diff --git a/services/capture/src/capture-manager.js b/services/capture/src/capture-manager.js
index 8d331d9..141d829 100644
--- a/services/capture/src/capture-manager.js
+++ b/services/capture/src/capture-manager.js
@@ -360,8 +360,11 @@ const CONTAINER_EXT = {
 // keeps a short GOP. Muxed to a raw `mpeg2video` elementary stream (no
 // container) so raw2bmx ingests it via --mpeg2lg_*.
 const GROWING_VIDEO_ELEMENTARY_ARGS = [
-  '-c:v', 'mpeg2video', '-pix_fmt', 'yuv422p',
-  '-dc', '10', '-g', '15', '-bf', '2',
+  '-c:v', 'h264_nvenc', '-profile:v', 'high422',
+  '-preset', 'p1', '-tune', 'll',
+  '-rc', 'constqp', '-qp', '21',
+  '-pix_fmt', 'yuv422p',
+  '-g', '1',
 ];
 const GROWING_DEFAULT_BITRATE = '25M';
 const GROWING_EXT = 'mxf';
@@ -434,9 +437,9 @@ function deriveGrowingRaster(resolution, framerate, scanHint = null) {
 
   let rawFlag;
   if (height >= 1080) {
-    rawFlag = (scan === 'p') ? '--mpeg2lg_422p_hl_1080p' : '--mpeg2lg_422p_hl_1080i';
+    rawFlag = (scan === 'p') ? '--avci100_1080p' : '--avci100_1080i';
   } else if (height >= 720) {
-    rawFlag = '--mpeg2lg_422p_hl_720p';            // 720 is always progressive
+    rawFlag = '--avci100_720p';            // 720 is always progressive
     if (fpsNum == null) { r.ff = '60000/1001'; r.raw = '60000/1001'; }
   } else {
     rawFlag = '--mpeg2lg_422p_ml_576i';            // SD 576i (PAL); 25 fps
@@ -859,7 +862,7 @@ class CaptureManager {
       ...GROWING_VIDEO_ELEMENTARY_ARGS,
       '-b:v', vb, '-minrate', vb, '-maxrate', vb, '-bufsize', vb,
       '-r', ffRate,
-      '-f', 'mpeg2video', '@VF@',
+      '-f', 'h264', '@VF@',
       // (b) PCM s16le audio → "$AF"
       '-map', audioMap,
       '-c:a', 'pcm_s16le', '-ar', '48000', '-ac', String(ach),