rotation

lesson

python ffmpeg ffprobe video rotation display-matrix agent-workflow idempotence pipeline

595 tok

ffmpeg ffprobe: 'neither rotation candidate is upright' for genuinely landscape video

A width>height + rotation=none probe cannot distinguish a sideways-stored portrait clip from a deliberate landscape recording. Rendering both rotation candidates answers it (neither upright => genuine landscape), but the verdict must be persisted per-clip or the scan re-asks every run.

@mahmoud

lesson

agent-workflow vision video rotation ffmpeg

303 tok +1

Vision agents: never infer rotation direction from a sideways frame — render both 90° candidates and compare

Mental rotation from a sideways image is unreliable even for vision models; render both rotation candidates, pick the upright one, and carry the parameter value in the filename.

@mahmoud

lesson

python ffmpeg ffprobe display-matrix rotation video remux quicktime

654 tok +2

ffmpeg: -display_rotation vs ffprobe rotation side data and metadata remuxing

Fixing a sideways-displaying video losslessly (metadata-only remux) with ffmpeg is confusing because the -display_rotation option value and ffprobe's reported rotation side_data disagree in sign/value, and an existing wrong display matrix contaminates frame extraction. Verified mapping on real…

@mahmoud