diff --git a/scripts/patch_avci_classes.py b/scripts/patch_avci_classes.py
new file mode 100644
index 0000000..27180b6
--- /dev/null
+++ b/scripts/patch_avci_classes.py
@@ -0,0 +1,113 @@
+import sys
+
+path = '/opt/wild-dragon/services/capture/src/capture-manager.js'
+src = open(path).read()
+
+patches = [
+  # 1. Replace static GROWING_VIDEO_ELEMENTARY_ARGS with a function
+  (
+    """const GROWING_VIDEO_ELEMENTARY_ARGS = [
+  '-c:v', 'libx264', '-profile:v', 'high422', '-level', '4.2',
+  '-preset', 'ultrafast', '-tune', 'zerolatency',
+  '-pix_fmt', 'yuv422p10le',
+  '-x264-params', 'avcintra-class=100:bframes=0:keyint=1:scenecut=0',
+  '-aud', '1',
+];
+const GROWING_DEFAULT_BITRATE = '25M';""",
+    """// AVC-Intra elementary encode args per class (50 / 100 / 200).
+const GROWING_AVCI_CLASS = { avci50: 50, avci100: 100, avci200: 200 };
+function growingVideoElementaryArgs(codec) {
+  const cls = GROWING_AVCI_CLASS[codec] || 100;
+  return [
+    '-c:v', 'libx264', '-profile:v', 'high422', '-level', '4.2',
+    '-preset', 'ultrafast', '-tune', 'zerolatency',
+    '-pix_fmt', 'yuv422p10le',
+    '-x264-params', `avcintra-class=${cls}:bframes=0:keyint=1:scenecut=0`,
+    '-aud', '1',
+  ];
+}
+const GROWING_DEFAULT_BITRATE = '25M';""",
+    'GROWING_VIDEO_ELEMENTARY_ARGS -> growingVideoElementaryArgs()',
+  ),
+  # 2. growingCodec() / growingExtFor() — 4-way
+  (
+    """const growingCodec = () => (process.env.GROWING_CODEC === 'hevc_nvenc' ? 'hevc_nvenc' : 'avci100');
+// File extension per growing codec.
+const growingExtFor = (codec) => (codec === 'hevc_nvenc' ? 'mov' : 'mxf');""",
+    """// Valid growing codec values: 'avci50' | 'avci100' | 'avci200' | 'hevc_nvenc'
+const GROWING_AVC_CODECS = new Set(['avci50', 'avci100', 'avci200']);
+const growingCodec = () => {
+  const v = process.env.GROWING_CODEC;
+  if (v === 'hevc_nvenc') return 'hevc_nvenc';
+  if (v === 'avci50')  return 'avci50';
+  if (v === 'avci200') return 'avci200';
+  return 'avci100'; // default
+};
+// File extension per growing codec.
+const growingExtFor = (codec) => (codec === 'hevc_nvenc' ? 'mov' : 'mxf');""",
+    'growingCodec() 4-way',
+  ),
+  # 3. deriveGrowingRaster signature — add codec param
+  (
+    'function deriveGrowingRaster(resolution, framerate, scanHint = null) {',
+    "function deriveGrowingRaster(resolution, framerate, scanHint = null, codec = 'avci100') {",
+    'deriveGrowingRaster signature',
+  ),
+  # 4. rawFlag block — class-switch
+  (
+    """  // AVC-Intra 100 raster flags. --avci100_1080p accepts true 1080p59.94 (verified).
+  let rawFlag;
+  if (height >= 1080) {
+    rawFlag = (scan === 'i') ? '--avci100_1080i' : '--avci100_1080p';
+  } else if (height >= 720) {
+    rawFlag = '--avci100_720p';
+    if (fpsNum == null) { r.ff = '60000/1001'; r.raw = '60000/1001'; }
+  } else {
+    rawFlag = '--mpeg2lg_422p_ml_576i';
+    r.ff = '25'; r.raw = '25';
+  }""",
+    """  // AVC-Intra raster flags — class from codec name ('avci50'/'avci100'/'avci200').
+  const avciClass = GROWING_AVCI_CLASS[codec] || 100;
+  let rawFlag;
+  if (height >= 1080) {
+    rawFlag = (scan === 'i') ? `--avci${avciClass}_1080i` : `--avci${avciClass}_1080p`;
+  } else if (height >= 720) {
+    rawFlag = `--avci${avciClass}_720p`;
+    if (fpsNum == null) { r.ff = '60000/1001'; r.raw = '60000/1001'; }
+  } else {
+    rawFlag = '--mpeg2lg_422p_ml_576i';
+    r.ff = '25'; r.raw = '25';
+  }""",
+    'rawFlag class-switch',
+  ),
+  # 5. _buildGrowingOrchestrator signature + deriveGrowingRaster call
+  (
+    """  _buildGrowingOrchestrator({ inputArgs, videoBitrate, resolution, framerate, audioChannels, outPath, hlsDir, videoCodec, audioMap = '0:a:0?', interlaced = false }) {
+    const { rawFlag, frameRate, ffRate } = deriveGrowingRaster(resolution, framerate, interlaced ? 'i' : 'p');""",
+    """  _buildGrowingOrchestrator({ inputArgs, videoBitrate, resolution, framerate, audioChannels, outPath, hlsDir, videoCodec, growingCodecName = 'avci100', audioMap = '0:a:0?', interlaced = false }) {
+    const { rawFlag, frameRate, ffRate } = deriveGrowingRaster(resolution, framerate, interlaced ? 'i' : 'p', growingCodecName);""",
+    '_buildGrowingOrchestrator signature',
+  ),
+  # 6. Spread GROWING_VIDEO_ELEMENTARY_ARGS -> function call
+  (
+    '      ...GROWING_VIDEO_ELEMENTARY_ARGS,',
+    '      ...growingVideoElementaryArgs(growingCodecName),',
+    'spread -> growingVideoElementaryArgs(growingCodecName)',
+  ),
+]
+
+ok = True
+for old, new, label in patches:
+    if old in src:
+        src = src.replace(old, new, 1)
+        print(f'  OK  {label}')
+    else:
+        print(f'  FAIL {label}')
+        ok = False
+
+if ok:
+    open(path, 'w').write(src)
+    print('capture-manager.js written OK')
+else:
+    print('ABORTED — not writing (some patches failed)')
+    sys.exit(1)