diff --git a/.changeset/green-colts-impress.md b/.changeset/green-colts-impress.md
new file mode 100644
index 00000000..1cf5b44c
--- /dev/null
+++ b/.changeset/green-colts-impress.md
@@ -0,0 +1,5 @@
+---
+'@webav/av-cliper': patch
+---
+
+fix: IDR frame recognition for HEVC #306
diff --git a/packages/av-cliper/src/clips/mp4-clip.ts b/packages/av-cliper/src/clips/mp4-clip.ts
index fc5c58c0..f5c1bb49 100644
--- a/packages/av-cliper/src/clips/mp4-clip.ts
+++ b/packages/av-cliper/src/clips/mp4-clip.ts
@@ -1216,7 +1216,8 @@ function isIDRFrame(u8Arr: Uint8Array, type: MP4Sample['description']['type']) {
     if (type === 'avc1') {
       if ((dv.getUint8(i + 4) & 0x1f) === 5) return true;
     } else if (type === 'hvc1') {
-      if (((dv.getUint8(i + 4) >> 1) & 0x3f) === 20) return true;
+      const nalUnitType = (dv.getUint8(i + 4) >> 1) & 0x3f;
+      if (nalUnitType === 19 || nalUnitType === 20) return true;
     }
     // 跳至下一个 NALU 继续检查
     i += dv.getUint32(i) + 4;