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transport/webrtc/channel.py, limits.py and media_tools.py, cut from
webrtc_server.py as text; the facade imports them back.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The security claims table, §3.4's property 2, the protocol's stated
limits, the quickstart and the user guide's defaults now say where a
link's code differs: bound to its account only when redeemed, and held
by the hub when the inviter asks it to mail.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The plan was a working document; what it decided lives in
MESHBAY_DESIGN.md and MESHBAY_NODE_PROTOCOL.md. Code and tests now
cite those instead.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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New invite kind "link": member of one group, once, never operator, not
spendable by an active member, capped at 20 per group, cancellable by
handle. Signed ops invite_link_create / invite_cancel, loopback routes,
and the known-device join path now accepts a link code. Adds the plan,
docs/invite-links.md.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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node_pk in handshake_challenge is now signed over the channel binding
and both nonces, so a client can check the node key before a join
rather than only at the ack. Both transports; the browser and the QUIC
client refuse a wrong signature and treat an absent one as an older node.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Was a 4 GB constant in webrtc_server.py, the same on a small board and on
a machine holding a library. Now max_upload_gb in node.toml, on the Node
page and via `meshbay-node transfers max-size`, read from the transport
context per chunk so a change reaches an upload already running.
MESHBAY_DESIGN.md §6.4; §15.3 records a defect found beside it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The two documents disagreed with the code they describe. §15.2 still listed
playlists and Chromecast subtitles as not built, both shipped and tested; the
protocol document's header said wire version 3.2 beside its own §13 saying 3.3,
which is §12's "a number restated away from its definition is a number that will
drift" happening to the document that states the rule.
The packaged install is no longer an open question: the artefacts have been taken
to a running hub and node on Ubuntu 26.04 (.deb), Fedora 44 (.rpm) and Windows 11
(.exe). What is left of D11 is signing the binary, which is a different question
from whether it installs.
The migration row overstated its own risk. Nothing replays the revisions behind
the first packaged release — they were development no installation ever ran — so
the exposure is the next migration, not the chain.
The disk-I/O row gains the consequence that was measured rather than reasoned: a
root waking from standby stalls the loop long enough for a client's WebRTC
connection to time out, on one node with one member. `refresh_availability` is
named beside the two chunk paths, because a stat on a sleeping disk is what wakes
it while reading nothing.
A blank line had also split §15.3's table in two.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The previous fix read ffprobe's key frames and took the last one at or before
the request. It was wrong twice, and a viewer felt the difference: subtitles
went from 5 s early to 2–3 s late.
Matroska's Cues index only some keyframes, so an index seek backs off to an
indexed one that the frame list does not single out. And the landing point
moves with **which streams are mapped**, because the container is positioned
where every mapped stream has data — on the reported title, a seek to 4913.7 s
landed at 4909.863 with video alone and at 4907.236 with the second audio
track mapped beside it. The frame scan gave the first number; the stream
delivered the second; the gap was 2.65 s, and the measured audio displacement
in the served stream was 2.65 s.
So the node asks ffmpeg instead: the same seek, the same mapping, one copied
frame under `-copyts`, and the answer read back off the result. 0.06–0.07 s,
cheaper than the scan it replaces. The `-ss` argument stays at the request, so
the bytes served are exactly the ones served before — only the number naming
them changes. The probe runs after the audio track is resolved, because it
cannot be right before that is known.
An answer after the request, or further before it than any real keyframe gap,
is discarded in favour of the old label: a number wrong by seconds beats a
fabricated one.
Found by decoding the served stream and locating its first frame in the
source, which put it at 4907.213 s against an announced 4909.863 s. The test
does the same thing rather than comparing the announced number against a
second reading of the same probe.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UGY17EPph5LsLzePPXhUVc
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Copied video can only start on a keyframe, so `-ss t` with `-c:v copy`
delivers the keyframe at or before `t`. The node reported `t` anyway and the
client builds `SourceBuffer.timestampOffset` out of that number, so everything
downstream believed the picture stood a few seconds further along than it did.
That was a wrong label while only the scrubber read it — it is recorded as
such, low priority, in the design document. Subtitles made it a wrong answer:
their cues carry the source's own absolute timestamps, so the mismatch put
every line on screen before it was spoken. Reported from real use on an H264
title, where seeking to 600 s, 2650 s and 5000 s lands on keyframes 0.82 s,
1.56 s and 4.64 s earlier.
The copy path now resolves the request to that keyframe, seeks to it, and
reports it. The bytes delivered do not change — ffmpeg lands on the same frame
either way — only the number that names them. The look-up reads the thirty
seconds before the request and cost 0.12–0.51 s on that title, which is the
price already costed in §15.3 and never paid. Re-encoded video is untouched:
it can begin exactly where it is asked to, and does.
Two details worth their lines. The keyframe is passed back to ffmpeg at six
decimals, because rounding a keyframe's own timestamp down puts it before the
frame it names and selects the previous one — the same fault again, smaller.
And the ffprobe window ends past the request, since an interval whose end is
the request never emits a keyframe sitting exactly on it: the resume position
is the one place a viewer asks for the same instant twice, and it would have
been answered a whole GOP early.
The test decodes the first frame served and matches it against the source
frame at the position announced, rather than comparing `start` to an expected
number — both sides of that comparison would be reading the same ffprobe and
would agree by construction.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UGY17EPph5LsLzePPXhUVc
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MSE decodes no in-band text track, so a subtitle cannot ride inside the
fragmented MP4 the player is fed. The node extracts one track whole, converts
it to WebVTT and caches it under its own hash; the client pulls that blob
through the ordinary file_req/chunk path and hangs a <track> on the video
element — the same indirection as a TMDB poster or an audio transcode, which
is what makes a film's subtitles extracted once in the life of the file rather
than once per viewing. Whole-file also makes the cues absolute, so a seek and
an audio-language change both leave the track untouched.
**The ordinal counts every subtitle stream, including the ones never listed.**
Only text codecs are offered: a bitmap track (PGS, VOBSUB — about a fifth of a
real library) has no path to WebVTT without OCR, and one extracted anyway
yields a header with no cues, which is a menu entry that shows nothing and
reports no error. Numbering the survivors of that filter would give a
PGS/SRT/SRT file the ordinals 0 and 1 for its text tracks and `-map 0:s:0`
would then extract the PGS — the same trap `AudioTrack.ordinal` exists for,
one level deeper. A fixture whose first subtitle stream cannot be decoded pins
it, and the handler checks membership of the probed list, never a range.
Additive and MINOR: the selector is drawn from `subtitle_tracks` in the node's
own `stream_init` and from no version number, so `subtitle_req` is never sent
to a peer that would not answer it. The floor stays at 3.0.
Also here: a failed extraction never touches playback, a superseded reply
cannot install its blob over a newer choice, and `_languageName` is shared
with the audio labels — lifted by both label harnesses, since a lift that
names one function stops covering the rule the moment logic moves out of it.
Tests: 9 node (tracks told apart by the words in the extracted cues, not by
tags), 10 client. Full suite green: 1545 node/common, 1252 hub.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UGY17EPph5LsLzePPXhUVc
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-ss before -i cannot trim copied video, which must begin on a keyframe, but
accurate_seek did trim the re-encoded audio to the exact request. Every seek
on a copied stream therefore opened with a GOP-wide hole in the audio and ran
a GOP out of sync afterwards — 9.979s on a real film with a 10s keyframe
interval. Accurate seeking is now off wherever video is copied, and stays on
where it is re-encoded, which is the only path that could already begin where
it was asked to.
Every timestamp was correct throughout, which is why nothing caught it; the
tests assert on decoded audio and on frames compared against the source.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The streaming path mapped 0:a:0 unconditionally, so a dubbed film played in
whichever language was muxed first and the others were unreachable. The node
now enumerates the tracks in stream_init and honours audio_track in
stream_req; switching is the seek path, since one ffmpeg carries one track.
MNP 3.2, additive: the player draws its selector from the node's own list and
never from a version number, so an older node is never asked for a track it
would ignore. MNP_MIN_SUPPORTED does not move.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The six MNP 3.1 ops were the only new ones never crossing a channel in a
test. Two cases on the existing aiortc harness: a round trip read back on
a second connection, and a 256 KB body. Found that the 1 MB body cap is
unreachable from a browser — docs/playlists.md §15.3.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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One row per playlist plus a manifest, so starring a track rewrites that
playlist rather than the whole collection. blob_enc is a BLOB, not
base64 TEXT: these run to hundreds of kilobytes.
user_id comes from the session and never from the message; kind is
validated against a pattern; every cap refuses with a stated reason
rather than truncating.
Additive, so MNP_MIN_SUPPORTED does not move — a 3.0 node answers
"unknown message type" and the client writes to the next one it reaches.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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`search_listed` is a per-group setting on the node, changed by a signed
operator op and carried in the sealed handshake ack. Search reads it after
the handshake and stops there: no index is fetched, cached or merged, in any
of the four views, and the page says how many groups it left out. The switch
is a "Search" section in the group's settings, shown to the operator.
Absent means listed, at every layer: roster default, ack default, and the
client only drops a group on an explicit `false` — so an upgrade or an older
node removes nothing from anyone's Search.
It is a listing preference and protects nothing: the node serves the same
index to Search and to the group page and cannot tell them apart, every
member lists the group by opening it, and a client that ignores the flag
lists it in Search too. Design §9.11 says so, so it is never described as
private. The cost is one handshake per unlisted group, because only the node
knows the setting.
Search also took `nodes[0]` twice — for the index and for the pooled
connection — the defect 4cce50f fixed on the group page only. One
`connectToGroup` now walks the list the same way: a refusal about this
browser stops, `not_hosted` or a failed connection moves on.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XuNrwLf5EFWCMHzfoEvnpm
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A node that hosts no groups sends no `group_ids` on its hub socket, and the
hub resolved the claim with `set(claimed_groups or authorized)` — so "I host
nothing" arrived as "I host every group this account belongs to", other
members' included. Such a node can serve none of them: it holds no GEK, and
its own handshake refuses them with "Group not hosted on this node".
`/v1/groups/{id}/nodes` answers in registration order and `_node_groups` is
in-memory, so which node a client was sent to depended on who reconnected
first after a hub restart. GroupPage took `nodes[0]` with no fallback. On
2026-09-11 a hub deploy at 20:14 reshuffled the registry, a second member's
unconfigured node won the race, and a group stopped opening for everyone in
it with its only real host online throughout. Any member could take one of
their groups down, by accident, by leaving an empty node running.
Four changes, because no one of them is sufficient:
- the hub never widens an absent claim, and `update_groups` goes through
the same ceiling as registration — it assigned its list verbatim, so the
bound that makes C2 hold at authentication was one message wide
- the node states the empty set rather than omitting the field
- the refusal carries `not_hosted`, so a client can tell "try the next
node" from "you, here, must do something first"
- GroupPage walks the list instead of indexing into it
The three lines involved date from 13, 20 and 23 August and each is
defensible alone. The defect is in the seam, which is where the last two
also were: a falsy empty collection must never mean "unspecified".
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T4YmK41VsEURWFdop4EEeT
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MESHBAY_NODE_PROTOCOL.md and playlists.md move into the repository, where a
reader can follow them.
The protocol reference was written against the tree before the cleanup landed
and described three things that no longer exist. Corrected here rather than
left to be discovered:
* member_upload is gone from the handshake ack and from the message
catalogue. Whether a member may write is a property of each root, and a
summary field beside the authoritative one is a second source for one
question — whichever the reader consults first decides it.
* video_root, audio_root and photo_roots are gone from the ack, the signed-op
table and the message reference. app_directories is not "the general form"
of three narrower ops any more; it is the only one. What survives is their
storage key on the node, because that is a key on an operator's disk rather
than on the wire, and a node upgraded into this has to find its own
configuration.
* The sender-key implementation the chat section pointed at has been deleted,
along with the ratchet. The argument for deriving a key per device stands on
its own now instead of pointing at a module to compare against.
playlists.md is added as written — a design for a feature that is not built, and
the first one to need per-account state spanning several groups on several
nodes. Its decided shape is summarised in MESHBAY_DESIGN.md section 9.10.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YVoHVCcfBqud6ZjG4db3y7
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