From 7263f2d837b48358cd67956cd40cd28a1aaf7dff Mon Sep 17 00:00:00 2001
From: yumoqing <yumoqing@gmail.com>
Date: Mon, 29 Jun 2026 23:51:19 +0800
Subject: [PATCH] fix: re-encode audio to AAC instead of copy for mp4
 compatibility

-c copy may produce mp4 files with AC3/DTS/FLAC audio that macOS
AVPlayer cannot decode, resulting in silent playback.
Change to -c:v copy -c:a aac -b:a 192k to preserve video quality
while ensuring universally playable audio.
---
 Sources/StreamRecorderKit/FFmpegRecorder.swift | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sources/StreamRecorderKit/FFmpegRecorder.swift b/Sources/StreamRecorderKit/FFmpegRecorder.swift
index a02c2b5..2481e36 100644
--- a/Sources/StreamRecorderKit/FFmpegRecorder.swift
+++ b/Sources/StreamRecorderKit/FFmpegRecorder.swift
@@ -56,7 +56,9 @@ public final class FFmpegRecorder: StreamRecorderEngine {
             args += ["-t", String(duration)]
         }
         args += [
-            "-c", "copy",
+            "-c:v", "copy",
+            "-c:a", "aac",
+            "-b:a", "192k",
             "-movflags", "+faststart",
             outputPath
         ]