Delete re-implementations in the demux:// sink and wire to proven helpers;
keep only genuinely-new functionality.
- AnnexB reframing: delete the sink's local length_prefixed_to_annexb (it
break'd on a zero-length NAL, dropping the rest of the access unit) and
call the canonical append_length_prefixed_as_annex_b in mux::hevc, which
skips just the empty NAL.
- HEVC param sets: delete hvcc_param_sets; reuse hvcc_to_annex_b.
- avcC param sets: hoist as the new canonical avcc_to_annex_b in mux::hevc,
next to hvcc_to_annex_b (the symmetry point); the sink calls it.
- PGS .sup: emit a synthetic clear display set (empty PCS + END) at
pts + duration_ns so subtitles time out instead of lingering to EOF.
- TimelineContinuity: move verbatim into the shared mux::timeline module
(with the prev_offset straggler-remap intact) and use it from both the
MKV muxer and the demux sink; delete the sink's drifted TimelineRebase
copy (which lacked the straggler branch).
- VobSub .idx: emit the conventional 'id: <lang2>, index: 0' line mkvmerge
reads to assign the subtitle language; palette reuse unchanged.
- output(): seed DemuxOptions.base from title.playlist when non-empty.
New constants for the PGS clear-segment framing and avcC header cite the
public HDMV PGS (BD-ROM Part 3) and ISO/IEC 14496-15 specs.
Tests: a zero-length NAL mid-frame no longer truncates the AU; a frame with
duration_ns produces a .sup clear segment; existing demux tests stay green.
New write-only pes::Stream sink that taps the per-track PesFrame stream
(the seam right before MKV muxing) and writes each track to its own
elementary-stream file, plus chapters and per-audio-track delay metadata.
Purely additive — the MKV mux path is untouched.
- mux/demux_sink.rs: DemuxSink + EsWriter dispatch. Pass-through for
codecs whose Frame.data is already standalone ES (MPEG-2, VC-1, AC3/
E-AC3, DTS/DTS-HD, TrueHD, LPCM). Non-trivial writers:
- AnnexBWriter: reframes hvcC/avcC 4-byte-length-prefixed NALs to
Annex-B and prepends VPS/SPS/PPS parsed out of the codec_private
configuration record (HEVC .hevc / H.264 .h264).
- PgsSupWriter: rebuilds the HDMV 'PG' segment framing the parser
strips, with 90kHz PTS/DTS (.sup).
- VobSubWriter: writes raw SPUs to .sub and synthesizes the .idx
sidecar (palette + per-SPU timestamp/filepos).
- Delay-in-filename (mkvmerge-readable 'DELAY <n>ms') + chapter XML/OGM
export. TimelineRebase ports the MKV muxer's seamless-branch epoch
logic so per-track ES timestamps stay continuous across clip joins.
- mux/resolve.rs: StreamUrl::Demux variant + scheme/path_str/parse_url/
input(write-only)/output arms.
- mux/mod.rs: module + public type re-exports.
16 unit tests: Annex-B reframing, hvcC/avcC param extraction, delay
sign/rounding + mkvmerge-regex match, PGS .sup framing, VobSub .idx
synthesis, chapter XML/OGM, timeline rebase, and end-to-end file-keying
by track + track selection.
Matthew Jackson