After Effects' Interpret Footage has Start Timecode: Use Source File
Timecode, or Override Start, which changes the timecode the footage
shows and leaves its frames alone. The Start Frame field that trimmed or
padded a sequence's head isn't in After Effects, so it is replaced.
Footage.start_timecode (Override Start, in frames at the footage's
rate; None = Use Source, 0 as file timecode isn't read) relabels source
time: the Footage panel's current time and footage.info's `timecode`
count from it. file.interpretFootage takes `overrideStart` and
`startTimecode` (timecode, read at the footage's rate after any frame
rate change, or a frame number, 0 to 1e9). It applies to every footage
with time, not only sequences, and Reload keeps it. A sequence's frames
always run from its first file's number to its last.
Test: start_timecode_only_relabels_source_time (project),
interpret_footage_start_timecode_relabels_source_time (engine: the
reply, the Footage panel's timecode, frame numbers, Use Source, the
footage's rate, bad values, undo), Reload keeps it, and the Interpret
Footage fields in ui_drag_drop.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
After Effects shows a missing frame of an image sequence as a
placeholder (colour bars) and has no Hold Previous Frame or Skip choice
in Interpret Footage, so EffectCraft doesn't either.
Interpret Footage loses its Missing Frames field, file.interpretFootage
its missingFrames parameter, and Footage its missing_frames setting. A
gap in a numbered sequence's numbering always shows colour bars. A
sequence imported with Force Alphabetical Order still plays its files
one after another (its numbering doesn't count), as in After Effects;
that is now an internal Footage.alphabetical flag, set on import and
kept by Reload. The Interpret Footage note lists the missing frames.
Projects saved before this have no such field and open with the After
Effects behaviour: a sequence with gaps shows placeholders where it
used to close them up.
Test: project sequence unit tests (placeholders, alphabetical order,
projects saved without the flag), tests_sequence (Start Frame instead
of Hold / Skip), sequence_gaps_show_placeholders (media) and the
Interpret Footage fields in ui_drag_drop.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Image sequences were found only by the desktop media prober: one picked
numbered still brought its whole run, with no way to import just that
frame, picking every frame made one sequence item per frame, the browser
couldn't make sequences at all, and a gap in the numbering closed up
silently.
The engine now groups numbered stills itself (engine/src/sequence.rs):
one picked file brings its run from its folder, several picked files of
one run import as that range, a picked or dropped folder imports its
files with each run as a sequence, and Force Alphabetical Order takes
every image of that type in the folder by name. `file.import` takes
`sequence` (default on), `alphabetical` and `frameRate`; Replace Footage,
Reload, proxies and render outputs probe the same way. The media layer
probes one file; the browser lists its file table for the run and
registers every frame with its media pool.
File > Import > File... asks, like After Effects' "PNG Sequence"
checkbox, whether picked numbered stills import as a sequence, with
Force Alphabetical Order and the frame rate. Sequences are named
`shot_[0001-0250].png`.
Interpret Footage gains Missing Frames (Show Placeholder, colour bars as
in After Effects, the new default; Hold Previous Frame; Skip) and Start
Frame (the frame number at the footage's first frame: trims or pads the
head). Saved projects keep Skip, so their sequences play as before.
Form notes keep a readable width and the form fits its rows, so OK stays
in view. docs/footage.md explains importing footage and sequences.
Test: tests_sequence (engine: run, picked range, every frame, Sequence
off, folder, alphabetical, Interpret Footage Missing Frames / Start
Frame, Replace Footage and Reload), project sequence unit tests,
sequence_gaps_show_placeholders_hold_or_close_up (media),
import_dialog_offers_the_image_sequence_option and
dropped_frames_import_as_one_sequence_with_sequence_interpretation (UI).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
bflatastic