chore(export): add ffmpeg mux timing breakdown

src/lib/exporter/modernVideoExporter.ts

@@ -1028,6 +1028,9 @@ export class ModernVideoExporter {
 				audioPlan.audioMode === "none" ? "default" : "audio",
 			),
 		);
+		if (result.metrics) {
+			this.finalizationStageMs.ffmpegAudioMuxBreakdown = result.metrics;
+		}
 		this.nativeExportSessionId = null;
 
 		if (!result.success) {
@@ -1109,6 +1112,9 @@ export class ModernVideoExporter {
 				"audio",
 			),
 		);
+		if (result.metrics) {
+			this.finalizationStageMs.ffmpegAudioMuxBreakdown = result.metrics;
+		}
 
 		if (!result.success || !result.data) {
 			return {

src/lib/exporter/types.ts

@@ -41,6 +41,17 @@ export interface ExportFinalizationStageMetrics {
 	ffmpegAudioMuxMs?: number;
 	nativeExportFinalizeMs?: number;
 	nativeEncoderFlushMs?: number;
+	ffmpegAudioMuxBreakdown?: ExportFfmpegAudioMuxBreakdown;
+}
+
+export interface ExportFfmpegAudioMuxBreakdown {
+	tempVideoWriteMs?: number;
+	tempEditedAudioWriteMs?: number;
+	ffmpegExecMs?: number;
+	muxedVideoReadMs?: number;
+	tempVideoBytes?: number;
+	tempEditedAudioBytes?: number;
+	muxedVideoBytes?: number;
 }
 
 export interface ExportMetrics {

src/lib/exporter/videoExporter.ts

@@ -781,6 +781,9 @@ export class VideoExporter {
 				audioPlan.audioMode === "none" ? "default" : "audio",
 			),
 		);
+		if (result.metrics) {
+			this.finalizationStageMs.ffmpegAudioMuxBreakdown = result.metrics;
+		}
 
 		if (!result.success || !result.data) {
 			return {
@@ -857,6 +860,9 @@ export class VideoExporter {
 				"audio",
 			),
 		);
+		if (result.metrics) {
+			this.finalizationStageMs.ffmpegAudioMuxBreakdown = result.metrics;
+		}
 
 		if (!result.success || !result.data) {
 			return {