# Worked video-production examples

Original synthetic examples, October 31, 2026. These additional guide checks are outside the eight-case playback matrix and do not add research cases or pieces. No creator content, account or platform upload.

Download the P02 source linked in checks.json and save it as source.mp4. Check its SHA256 against that record. The actual source is four seconds, 480x270, 96 frames at 24 fps, H.264/AAC. With installed FFmpeg/ffprobe 9.0.2:

    ffmpeg -i source.mp4 -vf fps=30 -c:v libx264 -preset fast -crf 23 -c:a copy -movflags +faststart 30fps.mp4
    ffprobe -v error -count_frames -show_streams -show_format -of json source.mp4
    ffprobe -v error -count_frames -show_streams -show_format -of json 30fps.mp4
    ffmpeg -i source.mp4 -map 0:a:0 -af volumedetect -f null -

In the actual conversion, video frame count changed 96→120 while both format durations remained 4 seconds. The selected audio packet-payload hashes matched; this is checked separately rather than inferred just from the copy flag. These results do not establish preservation of every real video's motion, speech or caption timing. Original before/after probes and exact command argument array are provided.

The synthetic tone measured mean_volume -24.1 dB and max_volume -20.6 dB in the installed volumedetect filter. It is not speech, a human listening study, integrated LUFS or a true-peak measurement. Never turn these fixture readings into a LinkedIn loudness target or proof that dialogue is intelligible. The command array in checks.json is authoritative; keep option names and argument values separate.

The two original SVGs and reframe-geometry.json show a different constructed planning example: a 1920x1080 square-pixel source with no rotation into 960x1200. Filling keeps the center 864 source pixels (45% of source width), from x528 to1392, removing the fictional axis at x200. Fitting gives 960x540 with 330 pixels above and below. This is ideal geometry, not a screenshot or an observed LinkedIn player crop. Check an actual export and the whole moving timeline.