fix: 修复 ffmpeg 合并视频 尺寸不对有黑边的bug

src/BowongModalFunctions/utils/VideoUtils.py

@@ -514,6 +514,26 @@ class VideoUtils:
         total_videos = len(media_paths)
         if total_videos == 0:
             raise ValueError("没有可以合并的视频源")
+
+        # 自动检测所有视频的宽高和音频流，找出最大值
+        max_width = 0
+        max_height = 0
+        has_audio = []
+        for media_path in media_paths:
+            width, height = await VideoUtils.ffprobe_video_size_async(media_path)
+            max_width = max(max_width, width)
+            max_height = max(max_height, height)
+            # 检查是否有音频流
+            metadata = VideoUtils.ffprobe_media_metadata(media_path)
+            audio_exists = any(stream.codec_type == "audio" for stream in metadata.streams)
+            has_audio.append(audio_exists)
+            logger.info(f"{media_path} - 音频流: {'存在' if audio_exists else '不存在'}")
+
+        # 使用检测到的最大宽高作为目标尺寸
+        target_width = max_width
+        target_height = max_height
+        logger.info(f"检测到最大分辨率: {target_width}x{target_height}")
+
         if not output_path:
             output_path = FileUtils.file_path_extend(media_paths[0], "concat")
         os.makedirs(os.path.dirname(output_path), exist_ok=True)
@@ -523,18 +543,22 @@ class VideoUtils:
             ffmpeg_cmd.input(input_path)
         # 2. 统一所有视频的格式、分辨率和帧率
         for i in range(total_videos):
-            filter_complex.extend(
-                [
-                    # 先缩放到统一分辨率，然后设置帧率和格式
-                    f"[{i}:v]scale={target_width}:{target_height}:force_original_aspect_ratio=decrease,"
-                    f"pad={target_width}:{target_height}:(ow-iw)/2:(oh-ih)/2,"
-                    f"setsar=1:1,"  # 新增强制设置SAR
-                    f"fps=30,format=yuv420p[v{i}]",
-                    # 修改音频过滤器，确保输出为AAC兼容格式
-                    # f"[{i}:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo[a{i}]",
-                    f"[{i}:a]aformat=sample_fmts=s16:sample_rates=44100:channel_layouts=stereo[a{i}]",
-                ]
+            # 视频流处理
+            filter_complex.append(
+                f"[{i}:v]scale={target_width}:{target_height}:force_original_aspect_ratio=increase,"
+                f"crop={target_width}:{target_height},"
+                f"setsar=1:1,"
+                f"fps=30,format=yuv420p[v{i}]"
             )
+            # 音频流处理：如果有音频则使用原音频，否则生成静默音频
+            if has_audio[i]:
+                filter_complex.append(
+                    f"[{i}:a]aformat=sample_fmts=s16:sample_rates=44100:channel_layouts=stereo[a{i}]"
+                )
+            else:
+                filter_complex.append(
+                    f"anullsrc=channel_layout=stereo:sample_rate=44100[a{i}]"
+                )
         # 3. 准备处理后的视频流和音频流的连接字符串
         video_streams = "".join(f"[v{i}]" for i in range(total_videos))
         audio_streams = "".join(f"[a{i}]" for i in range(total_videos))
@@ -930,6 +954,20 @@ class VideoUtils:
         total_videos = len(media_paths)
         if total_videos == 0:
             raise ValueError("没有可以合并的视频源")
+
+        # 自动检测所有视频的宽高，找出最大值
+        max_width = 0
+        max_height = 0
+        for media_path in media_paths:
+            width, height = await VideoUtils.ffprobe_video_size_async(media_path)
+            max_width = max(max_width, width)
+            max_height = max(max_height, height)
+
+        # 使用检测到的最大宽高作为目标尺寸
+        target_width = max_width
+        target_height = max_height
+        logger.info(f"检测到最大分辨率: {target_width}x{target_height}")
+
         if not output_path:
             output_path = FileUtils.file_path_extend(media_paths[0], "concat_video_only")
         os.makedirs(os.path.dirname(output_path), exist_ok=True)
@@ -940,10 +978,10 @@ class VideoUtils:
         # 2. 统一所有视频的格式、分辨率和帧率（仅处理视频流）
         for i in range(total_videos):
             filter_complex.append(
-                # 先缩放到统一分辨率，然后设置帧率和格式
-                f"[{i}:v]scale={target_width}:{target_height}:force_original_aspect_ratio=decrease,"
-                f"pad={target_width}:{target_height}:(ow-iw)/2:(oh-ih)/2,"
-                f"setsar=1:1,"  # 强制设置SAR
+                # 放大到目标尺寸并裁剪，保持不变形
+                f"[{i}:v]scale={target_width}:{target_height}:force_original_aspect_ratio=increase,"
+                f"crop={target_width}:{target_height},"
+                f"setsar=1:1,"
                 f"fps=30,format=yuv420p[v{i}]"
             )