Stage reference

This chapter lists every stage, the presets that include it, and the chapter that describes it. Chapter 02 explains presets and how to add or remove a stage.

Protocols

Import from mattebox/protocols/<name>.

Stage	Does	In presets	Guide
`hls-cmaf`	Reads HLS playlists, plays on demand	`hls`, `dual`, `full`	03
`hls-live`	Reloads HLS playlists for live streams	`hls`, `dual`, `full`	04
`dash-cmaf`	Reads DASH manifests, plays on demand	`dash`, `dual`, `full`	03
`dash-live`	Reloads DASH manifests for live	`dash`, `dual`, `full`	04

Containers

Import from mattebox/containers/<name>.

Stage	Does	In presets	Guide
`ts-transmux`	Rewraps MPEG-TS as fragmented MP4	`*-ts`, `full`	08
`packed-audio`	Wraps raw AAC frames as fragmented MP4	`*-ts`, `full`	08

Stages in every preset

Import from mattebox/stages/<name>. Every preset except kernel includes these.

Stage	Does	Guide
`abr`	Picks the rendition from throughput and buffer	05
`abr-cap-size`	Caps the height to the element’s rendered size	05
`codec-switch`	Changes a buffer’s codec when the rendition’s codec changes	05
`recovery`	Retries, skips, and reloads after an error	09
`content-steering`	Switches CDN when the manifest names a steering server	11
`alt-audio`	Plays an audio rendition apart from the video	06
`text-webvtt`	Parses WebVTT subtitles	06
`text-webvtt-segmented`	Aligns segmented WebVTT with the media clock	06
`forced-subtitles`	Shows forced subtitles for the audio language	06
`text-cea608`	Decodes CEA-608 captions	06
`nal-scan`	Finds caption data in fragmented MP4 video	06
`cmaf-timing`	Places each segment at its playlist time	04
`pdt`	Maps media time to wall-clock time	04
`codec-probe`	Reads the codecs from an init segment	08
`mp4-box`	Reads MP4 boxes, for `codec-probe` and DASH indexes	08
`aes-128`	Decrypts AES-128 segments. HLS presets only	08

Stages in the `-ts` presets

Stage	Does	Guide
`meta-id3`	Reads ID3 metadata from a transport stream	08

Stages in the `-drm` presets

Stage	Does	Guide
`eme-core`	Opens key sessions and requests licenses	07
`eme-cenc`	Widevine, PlayReady, and ClearKey	07
`eme-fairplay`	FairPlay	07

Stages only in `full`

Stage	Does	Guide
`thumbnails`	Answers scrub preview images	10
`chapters`	Answers the chapters of a presentation	15
`trick-play`	Fast forward and rewind on the I-frame track	16
`timed-metadata`	Lists date ranges, events, ID3, and emsg	06
`text-cea708`	Decodes CEA-708 captions	06
`text-ttml`	Parses TTML subtitles	06
`hdr`	Keeps HDR off a screen that cannot show it	05
`qoe`	Measures startup, rebuffering, and switches	12
`cmsd`	Reads the CDN’s throughput and bitrate hints	11
`rendition-names`	Answers localized track names	06

Stages in no preset

Stage	Does	Guide
`cmcd`	Sends playback data to the CDN on each request	11