From 082a8e65d04fff1e4cb7115201bd120331ca8a40 Mon Sep 17 00:00:00 2001
From: lml <lmllovezml@gmail.com>
Date: Tue, 17 Mar 2026 22:15:26 +0800
Subject: [PATCH] ffmpeg - Fill timestamp gaps with silence

---
 lib/converter/ffmpeg_macos.dart   | 6 ++++++
 lib/converter/ffmpeg_windows.dart | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/converter/ffmpeg_macos.dart b/lib/converter/ffmpeg_macos.dart
index ba00256..77bb241 100644
--- a/lib/converter/ffmpeg_macos.dart
+++ b/lib/converter/ffmpeg_macos.dart
@@ -34,6 +34,8 @@ class FFmpegMacOsConverter implements WhisperAudioConverter {
     }
 
     // FFmpeg arguments optimized for Whisper.cpp:
+    // -map 0:a:0 : Select first audio stream explicitly
+    // -af aresample=async=1:first_pts=0 : Fill timestamp gaps with silence
     // -ar 16000 : 16kHz sampling rate
     // -ac 1     : Mono channel
     // -c:a pcm_s16le : 16-bit little-endian PCM (WAV)
@@ -41,6 +43,10 @@ class FFmpegMacOsConverter implements WhisperAudioConverter {
       '-y',
       '-i',
       '"${input.path}"',
+      '-map',
+      '0:a:0',
+      '-af',
+      'aresample=async=1:first_pts=0',
       '-ar',
       '16000',
       '-ac',
diff --git a/lib/converter/ffmpeg_windows.dart b/lib/converter/ffmpeg_windows.dart
index c03de5b..870a000 100644
--- a/lib/converter/ffmpeg_windows.dart
+++ b/lib/converter/ffmpeg_windows.dart
@@ -25,6 +25,8 @@ class FFmpegWindowsConverter implements WhisperAudioConverter {
     }
 
     // FFmpeg arguments optimized for Whisper.cpp:
+    // -map 0:a:0 : Select first audio stream explicitly
+    // -af aresample=async=1:first_pts=0 : Fill timestamp gaps with silence
     // -ar 16000 : 16kHz sampling rate
     // -ac 1     : Mono channel
     // -c:a pcm_s16le : 16-bit little-endian PCM (WAV)
@@ -32,6 +34,10 @@ class FFmpegWindowsConverter implements WhisperAudioConverter {
       '-y',
       '-i',
       '"${input.path}"',
+      '-map',
+      '0:a:0',
+      '-af',
+      'aresample=async=1:first_pts=0',
       '-ar',
       '16000',
       '-ac',