In this article
After reading, you'll understand:
- What transcoding is and how it differs from encoding
- Why streaming needs a rendition ladder
- The transcoding pipeline, step by step
- How Kinescope transcodes every upload automatically
What is transcoding?
Transcoding is the process of re-encoding an already-encoded video into different versions — changing the codec, resolution, or bitrate. In streaming, it means taking one source upload and producing several renditions of it, so a player can switch between quality levels as network conditions change.
It's easy to confuse with encoding. Encoding compresses raw video into a format for the first time; transcoding takes that compressed file and re-encodes it into new variants. When you upload a finished MP4 to a video platform, what happens next is transcoding.
Without transcoding, you could only deliver a single fixed quality — which buffers on slow connections and looks soft on fast ones. It is the step that makes adaptive bitrate streaming possible.
How transcoding works
A streaming transcode turns one file into a ready-to-stream package in four stages:
The uploaded file is decoded back to raw frames so it can be re-encoded cleanly. Working from the original source (rather than an already-compressed rendition) keeps quality high.
Each rung is re-encoded at a target resolution and bitrate — for example 1080p, 720p, 480p and 360p. A 4K source adds a 2160p rung; the ladder is tuned to the source so nothing is upscaled.
The packaged renditions are pushed to a CDN so viewers stream from an edge server near them. Parallel transcoding means playback can start on the first ready rendition while higher ones finish.
How Kinescope handles this
Transcoding runs automatically on Kinescope. Upload MP4, MOV, MKV, WebM and most common formats up to 4K, and the platform decodes the source, builds the full rendition ladder, packages HLS (and DASH for DRM), and serves everything through its own global CDN. Because renditions transcode in parallel, most uploads are embed-ready within minutes — no pre-processing and no encoding settings to manage.
Read the Kinescope docsEncoding vs. transcoding
| Aspect | Encoding | Transcoding |
|---|---|---|
| Input | Raw / uncompressed video | Already-encoded file |
| Purpose | Compress for the first time | Re-encode into new variants |
| Output | One compressed file | Multiple renditions / formats |
| Where it happens in streaming | Camera, editor, export | On the platform, after upload |
Frequently asked questions
What is the difference between transcoding and encoding?
Encoding turns raw or uncompressed video into a compressed format for the first time. Transcoding takes an already-encoded file and re-encodes it — into a different codec, resolution, or bitrate. In streaming, "transcoding" usually means producing the multiple renditions an adaptive stream needs from a single source upload.
Why is transcoding necessary for streaming?
Adaptive streaming needs several versions of the same video at different resolutions and bitrates so the player can switch quality to match each viewer's connection. Transcoding produces that rendition ladder. Without it you could only serve one fixed quality, which buffers on slow connections and looks soft on fast ones.
What is a transcoding ladder?
A transcoding (or "bitrate") ladder is the set of renditions generated from one source — for example 1080p, 720p, 480p and 360p, each at a target bitrate. The player picks a rung of the ladder based on real-time bandwidth. Platforms tune the ladder to the source resolution to avoid wasting storage.
Does transcoding reduce video quality?
Each re-encode is lossy, so a poorly configured transcode can lose quality. Done well — with modern codecs and sensible target bitrates — the loss is imperceptible, and the gain (smooth adaptive playback for every viewer) far outweighs it. Kinescope transcodes from your original source to keep quality high.
How long does transcoding take?
It depends on length, resolution and how many renditions are produced, but modern platforms transcode in parallel so playback can start before the whole job finishes. On Kinescope most files are embed-ready within minutes, with higher resolutions finishing in the background.
Do I need to transcode videos before uploading?
No. Kinescope transcodes on its side — upload MP4, MOV, MKV and most common formats up to 4K, and the platform builds the full adaptive ladder, writes the manifests and delivers via CDN. No pre-processing on your machine.
Further reading
- Transcoding — Wikipedia — a vendor-neutral overview.
- Apple — HTTP Live Streaming — packaging and delivery context for transcoded output.
