prepares its media; transcoding can create alternate outputs; and formats such as HLS or DASH can deliver playback. A CDN helps distribute that media, while bitrate, adaptive quality, and latency affect what viewers experience. These terms are related, but they are not interchangeable—and platforms do not all use the same workflow.
How a live stream travels from source to viewer
A common workflow begins with a camera, computer, or other media source. An encoder prepares the audio and video and sends the resulting signal to a streaming service. The service may convert it into other formats or quality levels, package it for playback, and distribute it through a content delivery network (CDN). A viewer’s player requests the media and may change quality as network conditions shift.
That is a useful mental model, not a universal architecture. Google Cloud documents one example that accepts SRT or RTMP input and produces HLS or DASH output; ITU-T describes a workflow involving encoding and upload, platform transcoding and multiplexing, and CDN delivery. A particular provider may use different components or support different settings. See Google Cloud’s Live Stream API overview and ITU-T Recommendation H.705.2.
Source and ingest: getting media into a service
Source
The source is the origin of the audio and video being streamed. It could be a camera feed, a computer’s output, or other media. The source is not the same thing as the platform that receives or delivers it.
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Ingest
Ingest is the process of sending a live source signal to a streaming platform or service for processing. In an encoder’s settings, the ingest address and stream key identify where the signal goes and which stream it belongs to; the exact setup depends on the destination service.
RTMP and SRT
RTMP and SRT are protocol names you may see as ways to send a source stream to a service. In Google Cloud’s documented workflow, they are input examples. They are not the same category as HLS or DASH, which can be used for viewer delivery. Which ingest protocols are supported depends on the platform.
Processing: preparing and converting the stream
Encoding
Encoding prepares audio or video data for transmission using a selected codec and configuration. An encoder can run on a computer or be part of a service. The settings determine how the source is represented for the next stage of the workflow.
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Codec
A codec is the method used to compress and decompress audio or video. It is distinct from a container, a transport protocol, and a playback format. A service’s documentation may list supported codecs separately from supported protocols; check the destination’s requirements rather than assuming every combination will work. Google Cloud’s overview distinguishes these categories in its supported inputs and outputs.
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Transcoding
Transcoding converts an incoming encoded signal into other output forms, such as versions at different quality levels. A platform may do this after ingest so viewers have options suited to their devices or connections. It is different from encoding the original source: encoding prepares media, while transcoding transforms an existing encoded signal. Google Cloud describes platform-side processing in its workflow overview; Cloudflare also describes transcoding live video into multiple quality levels in its live video documentation.
Packaging and delivery: HLS, DASH, segments, and CDNs
Packaging, segments, and manifests
Packaging organizes media for delivery in a playback format. In HLS and DASH workflows, media is commonly delivered in segments, and a manifest or related description tells the player what media is available and how to request it. The exact implementation varies by service and format; these terms do not imply that every platform packages streams in precisely the same way.
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HLS
HLS means HTTP Live Streaming, Apple’s live and on-demand streaming technology. It uses ordinary web servers and CDNs and can adapt playback to network conditions. HLS is a delivery and playback technology, not an ingest protocol. Apple describes its design and use in its HLS documentation.
DASH
DASH means Dynamic Adaptive Streaming over HTTP. It is a suite of standards for streaming multimedia over HTTP infrastructure and supports live as well as on-demand use. Like HLS, DASH belongs to the delivery side of a workflow, but the two are distinct technologies and standards; a provider’s support for one does not establish support for the other. See MPEG’s DASH overview.
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A content delivery network (CDN) is distributed infrastructure that helps serve stream media to viewers. It can place delivery capacity closer to audiences and handle requests through servers, proxies, or caches. A CDN distributes media; it is not the camera, encoder, or ingest protocol. MPEG describes DASH’s use with existing HTTP servers, CDNs, proxies, and caches in its DASH overview.
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Playback quality: bitrate, renditions, and ABR
Bitrate
Bitrate is the rate at which encoded data is produced, delivered, or consumed, commonly expressed in bits per second. It affects how much data a stream uses and is one factor in picture and sound quality. There is no single bitrate that is right for every stream: YouTube’s recommended encoder settings vary by codec, resolution, and frame rate. Consult YouTube’s current encoder settings guidance for a YouTube stream, and follow the destination platform’s own guidance elsewhere.
Rendition and bitrate ladder
A rendition is one version of a stream prepared at a particular quality level. A set of renditions is often called a bitrate ladder. A platform may transcode one incoming stream into several renditions so a player can choose among them based on available bandwidth and device conditions.
ABR
Adaptive bitrate streaming (ABR) lets a player switch among available renditions as network conditions change. HLS supports adapting playback to network conditions, and Cloudflare describes live transcoding into multiple quality levels for ABR playback. ABR gives the player choices; it does not guarantee uninterrupted playback or a fixed picture quality. See Apple’s HLS documentation and Cloudflare’s live video documentation.
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Buffering
Buffering is a pause or delay in playback associated with the player not having media ready to play. Changes in network conditions may affect playback, and adaptive streaming may respond by selecting another rendition, but neither term promises that buffering will never occur. The cause of a pause can depend on the connection, player, and delivery setup.
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Latency
Latency is the delay between an event happening and its presentation to a viewer. The acceptable delay depends on the use case: an interactive conversation generally values prompt delivery more than a stream people watch without participating. There is no universal threshold that makes a stream “low latency”; the service, configuration, and application all matter. ITU-T contrasts non-interactive and interactive scenarios in Recommendation H.705.2, while IETF RFC 9317 notes that latency requirements vary by application.
VOD
Video on demand (VOD) is previously recorded content made available for playback, rather than media created and streamed while an event is in progress. A live platform may also offer recordings for later viewing, but that does not make the original event on demand. RFC 9317 distinguishes live media from media on demand: read the RFC.
Common term mix-ups, clarified
| Terms | How they differ |
|---|---|
| Ingest vs. playback delivery | Ingest sends a source signal to a service; HLS or DASH may deliver media from a service to viewers. |
| Encoding vs. transcoding | Encoding prepares media in a codec and configuration; transcoding converts an already encoded signal into other outputs or quality levels. |
| Codec vs. protocol | A codec compresses or decompresses audio or video. A protocol governs how data is sent between systems. They are different parts of a stream setup. |
| HLS vs. DASH | Both are HTTP-based streaming technologies used for playback, but they are distinct standards and implementations—not synonyms, and not substitutes for an ingest protocol. |
| Bitrate vs. quality | Bitrate is a data rate, not a guaranteed picture-quality setting. The result also depends on the codec, resolution, frame rate, source, and delivery conditions. |
| Latency vs. buffering | Latency describes end-to-end delay. Buffering is a playback pause or delay when media is not ready. They can affect the viewing experience differently. |
What to check when choosing stream settings
- Confirm the role of each setting. Identify whether a field is for source ingest, encoding, or viewer playback before changing it.
- Check platform compatibility. Verify supported ingest protocols, codecs, output formats, and latency modes in the chosen service’s current documentation.
- Use platform-specific bitrate guidance. Recommendations can change with codec, resolution, and frame rate; do not treat one number as universally correct.
- Match latency to the audience. A live Q&A has different interaction needs from a stream intended mainly for passive viewing.
- Allow for changing conditions. ABR can move among available renditions, but it cannot guarantee a particular quality or eliminate interruptions.
For YouTube encoder configuration, start with its encoder settings guidance. For other destinations, use that platform’s current instructions. Provider support and settings can change.
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