ios 视频转码指令优化

lib/utils/video_util.dart

+import 'dart:io';
+
 import 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
 import 'package:ffmpeg_kit_flutter_new/return_code.dart';
 
@@ -7,10 +9,27 @@ class VideoUtil {
   /// 转码的同时，进行压缩
   ///
   static Future<bool> convertToMp4(String inputPath, String outputPath) async {
-    // final session = await FFmpegKit.execute(
-    //     '-i "$inputPath" -c:v libx264 -c:a aac -strict experimental -movflags faststart -f mp4 "$outputPath"');
-    final session = await FFmpegKit.execute(
-        '-i "$inputPath" -c:v libx264 -crf 28 -c:a aac -b:a 128k -strict experimental -movflags faststart -f mp4 "$outputPath"');
+
+    String cmd;
+    if(Platform.isIOS) {
+      // 构建命令
+      // 1. -c:v h264_videotoolbox : 启用 iOS 硬件加速
+      // 2. -b:v 1500k             : 限制视频码率为 1.5Mbps (体积小，手机看足够)
+      // 3. -vf scale=1280:-2      : 缩放到 720p (保持比例)
+      // 4. -c:a aac               : 音频转为 AAC (兼容性最好)
+      // 5. -b:a 128k              : 音频码率
+      cmd =
+          '-i "$inputPath" '
+          '-c:v h264_videotoolbox -b:v 1500k '
+          '-vf scale=1280:-2 '
+          '-c:a aac -b:a 128k '
+          '"$outputPath"';
+
+      print("开始极速转码: $cmd");
+    } else {
+      cmd = '-i "$inputPath" -c:v libx264 -crf 28 -c:a aac -b:a 128k -strict experimental -movflags faststart -f mp4 "$outputPath"';
+    }
+    final session = await FFmpegKit.execute(cmd);
     final returnCode = await session.getReturnCode();
     return ReturnCode.isSuccess(returnCode);
   }