Ffmpeg Captions

Context: $ARGUMENTS

CEA-608/708 closed captions are carried inside the H.264 video stream (A53 SEI NAL units) or in sidecar SCC/MCC/STL files. They are NOT subtitle tracks. For subtitle-file workflows (SRT/ASS/VTT), use the ffmpeg-subtitles skill.

Quick start

• Preserve captions during H.264 re-encode: → Step 3, -a53cc 1 recipe
• Check whether a file has embedded 608/708: → Step 1, detect
• Extract embedded CC to SRT: → Step 3, ccextractor recipe
• Remux without losing captions: → Step 3, passthrough recipe
• Burn captions into the picture: → Step 3, extract then hand off to ffmpeg-subtitles

When to use