Function export_fm2 

pub fn export_fm2(
    movie: &Movie,
    opts: &Fm2ExportOpts,
) -> Result<String, Fm2Error>

Serialize a Movie to .fm2 text.

Emits a version 3 header, then emuVersion, rerecordCount, palFlag (from Movie::region – both Region::Pal and Region::Dendy are PAL-timed, so both export palFlag 1), fourscore, port0/port1/port2 (all gamepad / none), the optional romFilename / romChecksum, an optional comment author line, then the |c|RLDUTSBA|RLDUTSBA|| input log (one line per frame, with a trailing empty port2 field per the spec).

Only StartPoint::PowerOn movies export; a StartPoint::SaveState movie has no portable .fm2 representation.

Errors

Returns Fm2Error::Unsupported if movie is anchored to an embedded save state.