v0.3.1

Highlights

• dashcheck runs on Windows: a local MPD keeps its drive letter, and CI builds and tests on Windows
  as well as Linux and macOS.
• The browser tool's examples are grouped as live, on demand and with errors. The errors now come
  from real test vectors: avc1 in @codecs for an avc3 sample entry (CTA WAVE), and on demand
  without @subsegmentAlignment (DASH-IF). The examples that gave misleading results are replaced.
• A check without errors shows its 0 errors in green.
• The clock line names the UTCTiming scheme of its time source, and CLOCK-LOCAL no longer adds an
  info to every live check when the local clock is only a few milliseconds off.

Changed

• The browser tool's examples are grouped as live, on demand and with errors, with new examples from
  livesim2 (low latency) and the DASH-IF and CTA WAVE test vectors.
• The browser tool shows 0 errors in green, in the result and in the history.
• CLOCK-LOCAL (info) only when the local clock is more than 500ms off the reference clock. The clock
  line of the report still gives the offset.

Fixed

• dashcheck keeps the drive letter of a local MPD on Windows, which it lost when the MPD was not on the
  current drive. Local paths with #, % or ? work on all platforms.
• The clock line of the report and CLOCK-SKEW give the UTCTiming scheme of the time source (http-iso,
  direct, ...), or say that it is the reference clock. A direct source was named by its time.

v0.3.0

Highlights

• dashcheck has been run on all CTA WAVE and DASH-IF test vectors, and the false positives this
  found are fixed: self-initializing files, servers that answer byte ranges with 200, negative
  S@r, Periods after remote Periods, HE-AAC sampling rates, DTS audio and side-loaded subtitles.
• tfdt and trun boxes are required only where the specifications require them. Fragments
  without tfdt are now checked instead of skipped.
• Results follow the spec wording more closely, so an MPD that passed 0.2.1 can fail 0.3.0:
  MPD-MAXSEGDUR is now an error and checks whole Segment Sequences, while MPD-COMMON-BOTH is
  now information.
• The browser tool keeps the latest 20 checks with their results, and its progress bar now
  covers the MPD update checks.

Added

• HTTP-RANGE (warning), and HTTP-IOP-RANGE (error) for the IOP on-demand profile, when a server
  answers a byte range request with status 200. dashcheck then cuts the ranges from the whole resource.
• The browser tool keeps the latest 20 checks with their results in localStorage, to show them
  again or to check a URL again with the same options.
• MPD-XLINK-START (warning) instead of an ADDR-PERIOD error for a Period without @start after a
  remote Period without @duration. Its segments are checked if its duration is known.
• INIT-UNSUPPORTED (info) for sample entries that dashcheck cannot decode, such as DTS (dtsc,
  dtse), instead of SEG-CMAF-INIT errors.

Changed

• MPD-COMMON-BOTH is information instead of a warning: ISO/IEC 23009-1 5.3.7.1 allows it.
• MPD-MAXSEGDUR is an error instead of a warning (5.3.9.6.2), and compares a whole Segment Sequence
  (@d with @k) with @maxSegmentDuration.
• References to ISO/IEC 23009-1 follow the published 6th edition (2026); SEG-SIDX-SPAN cites 6.3.5.4.

Fixed

• LIVE-NO-SEGMENTS no longer reports a live Period whose first segment is not complete yet, or
  whose last segment leaves the time-shift buffer within the live margin.
• The browser tool's progress bar covers the MPD update checks; it fell back to 5% while they ran.
• XCHK-SAMPLERATE accepts the sampling rate after SBR for HE-AAC (mp4a.40.5, mp4a.40.29).
• SEG-DURATION lets the last segment of an S with a negative @r end at the Period end.
• For a self-initializing file (SegmentBase without Initialization), only the bytes before
  @indexRange are fetched as its Initialization Segment, not the whole file.
• A missing tfdt is a SEG-TFDT error only in CMAF, msdh segments and the first fragment with
  SegmentTimeline and $Time$ but no sidx. SEG-START-UNKNOWN (info) marks other segments starting without it.
• A traf without trun is a SEG-CMAF-CHUNK error in CMAF tracks only, not a SEG-STRUCTURE error.
• MPD-CODECS no longer warns about side-loaded subtitle files (application/ttml+xml, text/vtt).

v0.2.1

Highlights

• Every livesim2 feature has been checked, and the false positives this found are fixed. Valid
  streams no longer get errors or warnings for utc:direct timing, thumbnails, audio priming in
  edit lists, multi-Period live, low-latency subtitles, Content Steering, or
  @availabilityTimeOffset without low latency.
• Remote (XLink) Periods and Annex I URL parameters, which dashcheck does not support, are now
  reported as info instead of failing with MPD-SEGINFO-NONE or HTTP-INIT errors.

Added

• MPD-XLINK-UNRESOLVED (info) for remote Periods, which dashcheck does not resolve. They are
  no longer MPD-SEGINFO-NONE errors.
• ADDR-UNSUPPORTED (info) for Representations that need Annex I URL parameters
  (urn:mpeg:dash:urlparam:2014 or 2016). Their segments are no longer fetched.

Fixed

• MPD-UPDATE-PUBLISHTIME ignores the time in a urn:mpeg:dash:utc:direct:2014 UTCTiming,
  which changes with each response.
• CLOCK-SKEW allows for whole seconds from utc:direct, http-iso and http-xsdate time sources.
• MPD-CODECS no longer warns about images such as thumbnail tiles, which have no codecs parameter.
• SEG-EPT and SEG-DURATION leave out media that the edit list cuts, such as audio priming. With an
  edit list, an S@t equal to the tfdt is SEG-EPT, not SEG-EPT-CTO.
• LIVE-STALE measures a Period that has ended at its end. Earlier Periods of a multi-Period live
  MPD are no longer reported as stale.
• MPD-LL-MIMETYPE accepts application/mp4 for text, the media type of CMAF text tracks.
• MPD-XSD accepts a space-separated list in ContentSteering@defaultServiceLocation, as
  ISO/IEC 23009-1 and ETSI TS 103 998 define it.
• @availabilityTimeOffset alone no longer turns on the low-latency rules. Without the
  low-latency profile, @availabilityTimeComplete false does.

v0.2.0

Added

• SEG-CONTINUITY-FRAGMENT: each chunk or fragment in a segment must start at the previous one's
  tfdt plus its sample durations (ISO/IEC 23000-19 7.3.2.2, 7.3.2.3).
• CMAF brand rules: SEG-CMAF-MINORVERSION, and for the cmf2 brand SEG-CMF2-ELST, SEG-CMF2-TRUN
  and SEG-CMF2-DEFAULTS (each chunk sets sample durations, sizes and flags, not only trex).
• -sequence-numbers, also in the browser tool's options: checks the convention of one mfhd
  sequence_number per segment, shared by its chunks and increasing (SEG-SEQUENCE-NUMBER).
• MPD-DVB-SCTE-BINARY: an SCTE-35 event must carry a base64 splice_info_section in its
  Signal/Binary element.
• SEG-CMAF-CHUNK (one traf with one trun per moof) and SEG-CMAF-SAP (video CMAF fragments start
  with a sync sample). The CMAF rules now also apply to low-latency chunked Representations.
• XCHK-CMAF-SIZE: in the DASH profile for CMAF content, @maxWidth and @maxHeight (or @width
  and @height) must be the tkhd size of the largest track.
• SEG-SIDX-SPAN: the sidx box of a SegmentBase Representation must index every movie fragment of
  its file.
• Segment Sequence MPD rules: MPD-SSR-SIGNAL (a profile that allows them or the
  urn:mpeg:dash:ssr:2023 EssentialProperty), MPD-SSR-TIMELINE, MPD-SSR-ATTRIBUTES and
  MPD-SSR-PROPERTIES.
• SEG-SSR-SAP: the Partial Segments that SegmentSequenceProperties@cadence selects must start with
  a sync sample when @sapType is 1 or 2.
• SEG-CMAF-SINF: every sample entry of an encrypted CMAF track must be protected (no clear sample
  entry for a clear lead), with tenc default_isProtected 1.
• ContentProtection rules: XCHK-CP-MISSING, XCHK-CP-SCHEME and XCHK-CP-KID against the init segment,
  MPD-CP-CENC, MPD-CP-ROBUSTNESS, MPD-CP-REF, MPD-CP-CLEARKEY and MPD-CP-DEFAULTKID, and per profile
  SEG-AS-KID, SEG-IOP-PSSH, SEG-IOP-PSSH-INIT, MPD-IOP-CP-DRM and MPD-DVB-CP-DRM.
• docs/rules.md documents all rules with the DASH-IF checks each covers, and marks the rules that
  the DASH-IF Conformance tool does not have.

Changed

• Segment Sequences (ISO/IEC 23009-1 5.3.9.7, @k and $SubNumber$) are now addressed and their
  Partial Segments checked, with @startWithSAP on the first of each sequence. Only SegmentTimeline
  duration patterns (S@p, S@ssp) remain ADDR-UNSUPPORTED.
• XCHK-CP-MISSING replaces SEG-LL-PROTECTION and checks all encrypted tracks, not only low latency.
• SEG-HLS-BITRATE (-hls-interop) also checks SegmentTemplate and SegmentList content when every
  segment is checked, and live streams whose checked segments cover an hour (at most 110%).

Fixed

• ContentProtection@ref is resolved, so MPD-CP-VALUE, MPD-IOP-CP and SEG-DVB-PSSH see the @value,
  cenc:default_KID and cenc:pssh that a descriptor inherits from its source.
• MPD-CP-VALUE accepts a version (cenc:1) and a percent-encoded 4CC in the mp4protection @value.
• SEG-CMAF-SENC no longer reports clear-lead fragments, or audio with constant IVs, which has no
  sample auxiliary information. A track's protection comes from its first protected sample entry.
• file: URLs: a byte range that ends after the file is cut at its end, as over HTTP.
• MPD-XSD checks the XLink attributes against xlink.xsd (such as the xlink:actuate values), and its
  messages give the invalid value and what was expected (jacoelho/xsd v0.6.7).

v0.1.2

Fixed

• The dot of LIVE TIMING in the logo no longer touches the text.

v0.1.1

Added

• The browser tool shows the dashcheck logo, has a favicon, and an image for link previews.

v0.1.0

The first release of dashcheck:

Added

• dashcheck command and browser tool (WebAssembly) that check an MPEG-DASH MPD, its segments
  and, for live streams, the segment availability against a synchronized clock.
• MPD checks: the 6th edition XML schema and semantic rules for DASH, DASH-IF IOP, CMAF,
  low latency, DVB-DASH, HbbTV, CTA WAVE and Dolby, selected by @profiles.
• -profiles, and "Check against" in the browser tool: choose the profiles to check (DASH-IF IOP,
  CMAF, low latency, DVB-DASH 2014/2017, HbbTV, CTA WAVE), with or without those in MPD@profiles.
• Segment checks with mp4ff, cross-checked against the MPD timeline and attributes.
• -updates: refetches a dynamic MPD and checks the update against the version before.
• -hls-interop: the DASH-HLS interoperability rules of CTA-5005.
• 380 of the 408 checks of the DASH-IF Conformance tool, and 6 in part; see docs/dashif-coverage.md.
• -short: a FAIL, WARN or OK line per MPD instead of the report, also for several MPDs such as
  dashcheck -short streams/*.mpd, checked -parallel at a time.
• -json: the report, or with -short an array of reports, with error, warning and info counts.
• -version, and the version in the footer of the browser tool.
• The browser tool, published on GitHub Pages for each release, counts visits and checks with
  GoatCounter, without cookies or MPD URLs.