joule-code/CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to the Joule Code standard are recorded here. The format fol
 
 ## [Unreleased]
 
+### Changed — `joule-moq-ingest`: the contribution link record's magic is `WLK1`
+
+- **Wire change.** `linkrec::MAGIC` is `WLK1` (WAI `extensions/live-contribution.md` §6.2), so the link record no
+  longer shares `WCL1` with WAI's clip record (live-recording §5.1), which had it first. A part written before this
+  change is refused as `malformed`; nothing else in the record changes. `joule-moq-ingest-link-vectors` writes
+  `.wlk1` files, and adds `clip_record_magic`, a part bearing the clip record's magic, refused `malformed`.
+
 ### Changed — `joule-moq-relay`: one object held once, and a socket that keeps what arrives
 
 - **`limits.quic_socket_buffer_bytes`** (4 MiB by default, and for the links a relay dials too): the

joule-code/joule-code-rs/crates/joule-moq-ingest/README.md

@@ -222,7 +222,7 @@ stream and the first AAC stream go to the video and audio tracks as WHIP's frame
 access unit (one ADTS frame) an object, the PTS on the room clock; a PES missing a packet is
 dropped whole. The catalog declares the owner's `link` track.
 
-**The link record** (`linkrec`, `WCL1`): every `[contrib] record_interval_ms` and when the
+**The link record** (`linkrec`, `WLK1`): every `[contrib] record_interval_ms` and when the
 session ends, the gateway signs a part: the sequence numbers passed, each delivered at the
 first try, recovered, dropped or outstanding, the loss runs, requests, retransmissions, round
 trips and recovery times, chained to the part before and naming each media track's receipt

joule-code/joule-code-rs/crates/joule-moq-ingest/gateway.example.toml

@@ -58,7 +58,7 @@ retry_after_s = 2                # what a 409 asks a player to wait
 
 [summary]
 # out_path = "sessions.jsonl"     # session records, one JSON line each; absent: kept in memory only
-# link_out_path = "links.hex"     # contribution link records (WCL1), one hexadecimal line each
+# link_out_path = "links.hex"     # contribution link records (WLK1), one hexadecimal line each
 
 [rtmp]
 # Enhanced RTMP ingest (live-ingest §12); off unless a listener is set.

joule-code/joule-code-rs/crates/joule-moq-ingest/src/bin/link_vectors.rs

@@ -1,5 +1,5 @@
 //! `joule-moq-ingest-link-vectors`: the conformance corpus of the contribution link record,
-//! `WCL1` (WAI `extensions/live-contribution.md` §6), written from fixed seeds, so the
+//! `WLK1` (WAI `extensions/live-contribution.md` §6), written from fixed seeds, so the
 //! same bytes every run.
 //!
 //! ```text
@@ -7,7 +7,7 @@
 //! joule-moq-ingest-link-vectors --check <wai/live-conformance/links>  regenerate and compare
 //! ```
 //!
-//! Each vector is a part (one `.wcl1` file) or a series (several, in order), with the
+//! Each vector is a part (one `.wlk1` file) or a series (several, in order), with the
 //! outcome §6.5 and §6.6 give it: accepted, or refused with its reason (and, in a series,
 //! the index of the part refused). Each refused vector breaks one rule and keeps every
 //! other: where a rule after the signature is broken, the record is signed again.
@@ -111,7 +111,7 @@ struct Out {
 
 impl Out {
     fn part(&mut self, name: &str, bytes: Vec<u8>, outcome: Result<(), Reason>, note: &str) {
-        let file = format!("{name}.wcl1");
+        let file = format!("{name}.wlk1");
         let mut v = json!({"name": name, "kind": "part", "files": [file], "note": note});
         match outcome {
             Ok(()) => {
@@ -132,7 +132,7 @@ impl Out {
     }
 
     fn series(&mut self, name: &str, parts: Vec<Vec<u8>>, outcome: Result<(), (usize, Reason)>, note: &str) {
-        let files: Vec<String> = (0..parts.len()).map(|i| format!("{name}.{i}.wcl1")).collect();
+        let files: Vec<String> = (0..parts.len()).map(|i| format!("{name}.{i}.wlk1")).collect();
         let mut v = json!({"name": name, "kind": "series", "files": files, "note": note});
         let got = linkrec::verify_series(&parts);
         match outcome {
@@ -204,7 +204,10 @@ fn corpus() -> Out {
     o.part("truncated", good[..good.len() - 1].to_vec(), Err(Reason::Truncated), "the signature's last byte missing");
     let mut b = good.clone();
     b[0] = b'X';
-    o.part("bad_magic", b, Err(Reason::Malformed), "not WCL1");
+    o.part("bad_magic", b, Err(Reason::Malformed), "not WLK1");
+    let mut b = good.clone();
+    b[..4].copy_from_slice(b"WCL1");
+    o.part("clip_record_magic", b, Err(Reason::Malformed), "the clip record's magic, WCL1 (live-recording §5.1)");
     let mut b = good.clone();
     b.push(0);
     o.part("trailing_byte", b, Err(Reason::Malformed), "a byte after the signature");
@@ -440,7 +443,7 @@ fn main() -> ExitCode {
         if let Ok(rd) = std::fs::read_dir(&dir) {
             for e in rd.flatten() {
                 let n = e.file_name().to_string_lossy().into_owned();
-                if (n.ends_with(".wcl1") || n == "vectors.json") && !files.contains_key(&n) {
+                if (n.ends_with(".wlk1") || n == "vectors.json") && !files.contains_key(&n) {
                     eprintln!("not generated: {n}");
                     bad += 1;
                 }

joule-code/joule-code-rs/crates/joule-moq-ingest/src/config.rs

@@ -544,7 +544,7 @@ pub struct SummaryConfig {
     /// Each session's record is appended here as one JSON line, when set.
     #[serde(default)]
     pub out_path: Option<PathBuf>,
-    /// Each contribution link record part (`WCL1`) is appended here, as one line of
+    /// Each contribution link record part (`WLK1`) is appended here, as one line of
     /// hexadecimal, when set.
     #[serde(default)]
     pub link_out_path: Option<PathBuf>,

joule-code/joule-code-rs/crates/joule-moq-ingest/src/contrib.rs

@@ -15,7 +15,7 @@
 //!   (live-ingest §7) and its arrival from the link as its arrival: the same objects,
 //!   groups, catalog and receipts as a WHIP session's (live-ingest §4 to §8).
 //! - **The link record.** Every `record_interval_ms`, and when the session ends, the gateway
-//!   signs a part of the link's `WCL1` record ([`crate::linkrec`]) and publishes it on the
+//!   signs a part of the link's `WLK1` record ([`crate::linkrec`]) and publishes it on the
 //!   owner's `link` track with its receipts: every sequence number delivered, recovered,
 //!   dropped or outstanding, the requests and the round trips, and the head of every media
 //!   track's receipt chain at the part's end.

joule-code/joule-code-rs/crates/joule-moq-ingest/src/gateway.rs

@@ -422,7 +422,7 @@ impl Gateway {
         self.rtmp.lock().unwrap().iter().map(|(k, h)| (k.clone(), h.frames.load(Ordering::Relaxed))).collect()
     }
 
-    /// Every contribution link record part (`WCL1`) signed so far.
+    /// Every contribution link record part (`WLK1`) signed so far.
     pub fn link_records(&self) -> Vec<Vec<u8>> {
         self.contrib.records.lock().unwrap().clone()
     }

joule-code/joule-code-rs/crates/joule-moq-ingest/src/lib.rs

@@ -25,7 +25,7 @@
 //! - **SRT and RIST** ([`contrib`]): contribution over UDP with retransmission, from
 //!   `joule-contrib`, into the same tracks: a one-time session from `/srt` or `/rist`
 //!   under the room grant, the transport stream demultiplexed, H.264, HEVC and AAC
-//!   carried; and the link's own record, `WCL1` ([`linkrec`]), signed part by part on the
+//!   carried; and the link's own record, `WLK1` ([`linkrec`]), signed part by part on the
 //!   owner's `link` track.
 //!
 //! The WebRTC stack is `str0m` (sans-IO, MIT OR Apache-2.0) with its pure-Rust crypto

joule-code/joule-code-rs/crates/joule-moq-ingest/src/linkrec.rs

@@ -1,4 +1,4 @@
-//! The contribution link record, `WCL1` (WAI `extensions/live-contribution.md` §6): what a
+//! The contribution link record, `WLK1` (WAI `extensions/live-contribution.md` §6): what a
 //! contribution link over SRT or RIST carried, lost, recovered and dropped, and how long it
 //! took, signed by the gateway that received it, part by part, each part chained to the one
 //! before and naming the head of every media track's receipt chain at its end.
@@ -11,7 +11,7 @@ use crate::room::{sha256, verify_strict, Reason as RoomReason};
 use ed25519_dalek::{Signer, SigningKey};
 use joule_contrib::stats::{Part, Run, Summary};
 
-pub const MAGIC: &[u8; 4] = b"WCL1";
+pub const MAGIC: &[u8; 4] = b"WLK1";
 pub const VERSION: u8 = 1;
 pub const DOMAIN: &[u8] = b"wai:contrib-link\x01";
 pub const MAX_TRACKS: usize = 8;

wai/CHANGELOG.md

@@ -6,6 +6,128 @@ wire format may change and such changes are recorded here.
 
 ## Unreleased
 
+### The contribution link record has its own magic, `WLK1`
+
+- **Wire change.** The contribution link record ([extensions/live-contribution.md](extensions/live-contribution.md)
+  §6.2) begins `WLK1`, no longer `WCL1`. The clip record of live-recording §5.1 had `WCL1` first; the link record,
+  added later, took the same four bytes, so a reader that tells records apart by their magic could not tell a link
+  record from a clip record, and the registry listed `WCL1` for the clip record alone. `WCL1` stays the clip
+  record's. A link record written before this change is `malformed` to a reader of this revision (§6.5 step 2), as a
+  new one is to a reader of the earlier revision; the signature's domain, `wai:contrib-link` 0x01, and every other
+  field are unchanged.
+- **The registry** lists `WLK1` as a magic of live-contribution §6.2 (REGISTRY.md and `codecs/registry.rs`).
+- **The corpus** [`live-conformance/links/`](live-conformance/links/) is regenerated with the new magic, each vector
+  file now `.wlk1`, and gains `clip_record_magic`: a part that bears the clip record's magic, refused `malformed`.
+  `live_contribution_verify.py` reads `WLK1`, and requires that a copy of each accepted part given the clip record's
+  magic is refused. `joule-moq-ingest` writes and reads `WLK1` (`linkrec::MAGIC`).
+- **The reverse:** a record with the link record's magic is not a clip record. The live-recording corpus
+  [`live-conformance/recordings/`](live-conformance/recordings/) gains the clip `link_record_magic`: chunk 4's clip
+  record beginning `WLK1` and signed under it, refused `malformed` at the clip (live-recording §5.2, which now names
+  `WLK1` among the other magics). `live_record_verify.py` requires the same refusal of a copy of each accepted clip
+  given `WLK1`.
+- **Breaking:** the corpus's index names the new files, and the files under the old magic are gone:
+  `record:corpus:wai/live-conformance/links/vectors.json`,
+  `record:corpus:wai/live-conformance/links/altered_count.wcl1`,
+  `record:corpus:wai/live-conformance/links/bad_key.wcl1`,
+  `record:corpus:wai/live-conformance/links/bad_magic.wcl1`,
+  `record:corpus:wai/live-conformance/links/bad_signature.wcl1`,
+  `record:corpus:wai/live-conformance/links/bytes_without_delivery.wcl1`,
+  `record:corpus:wai/live-conformance/links/count_mismatch.wcl1`,
+  `record:corpus:wai/live-conformance/links/empty_span.wcl1`,
+  `record:corpus:wai/live-conformance/links/first_part_with_parent.wcl1`,
+  `record:corpus:wai/live-conformance/links/first_try_over_delivered.wcl1`,
+  `record:corpus:wai/live-conformance/links/last_byte_two.wcl1`,
+  `record:corpus:wai/live-conformance/links/last_without_reason.wcl1`,
+  `record:corpus:wai/live-conformance/links/later_part_without_parent.wcl1`,
+  `record:corpus:wai/live-conformance/links/margin_past_window.wcl1`,
+  `record:corpus:wai/live-conformance/links/margin_without_recovery.wcl1`,
+  `record:corpus:wai/live-conformance/links/mode_unknown.wcl1`,
+  `record:corpus:wai/live-conformance/links/no_window.wcl1`,
+  `record:corpus:wai/live-conformance/links/outstanding_not_last.wcl1`,
+  `record:corpus:wai/live-conformance/links/protocol_unknown.wcl1`,
+  `record:corpus:wai/live-conformance/links/reason_unknown.wcl1`,
+  `record:corpus:wai/live-conformance/links/reason_without_last.wcl1`,
+  `record:corpus:wai/live-conformance/links/recovery_disordered.wcl1`,
+  `record:corpus:wai/live-conformance/links/recovery_empty_with_figures.wcl1`,
+  `record:corpus:wai/live-conformance/links/recovery_samples.wcl1`,
+  `record:corpus:wai/live-conformance/links/requested_below_requests.wcl1`,
+  `record:corpus:wai/live-conformance/links/rist_main_aes192.wcl1`,
+  `record:corpus:wai/live-conformance/links/rist_main_psk256.wcl1`,
+  `record:corpus:wai/live-conformance/links/rist_simple.wcl1`,
+  `record:corpus:wai/live-conformance/links/rist_simple_encrypted.wcl1`,
+  `record:corpus:wai/live-conformance/links/rtt_disordered.wcl1`,
+  `record:corpus:wai/live-conformance/links/rtt_empty_with_figures.wcl1`,
+  `record:corpus:wai/live-conformance/links/run_empty.wcl1`,
+  `record:corpus:wai/live-conformance/links/run_outside.wcl1`,
+  `record:corpus:wai/live-conformance/links/run_overfull.wcl1`,
+  `record:corpus:wai/live-conformance/links/run_overfull_alone.wcl1`,
+  `record:corpus:wai/live-conformance/links/runs_overlap.wcl1`,
+  `record:corpus:wai/live-conformance/links/runs_past_bound.wcl1`,
+  `record:corpus:wai/live-conformance/links/runs_short.wcl1`,
+  `record:corpus:wai/live-conformance/links/runs_truncated.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_head_moved_without_groups.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_head_moved_without_groups.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_cipher.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_cipher.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_grant.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_grant.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_hop.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_hop.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_mode.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_mode.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_principal.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_principal.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_protocol.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_protocol.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_room.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_room.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_session.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_session.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_window.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_other_window.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_part_after_last.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_part_after_last.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_sequence_gap.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_sequence_gap.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_skips_a_part.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_skips_a_part.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_skips_a_part.2.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_starts_late.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_starts_late.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_three_parts.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_three_parts.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_three_parts.2.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_time_gap.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_time_gap.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_track_added.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_track_added.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_track_added.2.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_track_alias_changed.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_track_alias_changed.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_track_dropped.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_track_dropped.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_wrong_parent.0.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_wrong_parent.1.wcl1`,
+  `record:corpus:wai/live-conformance/links/series_wrong_parent.2.wcl1`,
+  `record:corpus:wai/live-conformance/links/small_order_r.wcl1`,
+  `record:corpus:wai/live-conformance/links/srt_caller_aes192.wcl1`,
+  `record:corpus:wai/live-conformance/links/srt_cipher_100.wcl1`,
+  `record:corpus:wai/live-conformance/links/srt_last_outstanding.wcl1`,
+  `record:corpus:wai/live-conformance/links/srt_listener_clean.wcl1`,
+  `record:corpus:wai/live-conformance/links/srt_recovered.wcl1`,
+  `record:corpus:wai/live-conformance/links/too_large.wcl1`,
+  `record:corpus:wai/live-conformance/links/track_head_without_groups.wcl1`,
+  `record:corpus:wai/live-conformance/links/track_zero_digest.wcl1`,
+  `record:corpus:wai/live-conformance/links/tracks_not_begun.wcl1`,
+  `record:corpus:wai/live-conformance/links/tracks_past_bound.wcl1`,
+  `record:corpus:wai/live-conformance/links/tracks_unsorted.wcl1`,
+  `record:corpus:wai/live-conformance/links/trailing_byte.wcl1`,
+  `record:corpus:wai/live-conformance/links/truncated.wcl1`,
+  `record:corpus:wai/live-conformance/links/truncated_byte_two.wcl1`,
+  `record:corpus:wai/live-conformance/links/truncated_not_full.wcl1`,
+  `record:corpus:wai/live-conformance/links/two_dropped.wcl1`,
+  `record:corpus:wai/live-conformance/links/unknown_version.wcl1`.
+
 ### Tariff version 6: a job priced per endpoint, a third party's usage billed, and an upscale and a tone mapping billed by what re-derives them
 
 - **Tariff and invoice version 6** ([extensions/receipt-ledger.md](extensions/receipt-ledger.md) §4.9). A job price names

wai/REGISTRY.md

@@ -407,6 +407,7 @@ and a role are fixed once registered.
 | `WKL1` | magic | defined | key-release §4.1 |
 | `WKT1` | magic | defined | key-release §9.3 |
 | `WLI1` | magic | defined | receipt-ledger §6.1 |
+| `WLK1` | magic | defined | live-contribution §6.2 |
 | `WLT1` | magic | defined | receipt-ledger §4.1 |
 | `WLU1` | magic | defined | channel-lineup §6.1 |
 | `WMA1` | magic | defined | live-messaging §8 |

wai/SPEC.md

@@ -1098,7 +1098,7 @@ And for **contribution over UDP with retransmission** — `wai.live.contribution
 Profile, VSF TR-06-2:2024 Main Profile), each admitted by a one-time session a publisher
 obtains under its room grant, its MPEG transport stream demultiplexed into the room's tracks
 as one envelope an access unit with first-hop receipts. The gateway signs the **link
-record**, `WCL1`, part by part: every sequence number delivered at the first try,
+record**, `WLK1`, part by part: every sequence number delivered at the first try,
 recovered within the receive window, dropped, or outstanding when the link ended, the
 retransmission requests, the round trips and the recovery times, each part chained to the
 one before and naming the head of every media track's receipt chain; a verifier recomputes

wai/extensions/live-contribution.md

@@ -7,7 +7,7 @@
 > session under its room grant; its encoder sends an MPEG transport stream over the
 > transport; the gateway demultiplexes it and carries each access unit as one envelope on
 > the room's tracks with first-hop receipts, as it carries a WHIP publisher's frames.
-> Registers the record `wai.live.contribution`: the **contribution link record**, `WCL1`,
+> Registers the record `wai.live.contribution`: the **contribution link record**, `WLK1`,
 > which the gateway signs part by part while the link runs: what became of every sequence
 > number (delivered at the first try, recovered within the receive window, dropped when its
 > time passed, or outstanding when the link ended), the retransmission requests and the
@@ -339,7 +339,7 @@ measured before the first sequence number fall into the first part.
 
 | field | size | meaning |
 |---|---|---|
-| `magic` | 4 | `WCL1` (ASCII) |
+| `magic` | 4 | `WLK1` (ASCII) |
 | `version` | 1 | 1 |
 | `room` | 32 | the room id |
 | `hop` | 32 | the gateway's key, which signs the record and the tracks' receipts |
@@ -416,8 +416,9 @@ fails, with its reason:
 1. The record is at most 11 295 bytes (§6.7): otherwise `record_too_large`.
 2. It reads, field by field in §6.2's order, to exactly its last byte, with `tracks` at most
    8 and runs at most 512: `truncated` when it ends early; `unknown_version` for a version
-   other than 1; `malformed` for another magic, a byte after `sig`, a count past its bound,
-   or a `last` or `truncated` other than 0 and 1.
+   other than 1; `malformed` for another magic (live-recording §5.1's clip record, `WCL1`,
+   among them), a byte after `sig`, a count past its bound, or a `last` or `truncated` other
+   than 0 and 1.
 3. The signature verifies under `hop`, strictly, as SPEC §7 *Signatures* requires: a key
    that fails that rule's steps 1 or 2 is `bad_key`, a signature that fails a later step
    `bad_signature`.

wai/extensions/live-recording.md

@@ -345,8 +345,9 @@ start and `trim_out` at the end; the clip's bytes are its parts'.
 ### 5.2 Reading and rules
 
 A reader reads exactly the bytes it is given, as live-events §3.3 reads a record with
-`WCL1` for `WEV1` (`truncated`, `malformed`, `unknown_version`), and refuses a record that
-breaks any of these rules as `clip_record_invalid`:
+`WCL1` for `WEV1` (`truncated`, `malformed`, `unknown_version`; another magic is
+`malformed`, live-contribution §6.2's link record, `WLK1`, among them), and refuses a
+record that breaks any of these rules as `clip_record_invalid`:
 
 - *k* is 1 to 16, and no take is named by two parts;
 - in each part, `count` is at least 1; each chunk's `index` is `first` plus its position,

wai/live-conformance/links/README.md

@@ -1,4 +1,4 @@
-# links — the contribution link record, `WCL1`
+# links — the contribution link record, `WLK1`
 
 The corpus of [live-contribution](../../extensions/live-contribution.md) §6: parts of the
 link record a gateway signs while it receives an SRT or RIST link, and series of them.
@@ -8,7 +8,7 @@ link record a gateway signs while it receives an SRT or RIST link, and series of
   the index of the part refused), for an accepted part its `digest` and a `summary` of its
   fields, and a `note` on what it shows. `hop` is the signing key, `hop_seed` the seed it is
   made from, so anyone can sign a new vector the same way.
-- Each `.wcl1` file is one record's bytes.
+- Each `.wlk1` file is one record's bytes.
 
 Accepted vectors cover each protocol and mode, each key length, a session's last part with
 sequence numbers outstanding, a part whose loss runs are truncated, tracks not yet begun,