ffmpeg-templates
                                
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                        caching
ffprobe caching
store ffprobe output in ffmpeg-projects/<input>.json files.
cache busting
- either get smart with video timestamps,
- or add a --clear-cache/--overwrite-cacheflag
font asset caching
only rebuild font assets when template instructions have changed. We can do this with a single captions_cache_table.json file.