fix(downloads): GIF review round 1 — shape, HDR, caps, audio, copy

- A GIF squares its pixels before the size, so an anamorphic source keeps
  its shown shape (a 720x480 DVD at 16:9 was 480x320).
- An editor GIF of an HDR upload is tonemapped, as a clip GIF is.
- The length caps are judged in whole milliseconds: a range exactly at a
  cap is no longer refused for a float hair over it.
- A GIF is made of a video only: an audio file is refused with its reason
  and the editor offers no GIF for it.
- A GIF clip keeps no audio track: the track neither splits its cache key
  nor fails it.
- The editor's GIF notes keep their live region mounted; one size reads
  as one ("about 1 MB"), none is shown with nothing kept; the size choices
  show their unit; a shared picture that fails to load says so.
- Copy: the two-sentence GIF notes keep their last stop (a copy-rule test
  now holds it); the English warns of "only a still picture".

backend/app/downloads/clip.py

@@ -110,7 +110,10 @@ def normalize(
     if not (math.isfinite(start_s) and math.isfinite(end_s)) or start_s < 0:
         raise ClipError("bad_range")
     start, end = round(start_s, 3), round(end_s, 3)
-    if end - start < MIN_CLIP_S:
+    # Judged in whole milliseconds, as the ends are kept: a float difference lands a hair off
+    # (60.529 - 30.529 = 30.000000000000004), which would refuse a range exactly at a cap.
+    span_ms = round((end - start) * 1000)
+    if span_ms < MIN_CLIP_S * 1000:
         raise ClipError("too_short")
     side = None
     if gif_side is not None:
@@ -118,15 +121,16 @@ def normalize(
             side = gifmod.normalize_side(gif_side)
         except ValueError as e:
             raise ClipError("bad_gif") from e
-    if side is not None and end - start > gifmod.MAX_S:
+    if side is not None and gifmod.too_long(start, end):
         # Its own reason: a GIF's cap is said in seconds, a clip's in minutes.
         raise ClipError("gif_too_long", limit_s=gifmod.MAX_S)
-    if end - start > MAX_CLIP_S:
+    if span_ms > MAX_CLIP_S * 1000:
         raise ClipError("too_long", limit_s=MAX_CLIP_S)
     spec: dict = {"source": source, "ref": ref, "start_s": start, "end_s": end}
     if side is not None:
         spec["gif"] = {"side": side}
-    if source == "plex" and audio_track is not None:
+    # A GIF has no sound: the track the player was on is not part of what it is (its cache key).
+    if source == "plex" and audio_track is not None and side is None:
         if not 0 <= audio_track <= _MAX_AUDIO_TRACK:
             raise ClipError("bad_audio")
         spec["audio_track"] = audio_track

backend/app/downloads/gif.py

@@ -39,6 +39,19 @@ def normalize_side(side: object) -> int:
     return side
 
 
+def too_long(start_s: float, end_s: float) -> bool:
+    """Over `MAX_S`, counted in whole milliseconds: the ends are kept to the millisecond, and their
+    float difference may land a hair over (60.529 - 30.529 = 30.000000000000004), which would refuse
+    the very 30 s the panels allow."""
+    return round((end_s - start_s) * 1000) > MAX_S * 1000
+
+
+# A GIF has no pixel shape a viewer honours (browsers ignore its aspect byte), so a source stored
+# with wide or narrow pixels (an anamorphic DVD: 720x480 shown at 16:9) is first resampled to square
+# ones, or it shows squeezed. `sar` is 1 for a source that names none; even, as a 4:2:0 frame wants.
+_SQUARE_PIXELS = "scale=w='trunc(iw*sar/2)*2':h=ih,setsar=1"
+
+
 def _scale(side: int) -> str:
     """Fit the long side into `side`, never upscaling a smaller picture; the short side keeps the
     aspect (-1: a GIF has no chroma grid that wants it even)."""
@@ -50,8 +63,10 @@ def _scale(side: int) -> str:
 
 def filter_graph(pre: str, side: int) -> str:
     """The GIF's filters: `pre` (a crop, an HDR tonemap) on the source's own frame first, then the
-    frame rate and the size, then a palette made from these frames and applied to them."""
-    head = ",".join([*([pre] if pre else []), f"fps={FPS}", _scale(side)])
+    frame rate, square pixels and the size, then a palette made from these frames and applied to them.
+    A crop counts the stored frame (both callers' crops are fractions of `iw`/`ih`), so it comes
+    before the pixels are squared."""
+    head = ",".join([*([pre] if pre else []), f"fps={FPS}", _SQUARE_PIXELS, _scale(side)])
     return (
         f"[0:v:0]{head},split[a][b];"
         "[a]palettegen=stats_mode=diff[p];"

backend/app/downloads/pipeline.py

@@ -888,15 +888,21 @@ def _process_edit(job_id: int, asset_id: int) -> None:
 
         _set_job(job_id, phase="editing", progress=0, speed_bps=None, eta_s=None)
         if gif:
-            # One range with an end (the service's check), cropped first if a frame was drawn.
+            # One range with an end (the service's check), cropped first if a frame was drawn, then
+            # tonemapped as a clip GIF is: an HDR upload keeps its HLG/PQ tags, and a GIF has none,
+            # so a palette made from those frames would be washed out.
             trim = edit_spec["trim"]
             start = trim.get("start_s") or 0.0
+            data = probe.probe_json(src_path)
             cmd = gifmod.build_cmd(
                 src_path,
                 dest_staging,
                 start,
                 trim["end_s"] - start,
-                pre=editmod.crop_filter(edit_spec["crop"]) if crop else "",
+                pre=clipmod.gif_pre(
+                    editmod.crop_filter(edit_spec["crop"]) if crop else "",
+                    bool(data) and clipmod.is_hdr(data),
+                ),
                 side=gif["side"],
             )
         elif edit_spec.get("segments"):
@@ -1115,14 +1121,17 @@ def _process_clip(job_id: int, asset_id: int) -> None:
             raise StatedFailure("The source file could not be read.")
         audio_track = spec.get("audio_track")
         tracks = clipmod.audio_track_count(data)
-        if tracks == 0:
+        gif = spec.get("gif")
+        if gif:
+            # A GIF has no sound: no track is chosen, so none can be missing.
+            audio_track = None
+        elif tracks == 0:
             # A silent source: the player still names its track 0, and the clip is silent too.
             audio_track = None
         elif audio_track is not None and audio_track >= tracks:
             raise StatedFailure("The chosen audio track is not in the file.")
         crop = _clip_crop(spec, data)
         total_s = clipmod.duration(spec)
-        gif = spec.get("gif")
         hdr = clipmod.is_hdr(data)
         out = staging / ("clip.gif" if gif else "clip.mp4")
         _set_job(job_id, phase="editing", progress=0, speed_bps=None, eta_s=None)

backend/app/downloads/service.py

@@ -44,7 +44,13 @@ from app.userscope import owned_by, owned_row
 # Every reason an edit is refused; the UI names each one (`downloads.errors.edit.<reason>`, held by
 # the frontend's backendIds contract, which reads this Literal).
 EditReason = Literal[
-    "source_not_ready", "not_media", "empty_edit", "bad_gif", "gif_range", "gif_too_long"
+    "source_not_ready",
+    "not_media",
+    "empty_edit",
+    "bad_gif",
+    "gif_range",
+    "gif_too_long",
+    "gif_not_video",
 ]
 
 
@@ -268,7 +274,7 @@ def _check_gif_edit(spec: dict) -> None:
     trim = spec.get("trim") or {}
     if spec.get("segments") or trim.get("end_s") is None:
         raise EditError("gif_range")
-    if trim["end_s"] - trim.get("start_s", 0.0) > gifmod.MAX_S:
+    if gifmod.too_long(trim.get("start_s", 0.0), trim["end_s"]):
         raise EditError("gif_too_long", limit_s=gifmod.MAX_S)
 
 
@@ -298,6 +304,9 @@ def enqueue_edit(
     if not spec:
         raise EditError("empty_edit")
     if "gif" in (edit_spec or {}):
+        # A GIF is made of the first video stream: audio has none, or only its cover picture.
+        if src_asset.media_kind != mediakind.VIDEO:
+            raise EditError("gif_not_video")
         _check_gif_edit(spec)
 
     quota.check_enqueue(db, user_id)

backend/tests/test_clip.py

@@ -740,6 +740,30 @@ def test_the_thirty_second_gif_cap_itself_is_allowed():
     assert clipmod.duration(clipmod.normalize("plex", "42", 0, 30, gif_side=480)) == 30
 
 
+@pytest.mark.parametrize(
+    ("start", "end", "kw"),
+    [
+        # Each a range exactly at a cap whose float difference lands a hair past it.
+        (30.529, 60.529, {"gif_side": 480}),
+        (424.005, 1024.005, {}),
+        (0.001, 1.001, {}),
+    ],
+)
+def test_a_range_exactly_at_a_cap_is_judged_in_milliseconds(start, end, kw):
+    assert end - start not in (1, 30, 600)  # the float difference is off the cap itself
+    assert round((end - start) * 1000) in (1000, 30000, 600000)
+    clipmod.normalize("youtube", "abcdefghijk", start, end, **kw)
+
+
+def test_a_gif_clip_keeps_no_audio_track_so_the_track_does_not_make_another_gif():
+    first = clipmod.normalize("plex", "42", 10, 20, audio_track=0, gif_side=480)
+    other = clipmod.normalize("plex", "42", 10, 20, audio_track=1, gif_side=480)
+    assert "audio_track" not in first
+    assert clipmod.sig(first) == clipmod.sig(other)
+    # A video clip keeps the track it was heard on.
+    assert clipmod.normalize("plex", "42", 10, 20, audio_track=1)["audio_track"] == 1
+
+
 def test_a_gif_clip_is_queued_as_a_file_and_too_long_says_its_own_cap(
     db, make_user, as_user, yt_video
 ):
@@ -810,6 +834,19 @@ def test_a_gif_clip_is_cut_through_the_gif_command_and_stored_as_an_image_file(
     assert cmd[cmd.index("-t") + 1] == "15.000"
 
 
+def test_a_gif_clip_is_never_refused_for_an_audio_track(
+    db, make_user, as_user, plex_episode, gif_worker
+):
+    # A GIF queued with a track (as one made before GIFs dropped it was): the file has one track,
+    # the spec names a fourth, and a GIF, which has no sound, is made all the same.
+    job = _clip(as_user(make_user()), source="plex", ref="777", gif_side=480, end_s=25).json()
+    row = db.get(DownloadJob, job["id"])
+    row.edit_spec = {**row.edit_spec, "audio_track": 3}
+    db.commit()
+    job, asset = gif_worker["run"](job)
+    assert (job.status, asset.status) == ("done", "ready")
+
+
 def test_a_gif_over_its_size_cap_is_not_kept_and_says_why(
     db, make_user, as_user, plex_episode, gif_worker, monkeypatch
 ):

backend/tests/test_edit_gif.py

@@ -3,12 +3,15 @@ to the GIF's limits at enqueue, and made by the worker with real ffmpeg."""
 
 import shutil
 import subprocess
+from pathlib import Path
 
 import pytest
 
 from app.config import settings
+from app.downloads import clip as clipmod
 from app.downloads import edit as editmod
 from app.downloads import pipeline, service
+from app.downloads import probe as probemod
 from app.downloads import gif as gifmod
 from app.downloads import upload as uploadmod
 from app.downloads.models import DownloadJob, MediaAsset
@@ -63,6 +66,84 @@ def test_a_gif_edit_it_cannot_make_is_refused_with_its_reason(
     assert e.value.reason == reason
 
 
+@needs_ffmpeg
+def test_a_gif_edit_of_exactly_thirty_seconds_is_allowed(db, make_user, tmp_path, monkeypatch):
+    monkeypatch.setattr(settings, "files_root", str(tmp_path / "root"))
+    u = make_user()
+    source = _source(db, u, tmp_path)
+    # Ends kept to the millisecond whose float difference lands a hair over 30 s.
+    assert 32.02 - 2.02 > gifmod.MAX_S
+    job = service.enqueue_edit(
+        db, u.id, source, {"trim": {"start_s": 2.02, "end_s": 32.02}, "gif": {"side": 480}}
+    )
+    assert job.edit_spec["gif"] == {"side": 480}
+
+
+@needs_ffmpeg
+def test_a_gif_is_made_of_a_video_never_of_audio(db, make_user, tmp_path, monkeypatch):
+    monkeypatch.setattr(settings, "files_root", str(tmp_path / "root"))
+    u = make_user()
+    src = tmp_path / "in.m4a"
+    subprocess.run(
+        [
+            "ffmpeg", "-y", "-loglevel", "error",
+            "-f", "lavfi", "-i", "sine=frequency=440:duration=10", "-c:a", "aac", str(src),
+        ],
+        check=True,
+    )  # fmt: skip
+    source = uploadmod.ingest_upload(
+        db, u.id, filename="in.m4a", src_path=src, size=src.stat().st_size
+    )
+    assert db.get(MediaAsset, source.asset_id).media_kind == "audio"
+    spec = {"trim": {"start_s": 1, "end_s": 5}}
+    with pytest.raises(service.EditError) as e:
+        service.enqueue_edit(db, u.id, source, {**spec, "gif": {"side": 480}})
+    assert e.value.reason == "gif_not_video"
+    # The same range as audio is an edit as it always was.
+    assert service.enqueue_edit(db, u.id, source, spec).edit_spec["trim"]["end_s"] == 5
+
+
+@needs_ffmpeg
+def test_an_hdr_source_is_tonemapped_before_its_gif_palette(db, make_user, tmp_path, monkeypatch):
+    monkeypatch.setattr(settings, "files_root", str(tmp_path / "root"))
+    u = make_user()
+    src = tmp_path / "hlg.mp4"
+    subprocess.run(
+        [
+            "ffmpeg", "-y", "-loglevel", "error",
+            "-f", "lavfi", "-i", "testsrc2=size=640x360:rate=10:duration=4",
+            "-vf", "setparams=color_trc=arib-std-b67:color_primaries=bt2020:colorspace=bt2020nc",
+            "-c:v", "libx264", "-pix_fmt", "yuv420p", str(src),
+        ],
+        check=True,
+    )  # fmt: skip
+    source = uploadmod.ingest_upload(
+        db, u.id, filename="hlg.mp4", src_path=src, size=src.stat().st_size
+    )
+    # The upload keeps its HLG tag, as an HDR phone video's does.
+    placed = Path(settings.files_root) / db.get(MediaAsset, source.asset_id).rel_path
+    assert clipmod.is_hdr(probemod.probe_json(placed) or {})
+    job = service.enqueue_edit(
+        db, u.id, source, {"trim": {"start_s": 1, "end_s": 3}, "gif": {"side": 320}}
+    )
+    asset = db.get(MediaAsset, job.asset_id)
+    job.status, asset.status = "running", "downloading"
+    db.commit()
+    seen: dict = {}
+    build = gifmod.build_cmd
+
+    def spy(*a, **k):
+        seen["pre"] = k["pre"]
+        return build(*a, **k)
+
+    monkeypatch.setattr(pipeline.gifmod, "build_cmd", spy)
+    pipeline._process_edit(job.id, asset.id)
+
+    assert "tonemap" in seen["pre"]
+    db.expire_all()
+    assert db.get(DownloadJob, job.id).status == "done"
+
+
 @needs_ffmpeg
 def test_a_gif_edit_is_made_by_the_worker_and_kept_as_an_image_file(
     db, make_user, tmp_path, monkeypatch

backend/tests/test_gif.py

@@ -66,11 +66,25 @@ def test_a_crop_or_a_tonemap_comes_before_the_scale_and_the_palette():
     assert graph.index("crop=100:100:0:0") < graph.index("scale=") < graph.index("palettegen")
 
 
-def _video(path: Path, size: str, seconds: int = 2) -> Path:
+def test_the_length_cap_counts_whole_milliseconds():
+    # Two ends kept to the millisecond whose float difference lands a hair over 30 s.
+    assert 60.529 - 30.529 > gifmod.MAX_S
+    assert not gifmod.too_long(30.529, 60.529)
+    assert not gifmod.too_long(0, 30)
+    assert gifmod.too_long(0, 30.001)
+
+
+def test_the_pixels_are_squared_after_the_crop_and_before_the_size():
+    graph = gifmod.filter_graph("crop=100:100:0:0", 480)
+    assert graph.index("crop=") < graph.index("setsar=1") < graph.index("flags=lanczos")
+
+
+def _video(path: Path, size: str, seconds: int = 2, sar: str = "1") -> Path:
     subprocess.run(
         [
             "ffmpeg", "-y", "-loglevel", "error",
             "-f", "lavfi", "-i", f"testsrc2=size={size}:rate=25:duration={seconds}",
+            "-vf", f"setsar={sar}",
             "-c:v", "libx264", "-pix_fmt", "yuv420p", str(path),
         ],
         check=True,
@@ -78,6 +92,24 @@ def _video(path: Path, size: str, seconds: int = 2) -> Path:
     return path
 
 
+@needs_ffmpeg
+@pytest.mark.parametrize(
+    ("size", "sar", "expected"),
+    [
+        # A DVD stored 720x480 and shown at 16:9: a GIF shows its stored pixels as they are, so
+        # they are squared first, or the picture comes out 480x320 (3:2), squeezed.
+        ("720x480", "32/27", (480, 270)),
+        # HDV: 1440x1080 shown at 16:9.
+        ("1440x1080", "4/3", (480, 270)),
+    ],
+)
+def test_a_source_with_wide_pixels_keeps_its_shown_shape(tmp_path, size, sar, expected):
+    src = _video(tmp_path / "in.mp4", size, sar=sar)
+    out = tmp_path / "out.gif"
+    subprocess.run(gifmod.build_cmd(src, out, 0.0, 1.0, pre="", side=480), check=True)
+    assert gifmod.size(out) == expected
+
+
 @needs_ffmpeg
 @pytest.mark.parametrize(
     ("size", "side", "expected"),

frontend/src/features/player/ClipPanel.dom.test.tsx

@@ -14,7 +14,11 @@ vi.mock("react-i18next", async (importOriginal) => {
   const actual = await importOriginal<typeof import("react-i18next")>();
   return {
     ...actual,
-    useTranslation: () => ({ t: (k: string) => k, i18n: { language: "en" } }),
+    // A size option reads as its own words with its unit ("480 px"); every other text is its key.
+    useTranslation: () => ({
+      t: (k: string, o?: { n?: string }) => (k === "clip.gif.side" ? `${o?.n} px` : k),
+      i18n: { language: "en" },
+    }),
   };
 });
 
@@ -281,7 +285,7 @@ describe("ClipPanel GIF", () => {
     render(<Harness onClose={onClose} start={{ start: 100, end: 108 }} />);
     expect(screen.queryByRole("group", { name: "clip.gif.size" })).toBeNull();
     fireEvent.click(screen.getByRole("button", { name: "clip.formatGif" }));
-    fireEvent.click(screen.getByRole("button", { name: "320" }));
+    fireEvent.click(screen.getByRole("button", { name: "320 px" }));
     expect(enqueueClip).not.toHaveBeenCalled();
     fireEvent.click(screen.getByRole("button", { name: "clip.gif.make" }));
     await waitFor(() => expect(onClose).toHaveBeenCalled());
@@ -298,7 +302,9 @@ describe("ClipPanel GIF", () => {
   it("starts at the default size, and a video again sends no GIF", async () => {
     render(<Harness start={{ start: 100, end: 108 }} />);
     fireEvent.click(screen.getByRole("button", { name: "clip.formatGif" }));
-    expect(screen.getByRole("button", { name: "480" }).getAttribute("aria-pressed")).toBe("true");
+    expect(screen.getByRole("button", { name: "480 px" }).getAttribute("aria-pressed")).toBe(
+      "true",
+    );
     fireEvent.click(screen.getByRole("button", { name: "clip.formatVideo" }));
     fireEvent.click(screen.getByRole("button", { name: "clip.cut" }));
     await waitFor(() => expect(enqueueClip).toHaveBeenCalled());
@@ -333,7 +339,21 @@ describe("ClipPanel GIF", () => {
     expect(range()).toBe("100-120");
     expect(note()).toBe("clip.gif.noPreview");
     // 20 s at 640: up to about 32 MB, past the server's 30.
-    fireEvent.click(screen.getByRole("button", { name: "640" }));
+    fireEvent.click(screen.getByRole("button", { name: "640 px" }));
     expect(note()).toBe("clip.gif.mayFail");
   });
+
+  it("says one size, not a range of one, when both ends read the same", () => {
+    // 1 s at 480: 0.4–1.0 MB, both shown as 1.
+    render(<Harness start={{ start: 100, end: 101 }} />);
+    fireEvent.click(screen.getByRole("button", { name: "clip.formatGif" }));
+    expect(screen.getByText("clip.gif.estimateOne")).toBeTruthy();
+    expect(screen.queryByText("clip.gif.estimate")).toBeNull();
+    // 10 s: a range.
+    fireEvent.change(screen.getByRole("textbox", { name: "clip.out" }), {
+      target: { value: "1:50" },
+    });
+    fireEvent.keyDown(screen.getByRole("textbox", { name: "clip.out" }), { key: "Enter" });
+    expect(screen.getByText("clip.gif.estimate")).toBeTruthy();
+  });
 });

frontend/src/features/player/ClipPanel.tsx

@@ -10,6 +10,7 @@ import { notifyActionError } from "../../lib/actionErrors";
 import { showInTray } from "../../lib/downloadQueue";
 import { log } from "../../lib/log";
 import { formatTimecode } from "../../lib/timecode";
+import { formatNumber } from "../../lib/format";
 import {
   estimateGif,
   gifEstimateText,
@@ -146,6 +147,7 @@ export default function ClipPanel({
   const shape = crop ? (crop.rect.w * picture) / crop.rect.h : picture;
   const estimate = estimateGif(length, side, shape);
   const verdict = gif ? gifVerdict(length, estimate) : "ok";
+  const estimateText = gifEstimateText(estimate, i18n.language);
   const blocked = verdict === "too_long";
 
   // Opened from a button or a key, the panel takes the focus to its In handle: the button that
@@ -421,10 +423,13 @@ export default function ClipPanel({
               ariaLabel={t("clip.gif.size")}
               value={String(side)}
               onChange={(v) => setSide(Number(v) as GifSide)}
-              options={GIF_SIDES.map((s) => ({ value: String(s), label: String(s) }))}
+              options={GIF_SIDES.map((s) => ({
+                value: String(s),
+                label: t("clip.gif.side", { n: formatNumber(s, i18n.language) }),
+              }))}
             />
             <span className="tabular-nums text-muted" aria-live="polite">
-              {t("clip.gif.estimate", gifEstimateText(estimate, i18n.language))}
+              {t(estimateText.single ? "clip.gif.estimateOne" : "clip.gif.estimate", estimateText)}
             </span>
           </>
         )}

frontend/src/i18n/copyRule.test.ts

@@ -39,6 +39,13 @@ describe("the copy rule", () => {
     expect(offenders((v) => v.includes("✓"))).toEqual([]);
   });
 
+  it("keeps the stops of a message of two sentences, the last one too", () => {
+    // A sentence break: a stop, a space, then a capital ("kb. {{n}}" is an abbreviation, not one). A
+    // value ending in a space is the head of a sentence a link or a number completes on screen.
+    const twoSentences = (v: string) => /[.!?] \p{Lu}/u.test(v) && !v.endsWith(" ");
+    expect(offenders((v) => twoSentences(v) && !/[.!?…]["”)]?$/u.test(v))).toEqual([]);
+  });
+
   it("spells no unit as a bare letter after a number ('90m', '24h', '{{count}}d', '10 s')", () => {
     expect(offenders((v) => /(\d|\}\})\s?(m|h|d|s)(?![\p{L}\d/])/u.test(v))).toEqual([]);
   });

frontend/src/i18n/locales/en/clip.json

@@ -28,11 +28,13 @@
   "gif": {
     "size": "GIF size, the longer side in pixels",
     "sizeLabel": "Size",
+    "side": "{{n}} px",
     "estimate": "about {{lo}}–{{hi}} MB",
+    "estimateOne": "about {{lo}} MB",
     "hint": "No sound, 12 frames a second",
-    "noPreview": "It may pass 15 MB, and then a Teams link preview shows it still. The downloaded file moves everywhere",
-    "mayFail": "It may pass 30 MB, and then it isn’t saved. A shorter range or a smaller size helps",
-    "tooLong": "A GIF is at most {{seconds}} seconds long. Shorten the range",
+    "noPreview": "It may pass 15 MB, and then a Teams link preview shows only a still picture. The downloaded file plays everywhere.",
+    "mayFail": "It may pass 30 MB, and then it isn’t saved. A shorter range or a smaller size helps.",
+    "tooLong": "A GIF is at most {{seconds}} seconds long. Shorten the range.",
     "make": "Make GIF",
     "queued": "The GIF is being made — it will be in your downloads",
     "failed": "Couldn’t make the GIF"

frontend/src/i18n/locales/en/downloads.json

@@ -227,6 +227,7 @@
       "bad_gif": "That GIF size isn’t available",
       "gif_range": "A GIF is made from one range with a start and an end",
       "gif_too_long": "A GIF is at most {{seconds}} seconds long",
+      "gif_not_video": "A GIF is made from a video",
       "generic": "Couldn't create that edit"
     },
     "upload": {

frontend/src/i18n/locales/en/editor.json

@@ -37,10 +37,11 @@
     "video": "Video",
     "gif": "GIF",
     "estimate": "about {{lo}}–{{hi}} MB in all",
+    "estimateOne": "about {{lo}} MB in all",
     "reencode": "A GIF is always re-encoded: no sound, 12 frames a second",
     "segTooLong": "Segment {{n}} is {{length}} long: a GIF is at most {{seconds}} seconds",
     "segMayFail": "Segment {{n}} may pass 30 MB as a GIF, and then it isn’t saved",
-    "segNoPreview": "Segment {{n}} may pass 15 MB as a GIF, and then a Teams link preview shows it still"
+    "segNoPreview": "Segment {{n}} may pass 15 MB as a GIF, and then a Teams link preview shows only a still picture"
   },
   "createGif_one": "Create {{count}} GIF",
   "createGif_other": "Create {{count}} GIFs",

frontend/src/i18n/locales/hu/clip.json

@@ -28,11 +28,13 @@
   "gif": {
     "size": "A GIF mérete, a hosszabbik oldal pixelben",
     "sizeLabel": "Méret",
+    "side": "{{n}} px",
     "estimate": "kb. {{lo}}–{{hi}} MB",
+    "estimateOne": "kb. {{lo}} MB",
     "hint": "Hang nélkül, 12 kép másodpercenként",
-    "noPreview": "15 MB fölé mehet, és akkor a Teams link-előnézetben állókép lesz. A letöltött fájl mindenhol mozog",
-    "mayFail": "30 MB fölé mehet, és akkor nem készül el. Rövidebb rész vagy kisebb méret segít",
-    "tooLong": "A GIF legfeljebb {{seconds}} másodperc lehet. Rövidítsd a kijelölést",
+    "noPreview": "15 MB fölé mehet, és akkor a Teams link-előnézetben állókép lesz. A letöltött fájl mindenhol mozog.",
+    "mayFail": "30 MB fölé mehet, és akkor nem készül el. Rövidebb rész vagy kisebb méret segít.",
+    "tooLong": "A GIF legfeljebb {{seconds}} másodperc lehet. Rövidítsd a kijelölést.",
     "make": "GIF készítése",
     "queued": "Készül a GIF — a letöltéseid közé kerül",
     "failed": "Nem sikerült elkészíteni a GIF-et"

frontend/src/i18n/locales/hu/downloads.json

@@ -227,6 +227,7 @@
       "bad_gif": "Ez a GIF-méret nem választható",
       "gif_range": "GIF egyetlen szakaszból készül, aminek eleje és vége is van",
       "gif_too_long": "A GIF legfeljebb {{seconds}} másodperc lehet",
+      "gif_not_video": "GIF csak videóból készülhet",
       "generic": "Nem sikerült létrehozni a vágást"
     },
     "upload": {

frontend/src/i18n/locales/hu/editor.json

@@ -37,6 +37,7 @@
     "video": "Videó",
     "gif": "GIF",
     "estimate": "összesen kb. {{lo}}–{{hi}} MB",
+    "estimateOne": "összesen kb. {{lo}} MB",
     "reencode": "A GIF mindig újrakódol: hang nélkül, 12 kép másodpercenként",
     "segTooLong": "{{n}}. szegmens: {{length}} hosszú, de a GIF legfeljebb {{seconds}} másodperc lehet",
     "segMayFail": "{{n}}. szegmens: GIF-ként 30 MB fölé mehet, és akkor nem készül el",

frontend/src/lib/gif.test.ts

@@ -33,6 +33,21 @@ describe("estimateGif", () => {
   });
 });
 
+describe("gifEstimateText", () => {
+  it("says whether both ends read the same, so a panel says one size", () => {
+    expect(gifEstimateText(estimateGif(1, 480, 16 / 9), "en")).toEqual({
+      lo: "1",
+      hi: "1",
+      single: true,
+    });
+    expect(gifEstimateText(estimateGif(10, 480, 16 / 9), "en")).toEqual({
+      lo: "4",
+      hi: "10",
+      single: false,
+    });
+  });
+});
+
 describe("gifVerdict", () => {
   it("refuses past the length cap, whatever the size", () => {
     expect(gifVerdict(30.2, { hi: 1 })).toBe("too_long");

frontend/src/lib/gif.ts

@@ -41,11 +41,12 @@ export function estimateGif(
 }
 
 /** An estimate's ends as whole megabytes in the reader's number format (at least 1, as a GIF of a
- *  second or two still takes one in the reader's eyes). */
+ *  second or two still takes one in the reader's eyes). `single` when both ends read the same: the
+ *  panels then say one number ("about 1 MB"), not a range of one ("about 1–1 MB"). */
 export function gifEstimateText(est: { lo: number; hi: number }, lang: string) {
   const lo = Math.max(1, Math.round(est.lo / MB));
   const hi = Math.max(lo, Math.round(est.hi / MB));
-  return { lo: formatNumber(lo, lang), hi: formatNumber(hi, lang) };
+  return { lo: formatNumber(lo, lang), hi: formatNumber(hi, lang), single: lo === hi };
 }
 
 /** What the panels say about a GIF before it is made: too long (refused, it does not start), it may

frontend/src/modules/files/VideoEditor.gif.dom.test.tsx

@@ -9,7 +9,11 @@ import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 
 vi.mock("react-i18next", async (importOriginal) => ({
   ...(await importOriginal<typeof import("react-i18next")>()),
-  useTranslation: () => ({ t: (key: string) => key, i18n: { language: "en" } }),
+  // A size option reads as its own words with its unit ("480 px"); every other text is its key.
+  useTranslation: () => ({
+    t: (key: string, o?: { n?: string }) => (key === "clip.gif.side" ? `${o?.n} px` : key),
+    i18n: { language: "en" },
+  }),
 }));
 const { notify } = vi.hoisted(() => ({ notify: vi.fn() }));
 vi.mock("../../lib/notifications", async (importOriginal) => ({
@@ -39,20 +43,20 @@ afterEach(() => {
   notify.mockReset();
 });
 
-const jobOf = (duration: number) =>
+const jobOf = (duration: number, kind = "video") =>
   ({
     id: 7,
     display_name: "Talk",
-    asset: { duration_s: duration, width: 1920, height: 1080, title: "Talk" },
+    asset: { duration_s: duration, width: 1920, height: 1080, title: "Talk", media_kind: kind },
   }) as unknown as DownloadJob;
 
-function open(duration: number) {
+function open(duration: number, kind = "video") {
   vi.spyOn(api, "downloadStoryboard").mockResolvedValue({ available: false } as never);
   const enqueue = vi.spyOn(api, "enqueueEdit").mockResolvedValue({} as never);
   const onClose = vi.fn();
   render(
     <QueryClientProvider client={new QueryClient()}>
-      <VideoEditor job={jobOf(duration)} onClose={onClose} />
+      <VideoEditor job={jobOf(duration, kind)} onClose={onClose} />
     </QueryClientProvider>,
   );
   const video = document.querySelector("video")!;
@@ -67,7 +71,7 @@ describe("VideoEditor — GIF", () => {
   it("makes a whole short video a GIF at the size picked, with no precise/fast choice", async () => {
     const { enqueue, onClose } = open(20);
     fireEvent.click(screen.getByRole("button", { name: "editor.format.gif" }));
-    fireEvent.click(screen.getByRole("button", { name: "640" }));
+    fireEvent.click(screen.getByRole("button", { name: "640 px" }));
     expect(screen.queryByText("editor.accurate.label")).toBeNull();
     expect(screen.getByText("editor.format.reencode")).toBeTruthy();
     fireEvent.click(screen.getByRole("button", { name: "editor.createGif" }));
@@ -116,6 +120,37 @@ describe("VideoEditor — GIF", () => {
     ).toBe(null);
   });
 
+  it("offers no GIF for an audio file, which has no picture to make one of", () => {
+    open(20, "audio");
+    expect(screen.queryByRole("button", { name: "editor.format.gif" })).toBeNull();
+    expect(screen.getByRole("button", { name: "editor.create" })).toBeTruthy();
+  });
+
+  it("keeps its notes' live region in place, so the first note is read out", () => {
+    open(20);
+    fireEvent.click(screen.getByRole("button", { name: "editor.format.gif" }));
+    // 20 s at 320: about 5–9 MB, nothing to say — but the region is already there.
+    fireEvent.click(screen.getByRole("button", { name: "320 px" }));
+    const region = document.querySelector("div[aria-live='polite']")!;
+    expect(region).toBeTruthy();
+    expect(region.textContent).toBe("");
+    // 20 s at 640: up to about 32 MB, said inside the same region.
+    fireEvent.click(screen.getByRole("button", { name: "640 px" }));
+    expect(document.querySelector("div[aria-live='polite']")).toBe(region);
+    expect(region.textContent).toBe("editor.format.segMayFail");
+  });
+
+  it("says one size for a short GIF, and none when nothing is kept", () => {
+    open(2);
+    fireEvent.click(screen.getByRole("button", { name: "editor.format.gif" }));
+    fireEvent.click(screen.getByRole("button", { name: "320 px" }));
+    // 2 s at 320: 0.46–0.94 MB, both shown as 1.
+    expect(screen.getByText("editor.format.estimateOne")).toBeTruthy();
+    fireEvent.click(screen.getByRole("button", { name: "editor.kept" }));
+    expect(screen.queryByText("editor.format.estimateOne")).toBeNull();
+    expect(screen.queryByText("editor.format.estimate")).toBeNull();
+  });
+
   it("Join needs two kept segments, and says so instead of going dead", () => {
     open(20);
     const join = screen.getByRole("button", { name: "editor.output.join" });

frontend/src/modules/files/VideoEditor.tsx

@@ -23,6 +23,7 @@ import { SURFACE } from "../../components/ui/surfaces";
 import { RangeTrack } from "../../components/ui/RangeTrack";
 import { trackLeft } from "../../components/ui/trackPosition";
 import { formatTimecode } from "../../lib/timecode";
+import { formatNumber } from "../../lib/format";
 import {
   estimateGif,
   gifEstimateText,
@@ -95,7 +96,10 @@ export default function VideoEditor({ job, onClose }: { job: DownloadJob; onClos
   const [accurate, setAccurate] = useState(true);
   const [format, setFormat] = useState<"video" | "gif">("video");
   const [side, setSide] = useState<GifSide>(GIF_DEFAULT_SIDE);
-  const gif = format === "gif";
+  // A GIF is made of the picture: an audio file has none (or only its cover), so it is offered for
+  // a video alone, as the server holds it.
+  const canGif = job.asset?.media_kind === "video";
+  const gif = canGif && format === "gif";
   const gifNoteId = useId();
   const [name, setName] = useState("");
 
@@ -268,6 +272,7 @@ export default function VideoEditor({ job, onClose }: { job: DownloadJob; onClos
     lo: 0,
     hi: 0,
   });
+  const gifTotalText = gifEstimateText(gifTotal, i18n.language);
   const gifNotes = GIF_NOTE_ORDER.flatMap((v) => gifSegs.filter((g) => g.verdict === v));
   const gifBlocked = gif && gifSegs.some((g) => g.verdict === "too_long");
   const joinReason = gif
@@ -625,46 +630,62 @@ export default function VideoEditor({ job, onClose }: { job: DownloadJob; onClos
         </div>
 
         {/* format: a video, or each kept segment a GIF */}
-        <div className="flex flex-wrap items-center gap-2 text-sm">
-          <span className="text-muted">{t("editor.format.label")}:</span>
-          <SegmentedToggle
-            ariaLabel={t("editor.format.label")}
-            value={format}
-            onChange={setFormat}
-            options={[
-              { value: "video", label: t("editor.format.video") },
-              { value: "gif", label: t("editor.format.gif") },
-            ]}
-          />
-          {gif && (
-            <>
-              <span className="ml-2 text-muted" aria-hidden="true">
-                {t("clip.gif.sizeLabel")}
-              </span>
-              <SegmentedToggle
-                ariaLabel={t("clip.gif.size")}
-                value={String(side)}
-                onChange={(v) => setSide(Number(v) as GifSide)}
-                options={GIF_SIDES.map((s) => ({ value: String(s), label: String(s) }))}
-              />
-              <span className="text-xs text-muted tabular-nums" aria-live="polite">
-                {t("editor.format.estimate", gifEstimateText(gifTotal, i18n.language))}
-              </span>
-            </>
-          )}
-        </div>
-        {gif && gifNotes.length > 0 && (
-          <ul id={gifNoteId} className="space-y-0.5 text-xs" aria-live="polite">
-            {gifNotes.map((g) => (
-              <li key={g.n} className={g.verdict === "too_long" ? "text-danger" : "text-warn"}>
-                {t(GIF_NOTE_KEY[g.verdict as keyof typeof GIF_NOTE_KEY], {
-                  n: g.n,
-                  length: tc(g.length),
-                  seconds: GIF_MAX_S,
-                })}
-              </li>
-            ))}
-          </ul>
+        {canGif && (
+          <div className="flex flex-wrap items-center gap-2 text-sm">
+            <span className="text-muted">{t("editor.format.label")}:</span>
+            <SegmentedToggle
+              ariaLabel={t("editor.format.label")}
+              value={format}
+              onChange={setFormat}
+              options={[
+                { value: "video", label: t("editor.format.video") },
+                { value: "gif", label: t("editor.format.gif") },
+              ]}
+            />
+            {gif && (
+              <>
+                <span className="ml-2 text-muted" aria-hidden="true">
+                  {t("clip.gif.sizeLabel")}
+                </span>
+                <SegmentedToggle
+                  ariaLabel={t("clip.gif.size")}
+                  value={String(side)}
+                  onChange={(v) => setSide(Number(v) as GifSide)}
+                  options={GIF_SIDES.map((s) => ({
+                    value: String(s),
+                    label: t("clip.gif.side", { n: formatNumber(s, i18n.language) }),
+                  }))}
+                />
+                {kept.length > 0 && (
+                  <span className="text-xs text-muted tabular-nums" aria-live="polite">
+                    {t(
+                      gifTotalText.single ? "editor.format.estimateOne" : "editor.format.estimate",
+                      gifTotalText,
+                    )}
+                  </span>
+                )}
+              </>
+            )}
+          </div>
+        )}
+        {/* Mounted for as long as GIF is chosen: a live region announces what changes inside it,
+            not what arrives together with it, and the first note is the one that counts. */}
+        {gif && (
+          <div id={gifNoteId} aria-live="polite">
+            {gifNotes.length > 0 && (
+              <ul className="space-y-0.5 text-xs">
+                {gifNotes.map((g) => (
+                  <li key={g.n} className={g.verdict === "too_long" ? "text-danger" : "text-warn"}>
+                    {t(GIF_NOTE_KEY[g.verdict as keyof typeof GIF_NOTE_KEY], {
+                      n: g.n,
+                      length: tc(g.length),
+                      seconds: GIF_MAX_S,
+                    })}
+                  </li>
+                ))}
+              </ul>
+            )}
+          </div>
         )}
 
         {/* crop + precision */}

frontend/src/watch/WatchPage.dom.test.tsx

@@ -184,6 +184,22 @@ describe("WatchPage media element", () => {
     expect(page.getByText(/drag the downloaded file in/)).toBeTruthy();
   });
 
+  it("a picture that does not load says so, rather than looking like a file without one", async () => {
+    window.history.replaceState({}, "", "/watch/tok-gif-gone");
+    mockMeta({
+      needs_password: false,
+      media_kind: "file",
+      preview: "image",
+      title: "Gone",
+      container: "gif",
+      allow_download: true,
+      file_url: "/gone.gif",
+    });
+    const page = render(<WatchPage />);
+    fireEvent.error(await page.findByRole("img", { name: "Gone" }));
+    expect((await page.findByRole("status")).textContent).toBe("Couldn't load the picture.");
+  });
+
   it("a view-only picture link shows the picture, without Download or the chat tip", async () => {
     window.history.replaceState({}, "", "/watch/tok-gif-view");
     mockMeta({

frontend/src/watch/WatchPage.tsx

@@ -488,7 +488,14 @@ function SharedPicture({ meta, nested }: { meta: FileMeta; nested: boolean }) {
           width={meta.width ?? undefined}
           height={meta.height ?? undefined}
           retries={1}
-          fallback={<FileIcon className="m-12 w-12 h-12 text-muted" aria-hidden />}
+          // A picture link always has a picture: a missing one failed to load, and says so —
+          // the bare file glyph would read as a file with no preview.
+          fallback={
+            <div role="status" className="flex flex-col items-center gap-2 px-12 py-10 text-muted">
+              <FileIcon className="w-12 h-12" aria-hidden />
+              <p className="text-sm">{T.pictureFailed}</p>
+            </div>
+          }
           className={clsx(
             "max-w-full h-auto w-auto mx-auto block",
             nested ? "max-h-[60dvh]" : "max-h-[80dvh]",

frontend/src/watch/watchStrings.ts

@@ -31,7 +31,8 @@ const STR = {
     open: "Open",
     folderEmpty: "This folder is empty.",
     play: "Play",
-    gifTip: "To share it in a chat, drag the downloaded file in: it moves everywhere.",
+    gifTip: "To share it in a chat, drag the downloaded file in: it plays everywhere.",
+    pictureFailed: "Couldn't load the picture.",
     files: (n: number) => (n === 1 ? "1 file" : `${n} files`),
   },
   hu: {
@@ -63,6 +64,7 @@ const STR = {
     folderEmpty: "Ez a mappa üres.",
     play: "Lejátszás",
     gifTip: "Csetbe a letöltött fájlt húzd be: az mindenhol mozog.",
+    pictureFailed: "Nem sikerült betölteni a képet.",
     files: (n: number) => `${n} fájl`,
   },
   de: {
@@ -94,7 +96,8 @@ const STR = {
     folderEmpty: "Dieser Ordner ist leer.",
     play: "Abspielen",
     gifTip:
-      "Zum Teilen in einem Chat die heruntergeladene Datei hineinziehen: Sie bewegt sich überall.",
+      "Zum Teilen in einem Chat die heruntergeladene Datei hineinziehen: Sie läuft überall als Animation.",
+    pictureFailed: "Das Bild konnte nicht geladen werden.",
     files: (n: number) => (n === 1 ? "1 Datei" : `${n} Dateien`),
   },
 } as const;