feat: improve keyframe handling and encoding parameters

- Move keyframe interval from -g flag to SVT-AV1's keyint parameter
- Add enable-qm parameter for better quality management
- Disable quiet mode to show FFmpeg progress during encoding

src/commandBuilder.ts

@@ -28,8 +28,8 @@ export function encodingCommandBuilder(videoInfo: parsedVideoInfo): string {
   const profile = videoInfo.MPix < 1 ? profiles.DVD : profiles.BluRay;
   const args = [
     "ffmpeg \\\n",
-    "-v",
-    "quiet \\\n",
+    // "-v",
+    // "quiet \\\n",
     "-hide_banner \\\n",
     "-i",
     `"${videoInfo.filename}" \\\n`,
@@ -45,7 +45,9 @@ export function encodingCommandBuilder(videoInfo: parsedVideoInfo): string {
   args.push("-crf", profile.crf + " \\\n");
   args.push(
     "-svtav1-params",
-    `tune=0:film-grain=${profile.filmGrain}:scd=1:film-grain-denoise=1 \\\n`,
+    `keyint=${
+      Math.round(videoInfo.fps * 5)
+    }:tune=0:film-grain=${profile.filmGrain}:scd=1:film-grain-denoise=1:enable-overlays=1:enable-qm=1:qm-min=0:qm-max=15 \\\n`,
   );
   args.push("-preset", profile.preset + " \\\n");
 
@@ -65,7 +67,7 @@ export function encodingCommandBuilder(videoInfo: parsedVideoInfo): string {
     );
   }
 
-  args.push("-g", `${Math.round(videoInfo.fps * 5)} \\\n`);
+  // args.push("-g", `${Math.round(videoInfo.fps * 5)} \\\n`);
 
   if (videoInfo.metadata) {
     args.push("-metadata", `title="${videoInfo.metadata.title}" \\\n`);