#1303: frame times in i128 via Tick::from_rational (a hostile F1:i64::MAX rate can't overflow)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/codecs/src/y4m.rs

@@ -180,7 +180,7 @@ impl Y4mSource {
             return Err(bad("no complete frames"));
         }
         let color = ColorInfo { matrix: filmcraft_frame::default_matrix(w, h), range: if full { Range::Full } else { Range::Limited }, ..ColorInfo::REC709 };
-        let duration = Tick::from_rational(frames.len() as i64 * rate.den, 1, rate.num);
+        let duration = Tick::from_rational(frames.len() as i64, rate.den, rate.num);
         let bitrate = (frame_bytes as u64 * 8).checked_mul(rate.num as u64).map(|b| b / rate.den as u64);
         let info = MediaInfo {
             name: name.to_string(),
@@ -244,7 +244,7 @@ impl Y4mSource {
             data: pixels,
             color: v.color,
             par: v.par,
-            pts: Tick::from_rational(idx as i64 * self.rate.den, 1, self.rate.num),
+            pts: Tick::from_rational(idx as i64, self.rate.den, self.rate.num),
         })
     }
 }

crates/codecs/tests/y4m_file.rs

@@ -99,9 +99,17 @@ fn damaged_and_hostile_y4m_files_fail_without_panicking() {
         b[i] ^= 0x41;
         cases.push(b);
     }
-    for header in
-        ["W99999999 H99999999 F25:1", "W0 H4 F25:1", "W6 H4 F0:0", "W6 H4 F25:0", "W6 H4 F25:1 C411", "W6 H4 F25:1 Cbogus", "W6 H4 A0:0 F-5:1", "H4 F25:1"]
-    {
+    for header in [
+        "W99999999 H99999999 F25:1",
+        "W0 H4 F25:1",
+        "W6 H4 F0:0",
+        "W6 H4 F25:0",
+        "W6 H4 F25:1 C411",
+        "W6 H4 F25:1 Cbogus",
+        "W6 H4 A0:0 F-5:1",
+        "H4 F25:1",
+        "W6 H4 F1:9223372036854775807",
+    ] {
         cases.push(y4m(header, "FRAME", &[vec![0; 36]]));
     }
     for (i, b) in cases.into_iter().enumerate() {