A FLV container does not carry per-frame EXIF the way a still camera does, so the TIFF files come out with empty EXIF blocks. The converter does embed a `creation_time` field pointing at the source frame timestamp, so you can re-sort the bundle in chronological order or correlate with subtitle / chapter markers.
Yes — the advanced timestamp option accepts a comma-separated list (e.g. `00:01:23, 00:05:00, 00:10:42.5`) and produces one TIFF file per timestamp. Useful for chapter thumbnails, scene reference shots, or building a contact sheet for review.