Add image-sequence to ProRes encoding

JPG/PNG/TIFF/EXR/DPX frame folders can now be queued and encoded to .mov
alongside regular video files. A new "Add image sequence" entry point picks
a folder, auto-detects sequences inside, and queues each as its own job.
Frame rate is set globally in the settings pane (default 24 fps, presets +
free-form spinner) and persists across launches.

ffmpeg input switches to the image2 demuxer (-framerate / -start_number / -i
<pattern>) with no audio mapping and no hwaccel. EXR/DPX also get
-vsync passthrough. Progress parsing is unchanged — we set
job.duration = frame_count / fps so the existing out_time_us math is correct
for sequences. Output naming reuses the suffix rule with the stripped stem
(shot_####.png -> shot_prores_hq.mov).

nocoder/config.py

@@ -13,7 +13,8 @@ Schema (all keys optional):
         "naming":  "suffix" | "keep",
         "audio_bits": 16 | 24,
         "auto_reveal": false,
-        "cpu_pane_expanded": true
+        "cpu_pane_expanded": true,
+        "sequence_fps": 24.0
     }
 """
 from __future__ import annotations

nocoder/data.py

@@ -55,6 +55,24 @@ def is_video_path(path: str) -> bool:
     return any(lower.endswith(ext) for ext in VIDEO_EXTENSIONS)
 
 
+# Image-sequence frame formats accepted by the "Add image sequence folder…"
+# entry point. ffmpeg's image2 demuxer handles all five natively; EXR/DPX
+# dither to 10-bit ProRes (lossless for 8-bit JPG/PNG, lossy headroom-wise
+# for floating-point EXR).
+SEQUENCE_EXTENSIONS: frozenset[str] = frozenset({
+    ".jpg", ".jpeg",
+    ".png",
+    ".tif", ".tiff",
+    ".exr",
+    ".dpx",
+})
+
+
+def is_sequence_frame_path(path: str) -> bool:
+    lower = path.lower()
+    return any(lower.endswith(ext) for ext in SEQUENCE_EXTENSIONS)
+
+
 # Subdirectory names to SKIP when recursively walking a dropped folder or
 # camera card. The names match case-insensitively.
 #

nocoder/encoder.py

@@ -116,6 +116,46 @@ class Metadata:
         return "—"
 
 
+@dataclass
+class SequenceSpec:
+    """A detected image sequence (group of numbered frames in a folder).
+
+    Built by `sequence_scan.scan_folder()`. Drives the ffmpeg image2-demuxer
+    input form: `-framerate FPS -start_number N -i <dir>/<prefix>%0Pd<ext>`.
+    """
+    dir: str             # absolute folder containing the frames
+    prefix: str          # stem before the digit run; "" if frames are pure digits
+    ext: str             # ".png" / ".exr" / ... (lowercase, leading dot)
+    padding: int         # 4 for shot_0001.png; 0 for unpadded
+    start_frame: int
+    frame_count: int     # frames actually found in the group
+    expected_frames: int # max - min + 1; > frame_count means there are gaps
+    fps: float           # at queue time, from settings.sequence_fps
+
+    @property
+    def pattern_basename(self) -> str:
+        digits = f"%0{self.padding}d" if self.padding > 0 else "%d"
+        return f"{self.prefix}{digits}{self.ext}"
+
+    @property
+    def pattern_path(self) -> str:
+        return str(Path(self.dir) / self.pattern_basename)
+
+    @property
+    def stripped_stem(self) -> str:
+        # Output naming base: trim trailing _ . - left after stripping digits.
+        # Pure-digit frames (prefix == "") fall back to the folder name.
+        return self.prefix.rstrip("_.-") or Path(self.dir).name
+
+    @property
+    def first_frame_path(self) -> str:
+        if self.padding > 0:
+            name = f"{self.prefix}{self.start_frame:0{self.padding}d}{self.ext}"
+        else:
+            name = f"{self.prefix}{self.start_frame}{self.ext}"
+        return str(Path(self.dir) / name)
+
+
 def probe_metadata(path: str) -> Metadata:
     """Run ffprobe synchronously. Callers should invoke from a worker thread.
 
@@ -178,6 +218,55 @@ def probe_metadata(path: str) -> Metadata:
     return meta
 
 
+def probe_sequence_metadata(spec: SequenceSpec) -> Metadata:
+    """Build a Metadata for an image sequence without running probe_metadata.
+
+    probe_metadata expects a single demuxable file; the image2-demuxer pattern
+    can't be ffprobed directly. We synthesise duration/fps from the spec, then
+    ffprobe just the first frame for width/height/pix_fmt (so the alpha flag
+    is accurate when the user picks 4444+alpha against a real RGBA EXR/PNG).
+    """
+    duration = spec.frame_count / spec.fps if spec.fps > 0 else 0.0
+    meta = Metadata(
+        duration=duration,
+        codec=spec.ext.lstrip(".").upper(),
+        fps=spec.fps,
+        audio_stream_indexes=[],
+    )
+    first = spec.first_frame_path
+    try:
+        proc = subprocess.run(
+            [
+                FFPROBE, "-v", "error",
+                "-select_streams", "v:0",
+                "-show_entries", "stream=width,height,pix_fmt",
+                "-of", "json",
+                first,
+            ],
+            capture_output=True, text=True, timeout=10, check=False,
+        )
+    except (FileNotFoundError, subprocess.TimeoutExpired):
+        return meta
+    if proc.returncode != 0 or not proc.stdout:
+        return meta
+    try:
+        data = json.loads(proc.stdout)
+    except json.JSONDecodeError:
+        return meta
+    streams = data.get("streams") or []
+    if not streams:
+        return meta
+    stream = streams[0]
+    try:
+        meta.width = int(stream.get("width") or 0)
+        meta.height = int(stream.get("height") or 0)
+    except (TypeError, ValueError):
+        pass
+    pix_fmt = (stream.get("pix_fmt") or "").lower()
+    meta.alpha = _pix_fmt_has_alpha(pix_fmt)
+    return meta
+
+
 # Concrete pixel-format tokens that carry an alpha channel. The earlier
 # heuristic (`"a" in pix_fmt.split("p", 1)[0]`) misfired on grayscale formats
 # because "gray" contains the letter 'a'.
@@ -218,6 +307,13 @@ def _human_codec(name: str) -> str:
     return _CODEC_NAMES.get(name.lower(), name.upper() if name else "")
 
 
+def _format_fps(fps: float) -> str:
+    """ffmpeg-friendly fps string — int if whole, else 3-decimal."""
+    if fps == int(fps):
+        return str(int(fps))
+    return f"{fps:.3f}".rstrip("0").rstrip(".")
+
+
 def build_command(
     src: str,
     out: str,
@@ -226,6 +322,7 @@ def build_command(
     encoder: str,
     audio_indexes: Optional[list[int]] = None,
     audio_bits: int = 16,
+    sequence: Optional[SequenceSpec] = None,
 ) -> list[str]:
     """Assemble the ffmpeg command list for a single encode.
 
@@ -239,6 +336,10 @@ def build_command(
       audio_indexes is None          → fallback `-map 0:a:0?` (first audio,
                                         optional) for ad-hoc callers who
                                         haven't probed yet
+
+    `sequence`, when set, switches the input to the image2 demuxer
+    (`-framerate FPS -start_number N -i <pattern>`) and forces no-audio. The
+    `src` arg is ignored for sequences; pass the first-frame path or "" for it.
     """
     profile = PROFILES_BY_ID[profile_id]
     pix_fmt = pick_pixel_format(profile_id, alpha)
@@ -246,6 +347,21 @@ def build_command(
         FFMPEG, "-hide_banner", "-loglevel", "error", "-y",
         "-nostdin",
     ]
+    if sequence is not None:
+        # image2 demuxer: deterministic frame ordering via %0Nd, no hwaccel
+        # (it's decoder-side, irrelevant for still-image input), no audio.
+        # -vsync passthrough on EXR/DPX keeps ffmpeg from dropping/duplicating
+        # frames when the file mtimes look unusual.
+        if sequence.ext in (".exr", ".dpx"):
+            cmd += ["-vsync", "passthrough"]
+        cmd += [
+            "-framerate", _format_fps(sequence.fps),
+            "-start_number", str(sequence.start_frame),
+            "-i", sequence.pattern_path,
+            "-map", "0:v:0",
+        ]
+        has_audio = False
+    else:
         hw = get_hwaccel()
         if hw:
             # ffmpeg silently falls back to CPU decode for codecs the GPU can't
@@ -285,16 +401,40 @@ def build_command(
     return cmd
 
 
-def format_preview_command(src_name: str, out_path: str, profile_id: str, alpha: bool, audio_bits: int = 16) -> str:
+def format_preview_command(
+    src_name: str,
+    out_path: str,
+    profile_id: str,
+    alpha: bool,
+    audio_bits: int = 16,
+    sequence: Optional[SequenceSpec] = None,
+) -> str:
     """Pretty multi-line preview for the ffmpeg command box. Uses prores_ks always.
 
     The real command maps each known audio stream by absolute index; the
     preview shows `0:a?` (glob-all) for brevity — the runtime behaviour is
     equivalent when every audio stream is known-codec.
+
+    When `sequence` is provided, renders the image2-demuxer form (no hwaccel,
+    no audio map / codec) using shlex-quoted pattern path.
     """
     profile = PROFILES_BY_ID[profile_id]
     pix_fmt = pick_pixel_format(profile_id, alpha)
     alpha_flag = " -alpha_bits 16" if (alpha and profile.pid >= 4) else ""
+    if sequence is not None:
+        vsync_line = "  -vsync passthrough \\\n" if sequence.ext in (".exr", ".dpx") else ""
+        return (
+            "ffmpeg -hide_banner -y \\\n"
+            + vsync_line
+            + f"  -framerate {_format_fps(sequence.fps)} \\\n"
+            + f"  -start_number {sequence.start_frame} \\\n"
+            + f"  -i {shlex.quote(sequence.pattern_path)} \\\n"
+            "  -map 0:v:0 \\\n"
+            f"  -c:v prores_ks -profile:v {profile.id} \\\n"
+            f"  -pix_fmt {pix_fmt}{alpha_flag} \\\n"
+            "  -movflags +use_metadata_tags \\\n"
+            f"  {shlex.quote(out_path)}"
+        )
     hw = get_hwaccel()
     hw_line = f"  -hwaccel {hw} \\\n" if hw else ""
     audio_codec = "pcm_s24le" if audio_bits == 24 else "pcm_s16le"
@@ -311,9 +451,19 @@ def format_preview_command(src_name: str, out_path: str, profile_id: str, alpha:
     )
 
 
-def plan_output_path(src: str, out_dir: str, naming: str, profile_id: str) -> str:
+def plan_output_path(
-    """Output path rules from prowrap-yad.sh: keep vs suffix, with ' (N)' disambiguation."""
+    src: str,
-    stem = Path(src).stem
+    out_dir: str,
+    naming: str,
+    profile_id: str,
+    stem_override: Optional[str] = None,
+) -> str:
+    """Output path rules from prowrap-yad.sh: keep vs suffix, with ' (N)' disambiguation.
+
+    `stem_override`, when given, replaces the filename-derived stem. Used for
+    image-sequence jobs where the "name" comes from a SequenceSpec, not a file.
+    """
+    stem = stem_override if stem_override is not None else Path(src).stem
     if naming == "suffix":
         base = f"{stem}_prores_{profile_id}"
     else:
@@ -344,6 +494,12 @@ class EncodeJob:
     # build_command can map each known audio stream by absolute index.
     # Empty list = silent video; None = no probe info (safe fallback applies).
     audio_stream_indexes: Optional[list[int]] = None
+    # When set, this is an image-sequence job, not a single-file job. `src`
+    # still carries the first-frame path (load-bearing for `_copy_mtime` and
+    # the orphan marker), but the ffmpeg input form switches to image2.
+    # `duration` should be set to `frame_count / fps` by the caller so the
+    # existing -progress parser produces correct percentages.
+    sequence: Optional[SequenceSpec] = None
     cancel_event: threading.Event = field(default_factory=threading.Event)
     _proc: Optional[subprocess.Popen] = None
 
@@ -363,7 +519,11 @@ def run_encode(job: EncodeJob, profile_id: str, alpha: bool, encoder: str, audio
         job.on_done(False, "cancelled")
         return
 
-    cmd = build_command(job.src, job.out, profile_id, alpha, encoder, job.audio_stream_indexes, audio_bits)
+    cmd = build_command(
+        job.src, job.out, profile_id, alpha, encoder,
+        job.audio_stream_indexes, audio_bits,
+        sequence=job.sequence,
+    )
     try:
         proc = subprocess.Popen(
             cmd,

nocoder/queue_pane.py

@@ -30,7 +30,7 @@ gi.require_version("GObject", "2.0")
 from gi.repository import GdkPixbuf, GLib, GObject, Gdk, Gio, Gtk
 
 from .data import VIDEO_EXTENSIONS, format_bytes, format_duration
-from .encoder import Metadata
+from .encoder import Metadata, SequenceSpec
 
 
 @dataclass
@@ -43,11 +43,21 @@ class FileEntry:
     status: str = "queued"  # queued | encoding | done | failed
     progress: float = 0.0   # 0..1
     error: Optional[str] = None
+    # When set, this entry is an image-sequence job. `path` still carries the
+    # first-frame path (load-bearing for dedupe, mtime copy, etc.); the
+    # `display_name` and the ffmpeg input form derive from the spec.
+    sequence: Optional[SequenceSpec] = None
 
     @property
     def name(self) -> str:
         return os.path.basename(self.path)
 
+    @property
+    def display_name(self) -> str:
+        if self.sequence is None:
+            return self.name
+        return f"{self.sequence.stripped_stem}{self.sequence.ext} ×{self.sequence.frame_count}"
+
 
 class QueuePane(Gtk.Box):
     __gtype_name__ = "NoCoderQueuePane"
@@ -55,6 +65,7 @@ class QueuePane(Gtk.Box):
     __gsignals__ = {
         "add-files-requested": (GObject.SignalFlags.RUN_LAST, None, ()),
         "add-folder-requested": (GObject.SignalFlags.RUN_LAST, None, ()),
+        "add-sequence-folder-requested": (GObject.SignalFlags.RUN_LAST, None, ()),
         "clear-requested": (GObject.SignalFlags.RUN_LAST, None, ()),
         "files-dropped": (GObject.SignalFlags.RUN_LAST, None, (object,)),
         "selection-changed": (GObject.SignalFlags.RUN_LAST, None, (str,)),
@@ -122,6 +133,18 @@ class QueuePane(Gtk.Box):
         add_folder.connect("clicked", lambda _b: self.emit("add-folder-requested"))
         self._action_bar.append(add_folder)
 
+        add_sequence = Gtk.Button()
+        add_sequence.add_css_class("muted-btn")
+        add_sequence.set_child(_icon_label("image-x-generic-symbolic", "Add image sequence"))
+        add_sequence.set_tooltip_text(
+            "Pick a folder of numbered image frames (JPG/PNG/TIFF/EXR/DPX). "
+            "Frame rate comes from the Sequence FPS setting."
+        )
+        add_sequence.connect(
+            "clicked", lambda _b: self.emit("add-sequence-folder-requested")
+        )
+        self._action_bar.append(add_sequence)
+
         spacer = Gtk.Box()
         spacer.set_hexpand(True)
         self._action_bar.append(spacer)
@@ -196,6 +219,17 @@ class QueuePane(Gtk.Box):
         secondary.set_child(_icon_label("folder-symbolic", "Add folder"))
         secondary.connect("clicked", lambda _b: self.emit("add-folder-requested"))
         buttons.append(secondary)
+
+        sequence_btn = Gtk.Button()
+        sequence_btn.add_css_class("muted-btn")
+        sequence_btn.set_child(_icon_label("image-x-generic-symbolic", "Image sequence"))
+        sequence_btn.set_tooltip_text(
+            "Pick a folder of numbered image frames (JPG/PNG/TIFF/EXR/DPX)."
+        )
+        sequence_btn.connect(
+            "clicked", lambda _b: self.emit("add-sequence-folder-requested")
+        )
+        buttons.append(sequence_btn)
         drop.append(buttons)
 
         hint = Gtk.Label()
@@ -560,7 +594,7 @@ def _icon_label(icon_name: str, text: str) -> Gtk.Widget:
 
 
 def _populate_row(row: Gtk.ListBoxRow, entry: FileEntry, widgets: dict) -> None:
-    widgets["name"].set_text(entry.name)
+    widgets["name"].set_text(entry.display_name)
     # Meta
     meta_box: Gtk.Box = widgets["meta_box"]
     _clear_children(meta_box)
@@ -575,6 +609,17 @@ def _populate_row(row: Gtk.ListBoxRow, entry: FileEntry, widgets: dict) -> None:
         parts.append((format_duration(entry.meta.duration), None))
     if entry.meta.alpha:
         parts.append(("α", "alpha-mark"))
+    if entry.sequence is not None:
+        # Surface the frame count + any gap warning. The frame_count vs
+        # expected_frames divergence is informational — ffmpeg will halt at
+        # the first missing frame, so the user wants to know up front.
+        spec = entry.sequence
+        if spec.frame_count == spec.expected_frames:
+            parts.append((f"{spec.frame_count} frames", None))
+        else:
+            parts.append(
+                (f"{spec.frame_count}/{spec.expected_frames} frames", "alpha-mark")
+            )
     if not parts:
         lbl = Gtk.Label(label="probing…", xalign=0)
         meta_box.append(lbl)

nocoder/sequence_scan.py

@@ -0,0 +1,116 @@
+"""Detect image sequences in a folder.
+
+The "Add image sequence folder…" entry point picks a folder and we look for
+groups of numbered frames inside it. A sequence is a set of files sharing a
+filename prefix and extension, differing only in a trailing digit run, with
+consistent zero-padding (so `shot_001.png` and `shot_0001.png` in the same
+folder are treated as two distinct sequences — that matches ffmpeg's `%0Nd`
+semantics).
+
+We don't require contiguity: a group with gaps still encodes (`expected_frames
+> frame_count` signals the gap so the UI can warn). ffmpeg will halt at the
+first missing frame at encode time.
+"""
+from __future__ import annotations
+
+import os
+import re
+from pathlib import Path
+
+from .data import SEQUENCE_EXTENSIONS
+from .encoder import SequenceSpec
+
+# Anchor on the *last* digit run in the stem so `scene_01_v2_0001.png` becomes
+# (prefix="scene_01_v2_", digits="0001"), not (prefix="scene_", digits="01").
+_TRAILING_DIGITS_RE = re.compile(r"^(.*?)(\d+)$")
+
+
+def scan_folder(directory: str, fps: float) -> list[SequenceSpec]:
+    """Return all image sequences found directly in `directory` (no recursion).
+
+    Hidden files (leading dot) and unsupported extensions are ignored. Groups
+    with fewer than 2 frames are dropped (a stray `thumb.jpg` next to a video
+    folder shouldn't queue itself as a one-frame sequence).
+    """
+    try:
+        entries = os.listdir(directory)
+    except OSError:
+        return []
+
+    # group_key -> {"frames": [(num_int, name)], "prefix": str, "ext": str, "padding": int}
+    groups: dict[tuple[str, str, int], dict] = {}
+    for name in entries:
+        if name.startswith("."):
+            continue
+        full = os.path.join(directory, name)
+        if not os.path.isfile(full):
+            continue
+        ext = Path(name).suffix.lower()
+        if ext not in SEQUENCE_EXTENSIONS:
+            continue
+        stem = Path(name).stem
+        m = _TRAILING_DIGITS_RE.match(stem)
+        if not m:
+            continue
+        prefix, digits = m.group(1), m.group(2)
+        padding = len(digits)
+        key = (prefix, ext, padding)
+        try:
+            num = int(digits)
+        except ValueError:
+            continue
+        g = groups.setdefault(
+            key,
+            {"frames": [], "prefix": prefix, "ext": ext, "padding": padding},
+        )
+        g["frames"].append((num, name))
+
+    specs: list[SequenceSpec] = []
+    for g in groups.values():
+        frames = g["frames"]
+        if len(frames) < 2:
+            continue
+        frames.sort(key=lambda t: t[0])
+        nums = [n for n, _ in frames]
+        start = nums[0]
+        end = nums[-1]
+        specs.append(
+            SequenceSpec(
+                dir=os.path.abspath(directory),
+                prefix=g["prefix"],
+                ext=g["ext"],
+                padding=g["padding"],
+                start_frame=start,
+                frame_count=len(frames),
+                expected_frames=end - start + 1,
+                fps=fps,
+            )
+        )
+
+    specs.sort(key=lambda s: (s.prefix, s.ext, s.padding))
+    return specs
+
+
+def sum_frame_sizes(spec: SequenceSpec) -> int:
+    """Total bytes of all frames in the sequence (best-effort)."""
+    total = 0
+    try:
+        for name in os.listdir(spec.dir):
+            if name.startswith("."):
+                continue
+            stem = Path(name).stem
+            if Path(name).suffix.lower() != spec.ext:
+                continue
+            m = _TRAILING_DIGITS_RE.match(stem)
+            if not m:
+                continue
+            prefix, digits = m.group(1), m.group(2)
+            if prefix != spec.prefix or len(digits) != spec.padding:
+                continue
+            try:
+                total += os.path.getsize(os.path.join(spec.dir, name))
+            except OSError:
+                continue
+    except OSError:
+        return 0
+    return total

nocoder/settings_pane.py

@@ -17,7 +17,14 @@ from gi.repository import GObject, Gtk, Pango
 
 from .config import load_config
 from .data import PROFILES, PROFILES_BY_ID
-from .encoder import format_preview_command
+from .encoder import SequenceSpec, format_preview_command
+
+
+def _fmt_fps_preset(v: float) -> str:
+    """Compact preset label: 24 / 25 / 23.976 / 29.97."""
+    if v == int(v):
+        return f"{int(v)} fps"
+    return f"{v:g} fps"
 
 
 def _resolve_theme_hex(widget: Gtk.Widget, name: str, fallback: str) -> str:
@@ -41,7 +48,10 @@ def _resolve_theme_hex(widget: Gtk.Widget, name: str, fallback: str) -> str:
 
 
 class Settings:
-    __slots__ = ("profile", "alpha", "naming", "out_dir", "audio_bits", "auto_reveal")
+    __slots__ = (
+        "profile", "alpha", "naming", "out_dir", "audio_bits",
+        "auto_reveal", "sequence_fps",
+    )
 
     def __init__(
         self,
@@ -51,6 +61,7 @@ class Settings:
         out_dir: str = "",
         audio_bits: int = 16,
         auto_reveal: bool = False,
+        sequence_fps: float = 24.0,
     ) -> None:
         self.profile = profile
         self.alpha = alpha
@@ -63,11 +74,15 @@ class Settings:
         # batch completes. Convenient for one-shot transcodes; off by default
         # so the app doesn't surprise users mid-workflow.
         self.auto_reveal = auto_reveal
+        # Applied to every image-sequence job added via "Add image sequence
+        # folder…". 24 matches cinematic default; common alternates exposed
+        # as a preset dropdown next to the spin button.
+        self.sequence_fps = sequence_fps
 
     def snapshot(self) -> "Settings":
         return Settings(
             self.profile, self.alpha, self.naming, self.out_dir,
-            self.audio_bits, self.auto_reveal,
+            self.audio_bits, self.auto_reveal, self.sequence_fps,
         )
 
     def to_persistable(self) -> dict:
@@ -83,6 +98,7 @@ class Settings:
             "out_dir": self.out_dir,
             "audio_bits": self.audio_bits,
             "auto_reveal": self.auto_reveal,
+            "sequence_fps": self.sequence_fps,
         }
 
 
@@ -112,6 +128,14 @@ def load_persisted_settings() -> Settings:
 
     auto_reveal = bool(data.get("auto_reveal", False))
 
+    raw_fps = data.get("sequence_fps", 24.0)
+    try:
+        sequence_fps = float(raw_fps)
+    except (TypeError, ValueError):
+        sequence_fps = 24.0
+    if not (0 < sequence_fps <= 240):
+        sequence_fps = 24.0
+
     return Settings(
         profile=profile,
         alpha=False,
@@ -119,6 +143,7 @@ def load_persisted_settings() -> Settings:
         out_dir=out_dir,
         audio_bits=audio_bits,
         auto_reveal=auto_reveal,
+        sequence_fps=sequence_fps,
     )
 
 
@@ -140,6 +165,7 @@ class SettingsPane(Gtk.Box):
         self._encoder_kind = encoder_kind
         self._encoding_locked = False
         self._first_file_name: Optional[str] = None
+        self._first_file_sequence: Optional[SequenceSpec] = None
         self._profile_buttons: dict[str, Gtk.ToggleButton] = {}
         self._profile_rows: dict[str, Gtk.Widget] = {}
         self._profile_radios: dict[str, Gtk.Widget] = {}
@@ -167,11 +193,20 @@ class SettingsPane(Gtk.Box):
             self._audio_bits_switch.set_sensitive(not encoding)
         if hasattr(self, "_auto_reveal_switch"):
             self._auto_reveal_switch.set_sensitive(not encoding)
+        if hasattr(self, "_seq_fps_spin"):
+            self._seq_fps_spin.set_sensitive(not encoding)
+        if hasattr(self, "_seq_fps_dropdown"):
+            self._seq_fps_dropdown.set_sensitive(not encoding)
         self._naming_dropdown.set_sensitive(not encoding)
         self._browse_btn.set_sensitive(not encoding)
 
-    def set_first_file_name(self, name: Optional[str]) -> None:
+    def set_first_file_name(
+        self,
+        name: Optional[str],
+        sequence: Optional[SequenceSpec] = None,
+    ) -> None:
         self._first_file_name = name
+        self._first_file_sequence = sequence
         self._update_cmd_preview()
 
     def refresh(self) -> None:
@@ -196,6 +231,12 @@ class SettingsPane(Gtk.Box):
             if self._naming_handler_id:
                 self._naming_dropdown.handler_unblock(self._naming_handler_id)
         self._folder_path.set_text(self._settings.out_dir)
+        if hasattr(self, "_seq_fps_spin"):
+            self._seq_fps_spin.handler_block(self._seq_fps_spin_handler)
+            try:
+                self._seq_fps_spin.set_value(self._settings.sequence_fps)
+            finally:
+                self._seq_fps_spin.handler_unblock(self._seq_fps_spin_handler)
         self._update_cmd_preview()
 
     # ---------- header ----------
@@ -237,6 +278,7 @@ class SettingsPane(Gtk.Box):
         body.append(self._build_profile_section())
         body.append(self._build_alpha_section())
         body.append(self._build_audio_bits_section())
+        body.append(self._build_sequence_fps_section())
         body.append(self._build_auto_reveal_section())
         body.append(self._build_naming_section())
         body.append(self._build_folder_section())
@@ -435,6 +477,87 @@ class SettingsPane(Gtk.Box):
         self.emit("settings-changed")
         return False
 
+    # ---------- sequence frame rate ----------
+
+    # Common cinema / broadcast / streaming frame rates. The spin button lets
+    # the user enter anything in (0, 240], but most users pick one of these.
+    _SEQ_FPS_PRESETS: tuple[float, ...] = (
+        23.976, 24.0, 25.0, 29.97, 30.0, 48.0, 50.0, 59.94, 60.0,
+    )
+
+    def _build_sequence_fps_section(self) -> Gtk.Widget:
+        section = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        label = Gtk.Label(label="Sequence frame rate", xalign=0)
+        label.add_css_class("section-label")
+        section.append(label)
+        sub = Gtk.Label(xalign=0)
+        sub.add_css_class("section-sublabel")
+        sub.set_wrap(True)
+        sub.set_max_width_chars(50)
+        sub.set_label(
+            "Applied to every image-sequence job. Pick a preset or enter a "
+            "custom rate (1–240 fps)."
+        )
+        section.append(sub)
+
+        row = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=8)
+
+        spin = Gtk.SpinButton.new_with_range(1.0, 240.0, 1.0)
+        spin.set_digits(3)
+        spin.set_climb_rate(1.0)
+        spin.set_value(self._settings.sequence_fps)
+        spin.set_hexpand(True)
+        self._seq_fps_spin = spin
+        self._seq_fps_spin_handler = spin.connect("value-changed", self._on_seq_fps_changed)
+        row.append(spin)
+
+        labels = [_fmt_fps_preset(v) for v in self._SEQ_FPS_PRESETS]
+        model = Gtk.StringList.new(labels)
+        dropdown = Gtk.DropDown.new(model, None)
+        dropdown.add_css_class("nocoder-select")
+        # Default the dropdown to "no preset highlighted" by selecting the
+        # closest match if one exists, else leaving it at index 0.
+        try:
+            preset_idx = self._SEQ_FPS_PRESETS.index(
+                min(self._SEQ_FPS_PRESETS, key=lambda v: abs(v - self._settings.sequence_fps))
+            )
+        except ValueError:
+            preset_idx = 1  # 24.0
+        dropdown.set_selected(preset_idx)
+        self._seq_fps_dropdown = dropdown
+        self._seq_fps_dropdown_handler = dropdown.connect(
+            "notify::selected", self._on_seq_fps_preset_changed,
+        )
+        row.append(dropdown)
+
+        section.append(row)
+        return section
+
+    def _on_seq_fps_changed(self, spin: Gtk.SpinButton) -> None:
+        new = float(spin.get_value())
+        if abs(new - self._settings.sequence_fps) < 1e-4:
+            return
+        self._settings.sequence_fps = new
+        self._update_cmd_preview()
+        self.emit("settings-changed")
+
+    def _on_seq_fps_preset_changed(self, dropdown: Gtk.DropDown, _pspec) -> None:
+        idx = dropdown.get_selected()
+        if not (0 <= idx < len(self._SEQ_FPS_PRESETS)):
+            return
+        new = self._SEQ_FPS_PRESETS[idx]
+        if abs(new - self._settings.sequence_fps) < 1e-4:
+            return
+        self._settings.sequence_fps = new
+        # Sync the spin button without retriggering settings-changed twice.
+        self._seq_fps_spin.handler_block(self._seq_fps_spin_handler)
+        try:
+            self._seq_fps_spin.set_value(new)
+        finally:
+            self._seq_fps_spin.handler_unblock(self._seq_fps_spin_handler)
+        self._update_cmd_preview()
+        self.emit("settings-changed")
+
     # ---------- auto-reveal toggle ----------
 
     def _build_auto_reveal_section(self) -> Gtk.Widget:
@@ -599,7 +722,30 @@ class SettingsPane(Gtk.Box):
     def _update_cmd_preview(self) -> None:
         if not hasattr(self, "_buffer"):
             return
-        if self._first_file_name:
+        if self._first_file_sequence is not None:
+            spec = self._first_file_sequence
+            # Reflect the spin button's current value in the preview, even if
+            # the FileEntry's spec was built with a different fps — the
+            # preview is forward-looking.
+            preview_spec = SequenceSpec(
+                dir=spec.dir,
+                prefix=spec.prefix,
+                ext=spec.ext,
+                padding=spec.padding,
+                start_frame=spec.start_frame,
+                frame_count=spec.frame_count,
+                expected_frames=spec.expected_frames,
+                fps=self._settings.sequence_fps,
+            )
+            suffix = f"_prores_{self._settings.profile}" if self._settings.naming == "suffix" else ""
+            out_path = f"{self._settings.out_dir.rstrip('/')}/{preview_spec.stripped_stem}{suffix}.mov"
+            text = format_preview_command(
+                preview_spec.first_frame_path, out_path,
+                self._settings.profile, self._settings.alpha,
+                audio_bits=self._settings.audio_bits,
+                sequence=preview_spec,
+            )
+        elif self._first_file_name:
             stem = Path(self._first_file_name).stem
             suffix = f"_prores_{self._settings.profile}" if self._settings.naming == "suffix" else ""
             out_path = f"{self._settings.out_dir.rstrip('/')}/{stem}{suffix}.mov"

nocoder/window.py

@@ -33,11 +33,14 @@ from .data import (
 )
 from .encoder import (
     EncodeJob,
+    SequenceSpec,
     detect_prores_encoder,
     plan_output_path,
     probe_metadata,
+    probe_sequence_metadata,
     run_encode,
 )
+from .sequence_scan import scan_folder, sum_frame_sizes
 from .footer import Footer
 from .queue_pane import FileEntry, QueuePane
 from .config import load_config, update_config
@@ -92,6 +95,10 @@ class MainWindow(Adw.ApplicationWindow):
         self._queue = QueuePane()
         self._queue.connect("add-files-requested", lambda *_: self._open_files_dialog())
         self._queue.connect("add-folder-requested", lambda *_: self._open_folder_dialog())
+        self._queue.connect(
+            "add-sequence-folder-requested",
+            lambda *_: self._open_sequence_folder_dialog(),
+        )
         self._queue.connect("clear-requested", lambda *_: self._clear_files())
         self._queue.connect("files-dropped", self._on_files_dropped)
         self._queue.connect("selection-changed", self._on_selection_changed)
@@ -251,8 +258,13 @@ class MainWindow(Adw.ApplicationWindow):
         if self._selected_id is not None:
             self._queue.set_selected(self._selected_id)
         self._queue.set_encoding(self._state == "encoding")
-        first_name = self._files[0].name if self._files else None
+        first = self._files[0] if self._files else None
-        self._settings_pane.set_first_file_name(first_name)
+        if first is not None:
+            self._settings_pane.set_first_file_name(
+                first.display_name, sequence=first.sequence,
+            )
+        else:
+            self._settings_pane.set_first_file_name(None)
         self._settings_pane.set_encoding(self._state == "encoding")
         self._settings_pane.refresh()
         self._footer.update(
@@ -367,6 +379,32 @@ class MainWindow(Adw.ApplicationWindow):
         paths.sort()
         self._add_paths(paths)
 
+    def _open_sequence_folder_dialog(self) -> None:
+        dialog = Gtk.FileDialog()
+        dialog.set_title("Choose image-sequence folder")
+        dialog.set_modal(True)
+        dialog.select_folder(self, None, self._on_sequence_folder_chosen)
+
+    def _on_sequence_folder_chosen(self, dialog: Gtk.FileDialog, result) -> None:
+        try:
+            f = dialog.select_folder_finish(result)
+        except GLib.Error:
+            return
+        if f is None:
+            return
+        path = f.get_path()
+        if not path:
+            return
+        specs = scan_folder(path, self._settings.sequence_fps)
+        if not specs:
+            self._show_error(
+                f"No image sequences found in:\n{path}\n\n"
+                "Sequences are groups of ≥2 frames sharing a name prefix and "
+                "extension, ending in a digit run (e.g. shot_0001.png …)."
+            )
+            return
+        self._add_sequences(specs)
+
     def _open_out_dir_dialog(self) -> None:
         dialog = Gtk.FileDialog()
         dialog.set_title("Choose output folder")
@@ -436,6 +474,73 @@ class MainWindow(Adw.ApplicationWindow):
         for entry in added:
             self._probe_async(entry, mbps)
 
+    def _add_sequences(self, specs: list[SequenceSpec]) -> None:
+        # Dedupe by (dir + pattern_basename) so re-adding the same folder
+        # doesn't queue the same sequence twice. Realpath dedupe is wrong
+        # here because two sequences in the same folder share the parent
+        # path — the pattern is what makes them distinct.
+        existing = {
+            (f.sequence.dir, f.sequence.pattern_basename)
+            for f in self._files
+            if f.sequence is not None
+        }
+        mbps = PROFILES_BY_ID[self._settings.profile].mbps
+        added: list[FileEntry] = []
+        for spec in specs:
+            key = (spec.dir, spec.pattern_basename)
+            if key in existing:
+                continue
+            first = spec.first_frame_path
+            try:
+                size = sum_frame_sizes(spec)
+            except OSError:
+                size = 0
+            entry = FileEntry(path=first, size=size, sequence=spec)
+            entry.est_out = 0.0
+            self._files.append(entry)
+            existing.add(key)
+            added.append(entry)
+        if not added:
+            return
+        if self._state == "complete":
+            self._state = "ready"
+            self._reset_file_statuses()
+        self._refresh_all()
+        for entry in added:
+            self._probe_sequence_async(entry, mbps)
+
+    def _probe_sequence_async(self, entry: FileEntry, mbps: int) -> None:
+        spec = entry.sequence
+        assert spec is not None
+
+        def worker() -> None:
+            meta = probe_sequence_metadata(spec)
+
+            def apply() -> bool:
+                entry.meta = meta
+                entry.est_out = estimate_output_bytes(meta.duration, mbps)
+                self._queue.update_file(entry)
+                self._footer.update(
+                    state="ready" if self._state in ("empty", "ready") else self._state,
+                    files=self._files,
+                    profile_id=self._settings.profile,
+                    overall=self._overall_progress(),
+                    current_idx=self._current_idx,
+                )
+                first = self._files[0] if self._files else None
+                if first is not None:
+                    self._settings_pane.set_first_file_name(
+                        first.display_name, sequence=first.sequence,
+                    )
+                else:
+                    self._settings_pane.set_first_file_name(None)
+                return False
+
+            GLib.idle_add(apply)
+
+        t = threading.Thread(target=worker, daemon=True)
+        t.start()
+
     def _probe_async(self, entry: FileEntry, mbps: int) -> None:
         def worker() -> None:
             meta = probe_metadata(entry.path)
@@ -450,7 +555,13 @@ class MainWindow(Adw.ApplicationWindow):
                     overall=self._overall_progress(),
                     current_idx=self._current_idx,
                 )
-                self._settings_pane.set_first_file_name(self._files[0].name if self._files else None)
+                first = self._files[0] if self._files else None
+                if first is not None:
+                    self._settings_pane.set_first_file_name(
+                        first.display_name, sequence=first.sequence,
+                    )
+                else:
+                    self._settings_pane.set_first_file_name(None)
                 return False
             GLib.idle_add(apply)
         t = threading.Thread(target=worker, daemon=True)
@@ -541,11 +652,15 @@ class MainWindow(Adw.ApplicationWindow):
                 GLib.idle_add(self._finish_file, entry.id, False, "source file is missing")
                 continue
             GLib.idle_add(self._set_current_encoding, idx, entry.id)
+            stem_override = (
+                entry.sequence.stripped_stem if entry.sequence is not None else None
+            )
             out_path = plan_output_path(
                 entry.path,
                 self._settings.out_dir,
                 self._settings.naming,
                 self._settings.profile,
+                stem_override=stem_override,
             )
             done_event = threading.Event()
             result = {"ok": False, "err": None}
@@ -569,6 +684,7 @@ class MainWindow(Adw.ApplicationWindow):
                 on_done=on_done,
                 on_speed=on_speed,
                 audio_stream_indexes=list(entry.meta.audio_stream_indexes),
+                sequence=entry.sequence,
                 cancel_event=cancel,
             )
             # Track the active job so _on_close_request can cancel the live