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Version: v2

Changelog

[11.12.0] - 2026-09-30​

  • Fixed a channel waiting for its RTMP contribution leaving a connection open on the RTMP server at every retry when the server holds its reply to the engine's play request until a stream is published; every attempt now closes its connection when it ends
  • Fixed EXT-X-PROGRAM-DATE-TIME running behind the wall clock, for as long as the channel kept running, by however long the ingest took to deliver media after connecting, such as an RTMP source whose server accepts the connection before its publisher is live. Latency measured from the program date-time was overstated by the same amount; EXT-X-HESP-PROGRAM-DATE-TIME and the SCTE-35 EXT-X-DATERANGE dates are corrected alike
  • Fixed S3 DVR playlists opening with EXT-X-DISCONTINUITY when a channel restarted after being stopped for longer than its DVR window, which kept Safari from starting playback, or left it playing audio only, until the window had filled again; hourly VOD playlists that begin with a restart are fixed alike. DVR playlists now also increment EXT-X-DISCONTINUITY-SEQUENCE as each discontinuity leaves the window
  • Made the S3 DVR and VOD output cacheable like the engine's own HLS output: media playlists for half a target duration (at least a second), multivariant playlists for two seconds in browsers and one on CDNs like main.m3u8, and init segments for an hour; playlists no longer forbid caches from serving them stale (must-revalidate). An ended hourly VOD playlist was cacheable until it expired, keeping players on a stale copy when the channel restarted within the same hour
  • Fixed segments kept from before a restart in the S3 DVR window or hourly VOD playlist being paired with the new init segment after an encoder configuration change: every channel start now uploads its own init-<id>.mp4 instead of overwriting init.mp4
  • Fixed a channel restarted within the same hour adding segments to an hourly VOD playlist on S3 that kept its EXT-X-ENDLIST, so players took it as complete; the playlist is reopened until the hour or the channel ends
  • Fixed S3 DVR playlists ignoring the channel's DVR window and always keeping the last four hours: they now keep the configured window, one hour unless set otherwise, as the discovery response already reported

[11.11.2] - 2026-09-25​

  • Fixed an RTMP ingest that accepts the connection but sends no data crash-looping the engine and putting the channel in error: the channel now waits for the contribution, goes live as soon as it arrives, and is stopped by its ingest idle timeout like channels with other ingest types

[11.11.1] - 2026-09-24​

  • Allowed browsers to reuse multivariant playlists (main.m3u8, main.hesp.m3u8) and HESP manifests (manifest.json) for up to two seconds while CDNs keep caching them for one (Cache-Control: max-age=2, s-maxage=1), so a repeated request for the same manifest no longer goes back to the CDN when the CDN reports its copy as a second old

[11.11.0] - 2026-09-23​

  • Added RFC 9218 priority hints to every HLS response (priority: u=1 on playlists, u=2 to u=6 on media in ascending order of the rendition's bit rate), so Apple devices keep Low-Latency HLS playback over HTTP/3 instead of falling back to standard latency. HESP-3 objects streamed while in production are marked incremental (i), thumbnails are served at the lowest urgency (u=7) so they never delay media, and error responses at the highest (u=1) so a player learns of a missing object without waiting behind a segment
  • Fixed the HLS (TS) multivariant playlist omitting the CODECS attribute; every variant now declares its H.264 profile and level and the AAC audio codec
  • Every error response now says how long a CDN may keep it: a 404 for a playlist or segment, which the next segment or the next restart may bring into existence, lasts one second, so a CDN no longer keeps serving one it picked up while the channel was restarting. Segments that have left the DVR window are answered with 410 Gone, and paths the engine never serves or requests that can never succeed stay 404 or 400, all cacheable for an hour; internal errors are not cacheable
  • Media playlists are now cacheable for half a target duration (at least a second), and the responses to blocking playlist reloads (_HLS_msn) for three target durations; segments for an hour rather than a day. Playlists no longer forbid a cache from serving them stale (must-revalidate)

[11.10.0] - 2026-09-18​

  • Added Low-Latency HLS and HESP-3 output to every channel, no configuration needed: main.m3u8 keeps serving standard HLS, while main.hesp.m3u8 serves the same renditions with partial segments and the HESP-3 tags. Every playlist accepts a latency query parameter (milliseconds) naming the end-to-end latency the player asks for and is sized for it: HOLD-BACK (now declared on every playlist) and PART-HOLD-BACK follow the buffer that latency leaves the player once the encoder's share is spent, the HESP-3 multivariant playlist publishes that buffer as EXT-X-HESP-TARGET-BUFFER (at least 0.5 s), and a buffer of more than four segment durations is served as standard HLS. Every media playlist of a channel carries the same EXT-X-SERVER-CONTROL, as the HLS specification requires
  • HESP-3 media playlists signal how far the stream has progressed into the segment in production (EXT-X-HESP-PROGRAM-DATE-TIME), and every media playlist response carries the engine's clock at generation (x-hesp-origin-now), so a joining player lands at a predictable distance from live even when the playlist was served from a cache
  • Added SCTE-35 ad break signaling to HLS, enabled by the new optional hls.scte35 config key (off by default): splice_insert cues in an MPEG-TS ingest are exposed in every media playlist as EXT-X-DATERANGE tags carrying the SCTE35-OUT / SCTE35-IN payloads, and segments are cut at the splice points so an ad decision server can splice on segment boundaries. When off, the SCTE-35 PID of the ingest is ignored
  • Added SCTE-35 time_signal cues from an MPEG-TS ingest to the EXT-X-DATERANGE tags of every HLS media playlist, alongside the splice_insert cues. Advertisement, placement opportunity and promo segmentation descriptors open a range with SCTE35-OUT and PLANNED-DURATION and close it with SCTE35-IN, END-DATE and DURATION, paired by their segmentation event id; other segmentation descriptors and time signals without any mark their time with SCTE35-CMD. A segment boundary is cut at every time signal that carries an avail_descriptor, DTMF_descriptor or segmentation_descriptor
  • EXT-X-DATERANGE START-DATE and END-DATE attributes are now written in the same form as EXT-X-PROGRAM-DATE-TIME: UTC with a Z suffix and millisecond precision, instead of +00:00 with a varying number of fraction digits
  • Kept HLS playlists and published media available for 10 seconds after graceful shutdown, with EXT-X-ENDLIST signaling the end of the stream
  • Fixed engine crashes when an MPEG-TS ingest carries an SCTE-35 section that fails validation; such sections are now skipped with a warning without interrupting playback
  • Fixed SCTE-35 cues padded with alignment stuffing before their checksum being rejected instead of forwarded to the HLS playlists
  • Fixed HESP playback failing to start when the player requested an initialization segment slightly ahead of the live edge
  • Fixed SRT ingest in listener mode (?mode=listener) binding a random port instead of the configured one, which left the channel restarting on "no live data" forever; localport in the ingest URL also no longer crashes the engine
  • Fixed renditions whose aspect ratio differs from the source (such as a portrait 9:16 ladder fed by a 16:9 ingest) being encoded with non-square pixels, which Chrome rendered squeezed while Safari rendered it correctly. Such renditions now keep square pixels and are padded with black bars to fit, so they render identically in every browser

[11.9.0] - 2026-09-03​

  • Sorted media playlists in HLS multivariant playlists by descending preference score
  • Fixed brief gaps between contiguous DVB-TTML subtitles when cue durations differ from packet timing
  • Fixed HLS multivariant playlists not declaring CLOSED-CAPTIONS=NONE on variants when no closed captions are configured, as the specification requires
  • Removed the EXT-X-INDEPENDENT-SEGMENTS tag from HLS media playlists; it stays declared once in the multivariant playlist, matching Apple's validation guidance
  • Improved the quality of GPU-encoded H.264 renditions at 720p and above, which were encoded with the H.264 Main profile while CPU-encoded renditions of the same rung used High. All renditions at 720p and above now use High at the same bitrate, a small quality gain at a 1080p 6.5 Mbps rung and a larger one at lower bitrates. Renditions below 720p stay on Main for decoder compatibility, and the CODECS attribute in HLS manifests changes accordingly for the affected renditions
  • Fixed H.265 and H.264 ingests the GPU decoder cannot handle (such as 4:2:2 chroma subsampling) leaving the channel stuck in a reconnect loop; those streams now fall back to software decoding

[11.8.1] - 2026-08-06​

  • Fixed RTMP ingest failing with "stream not found" against servers that only offer the stream as live

[11.8.0] - 2026-07-29​

  • Added Dolby Atmos encoding
  • Added Dolby Vision Profile 8.1 output
  • Fixed language tags in HLS manifests not following the standard (e.g. en should be used instead of eng)
  • Fixed HLS SDR variants missing the video range declaration that players require when HDR variants are also offered
  • Changed an ingest that connects but sends no data to be treated the same as an ingest that does not connect: the channel stays in the waiting state instead of showing an error, and stops after the ingest timeout

[11.7.2] - 2026-07-22​

  • Fixed MPEG-TS ingests failing when the initial PMT does not announce all tracks yet (e.g. audio only), which are completed by a later PMT update

[11.7.1] - 2026-07-13​

  • Fixed the S3 DVR and VOD root manifests being written without video codecs in CODECS at stream start

[11.7.0] - 2026-07-13​

  • Added an HLS SCORE attribute so players prefer H.265 renditions over H.264 when they can decode them
  • Added support for DVB-TTML on ingests to generate captions for distribution
  • Added the ability to auto-generate captions and translations
  • Fixed HLS variants referencing a CLOSED-CAPTIONS group when no captions are configured
  • Fixed various HLS DVR issues with channels stopping and starting with ABR ladder changes in between
  • Fixed an issue where the stream would be stuck on large DTS jumps in the ingest

[11.5.2] - 2026-07-01​

  • Fixed ingest failing for high-bit-depth or 4:2:2 sources (e.g. H.264 High 4:2:2 10-bit)

[11.5.1] - 2026-06-17​

  • Enabled the PlayReady key system by default

[11.5.0] - 2026-06-16​

  • Added BT.709 SDR to HDR10 conversion following the Dolby + MovieLabs best practices
  • Carried custom in-stream metadata as ID3
  • Exposed the active codec in the CMSD header
  • Added CODECS attribute to the HLS multivariant playlist
  • Added support for H.265 HLS
  • Added support for NVIDIA (NVENC) hardware encoding / decoding
  • Fixed duplicate per-frame closed-caption SEI when encoding below the source frame rate
  • Fixed SCTE-35 segmentation descriptor parsing failing when optional sub-segment fields are absent
  • Fixed Nielsen ID3 emsg event duration
  • Stopped the engine going into Error state when the ingest is not available yet

[11.4.0] - 2026-06-08​

  • Added support for single ingest
  • Fixed metric updates lagging behind and being dropped
  • Fixed the bitrate metric being reported too high
  • Fixed metrics stopping permanently after an interruption

[11.3.0] - 2026-05-19 (unavailable)​

  • Added targetBuffer to HESP manifest
  • Added holdBack to HLS media playlists
  • Added support for packaging multiple frames per chunk in HESP
  • Added support for SEI metadata to EMSG metadata conversion
  • Added support for single ingest
  • Added margin to bandwidth in HESP manifest

[11.1.0] - 2026-04-20​

  • Added support for PlayReady
  • Added support for DRM with both CENC and CBCS encryption

[11.0.0] - 2026-04-07​

  • Fixed MPEG-TS HLS not returning 404 when sub playlists do not exist yet

[10.13.0] - 2026-03-31​

  • Added image overlay support
  • Fixed MPEG-TS HLS not returning 404 when sub playlists do not exist yet

[10.12.1] - 2026-03-26​

  • Made protection optional in the HESP manifest instead of returning an empty one when no DRM is configured

[10.12.0] - 2026-03-06​

  • Allowed enabling / disabling of individual protocols
  • Optimized encode of HLS when HESP is disabled
  • Improved quality of de-interlacing
  • Improved quality of video scaler
  • Disabled PlayReady

[10.9.0] - 2026-01-30​

  • Initial changelog