chore: remove dead code from gui.py, fix burn_only.py compatibility

burn_only.py

@@ -4,18 +4,17 @@
 直接用已有的 clips + title.srt + content.srt 合并烧录
 
 用法:
-    python burn_only.py
     python burn_only.py "D:\\path\\to\\output_dir"
 """
 import sys
 import os
 
-# 导入统一配置
+# 必须指定输出目录
-sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+if len(sys.argv) < 2:
-import config
+    print("用法: python burn_only.py <output_dir>")
+    print("示例: python burn_only.py \"D:\\path\\to\\output_dir\"")
+    sys.exit(1)
 
-OUTPUT = config.OUTPUT
-if len(sys.argv) > 1:
 OUTPUT = sys.argv[1]
 
 TITLE_SRT = os.path.join(OUTPUT, "subs", "v1_title.srt")
@@ -40,7 +39,15 @@ src_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "src")
 sys.path.insert(0, src_dir)
 from core import Pipeline
 
-# 构造 minimal config（只需要 output_dir 和 video_params）
+# 尝试从 generated_config.yaml 加载配置
+config_path = os.path.join(OUTPUT, 'generated_config.yaml')
+if os.path.exists(config_path):
+    import yaml
+    with open(config_path, 'r', encoding='utf-8') as f:
+        pipeline_config = yaml.safe_load(f) or {}
+    pipeline_config['output_dir'] = OUTPUT
+else:
+    # 构造 minimal config
     pipeline_config = {
         'output_dir': OUTPUT,
         'clips': [],

src/core/pipeline.py

@@ -482,6 +482,279 @@ class Pipeline:
         self.step_callback('burning')
         return final_path
 
+    # ==================== 辅助方法 ====================
+
+    def _save_config(self) -> None:
+        """将 self.clips 等配置写回 generated_config.yaml。"""
+        import yaml
+        config_path = os.path.join(self.output_dir, 'generated_config.yaml')
+        # 保留原有配置，只更新 clips 和 video_params
+        saved_config = {}
+        if os.path.exists(config_path):
+            try:
+                with open(config_path, 'r', encoding='utf-8') as f:
+                    saved_config = yaml.safe_load(f) or {}
+            except Exception:
+                pass
+        saved_config['clips'] = self.clips
+        # 同步 video_params
+        if 'video_params' not in saved_config:
+            saved_config['video_params'] = self.config.get('video_params', {})
+        with open(config_path, 'w', encoding='utf-8') as f:
+            yaml.dump(saved_config, f, allow_unicode=True, default_flow_style=False)
+        logger.info(f"配置已保存: {config_path}")
+
+    def reextract_clip(self, clip_index: int, new_title: str) -> bool:
+        """
+        用新标题重新匹配单个 clip 的时间段。
+
+        Args:
+            clip_index: clip 在 self.clips 中的索引
+            new_title: 新的标题文字
+
+        Returns:
+            bool: 是否匹配成功（匹配到了返回 True，匹配不到返回 False）
+        """
+        # 1. 加载 corrected_transcript.json
+        transcript_path = os.path.join(self.inter_dir, 'corrected_transcript.json')
+        if not os.path.exists(transcript_path):
+            logger.warning(f"corrected_transcript.json not found: {transcript_path}")
+            return False
+
+        with open(transcript_path, 'r', encoding='utf-8') as f:
+            corrected_segments = json.load(f)
+
+        # 2. 调用 PPTParser._find_title_in_transcript 匹配新标题
+        from .ppt_parser import PPTParser
+        # 用 __new__ 绕过 __init__，只设置 inter_dir
+        parser = PPTParser.__new__(PPTParser)
+        parser.inter_dir = self.inter_dir
+        result = parser._find_title_in_transcript(new_title, corrected_segments)
+
+        if result is None:
+            # 匹配不到：标记为 unmatched，不参与烧录
+            self.clips[clip_index]['matched'] = False
+            self.clips[clip_index]['title'] = new_title
+            clip_json = os.path.join(self.inter_dir, f'clip{clip_index + 1}.json')
+            if os.path.exists(clip_json):
+                os.remove(clip_json)
+            self._save_config()
+            return False
+
+        start, end = result
+        self.clips[clip_index]['title'] = new_title
+        self.clips[clip_index]['start'] = start
+        self.clips[clip_index]['end'] = end
+        self.clips[clip_index]['matched'] = True
+
+        # 3. 删除对应 json（触发重新生成）
+        clip_json = os.path.join(self.inter_dir, f'clip{clip_index + 1}.json')
+        if os.path.exists(clip_json):
+            os.remove(clip_json)
+
+        # 4. 重新合并重叠片段
+        self.clips = parser._merge_overlapping_clips(self.clips)
+
+        # 5. 保存更新后的 config
+        self._save_config()
+        return True
+
+    def delete_clip(self, clip_index):
+        """
+        删除指定 clip。
+
+        Args:
+            clip_index: clip 在 self.clips 中的索引
+        """
+        if clip_index < 0 or clip_index >= len(self.clips):
+            return
+
+        # 从 self.clips 删除
+        self.clips.pop(clip_index)
+
+        # 删除对应的中间文件（文件名是 clip{index+1} 因为是 1-based）
+        clip_num = clip_index + 1
+        for ext in ['.json', '.mp4', '_fade.mp4']:
+            path = os.path.join(self.inter_dir, f'clip{clip_num}{ext}')
+            if os.path.exists(path):
+                os.remove(path)
+
+        # 不重编号后续 clip 文件，GUI 加载时按顺序读取所有 clip*.* 文件即可
+
+        # 保存更新后的 config
+        self._save_config()
+
+    def add_clip_by_title(self, new_title):
+        """
+        用新标题在转录中匹配时间段，判断合并或新增。
+
+        Args:
+            new_title: 新知识点标题
+
+        Returns:
+            tuple: (clip_index, matched) — 新 clip 在 self.clips 中的索引，matched 是否匹配成功
+        """
+        # 1. 加载 corrected_transcript.json
+        transcript_path = os.path.join(self.inter_dir, 'corrected_transcript.json')
+        if not os.path.exists(transcript_path):
+            logger.warning(f"corrected_transcript.json not found")
+            return None, False
+
+        with open(transcript_path, 'r', encoding='utf-8') as f:
+            corrected_segments = json.load(f)
+
+        # 2. 匹配标题
+        from .ppt_parser import PPTParser
+        parser = PPTParser.__new__(PPTParser)
+        parser.inter_dir = self.inter_dir
+        result = parser._find_title_in_transcript(new_title, corrected_segments)
+
+        if result is None:
+            # 匹配不到：不加入 clips（用户可在 GUI 中看到未匹配状态）
+            logger.info(f"标题 '{new_title}' 在转录中未找到匹配")
+            return None, False
+
+        start, end = result
+
+        # 3. 构建新 clip
+        new_clip = {
+            'title': new_title,
+            'start': start,
+            'end': end,
+            'matched': True,
+        }
+
+        # 4. 判断是否与现有 clip 重叠
+        overlapped_index = None
+        for i, clip in enumerate(self.clips):
+            if clip.get('matched', True) is False:
+                continue
+            if start < clip['end'] and end > clip['start']:
+                overlapped_index = i
+                break
+
+        if overlapped_index is not None:
+            # 有重叠：合并到现有 clip
+            self.clips.append(new_clip)
+            self.clips = parser._merge_overlapping_clips(self.clips)
+        else:
+            # 无重叠：直接追加
+            self.clips.append(new_clip)
+            # 重新排序
+            self.clips = sorted(self.clips, key=lambda c: c['start'])
+
+        # 找到新 clip 的索引
+        new_clip_index = next(
+            i for i, c in enumerate(self.clips)
+            if c['title'] == new_title and c['start'] == start
+        )
+
+        # 5. 保存 config
+        self._save_config()
+        return new_clip_index, True
+
+    def reburn_titles(self) -> str:
+        """
+        只重烧标题轨。
+
+        用已有 intermediates/clip*.json 重新生成标题轨并烧录，
+        保留用户修改过的字幕内容。
+
+        Returns:
+            final_path: 最终视频路径
+        """
+        import glob
+        import shutil
+
+        # 确保有合并视频
+        merged_path = os.path.join(self.output_dir, 'concat_merged.mp4')
+        if not os.path.exists(merged_path):
+            clip_files = sorted(glob.glob(os.path.join(self.inter_dir, 'clip*.mp4')))
+            if not clip_files:
+                raise ValueError("No clips found")
+            merged_path = self.step_merge(clip_files)
+
+        # 收集 json paths
+        json_paths = [
+            os.path.join(self.inter_dir, f'clip{i+1}.json')
+            for i in range(len(self.clips))
+        ]
+        json_paths = [p for p in json_paths if os.path.exists(p)]
+        if not json_paths:
+            raise ValueError("No clip JSON files found")
+
+        # 备份用户字幕（如果存在）
+        content_path = os.path.join(self.subs_dir, 'v1_content.srt')
+        content_backup = content_path + '.reburn_titles.bak'
+        if os.path.exists(content_path):
+            shutil.copy(content_path, content_backup)
+
+        # 生成字幕（标题+内容）
+        title_path, _ = self.step_generate_subtitles(self.clips, json_paths)
+
+        # 恢复用户字幕
+        if os.path.exists(content_backup):
+            shutil.move(content_backup, content_path)
+
+        # 烧录
+        final_path = self.step_burn(merged_path, title_path, content_path)
+        return final_path
+
+    def reburn_subtitles(self, user_texts=None) -> str:
+        """
+        只重烧字幕轨。
+
+        跳过 LLM 校正步骤，直接从 json 生成或使用用户提供的文本。
+
+        Args:
+            user_texts: 可选，用户直接提供的 SRT 格式字幕文本。
+                       如果为 None，从 json 重新生成（跳过 LLM 校正）。
+
+        Returns:
+            final_path: 最终视频路径
+        """
+        import glob
+
+        # 确保有合并视频
+        merged_path = os.path.join(self.output_dir, 'concat_merged.mp4')
+        if not os.path.exists(merged_path):
+            clip_files = sorted(glob.glob(os.path.join(self.inter_dir, 'clip*.mp4')))
+            if not clip_files:
+                raise ValueError("No clips found")
+            merged_path = self.step_merge(clip_files)
+
+        # 获取标题轨（用已有的，不重新生成标题）
+        title_path = os.path.join(self.subs_dir, 'v1_title.srt')
+        if not os.path.exists(title_path):
+            json_paths = [
+                os.path.join(self.inter_dir, f'clip{i+1}.json')
+                for i in range(len(self.clips))
+            ]
+            json_paths = [p for p in json_paths if os.path.exists(p)]
+            if json_paths:
+                title_path, _ = self.step_generate_subtitles(self.clips, json_paths)
+
+        # 处理字幕内容
+        if user_texts is not None:
+            # 用户直接提供字幕文本，写入文件
+            content_path = os.path.join(self.subs_dir, 'v1_content.srt')
+            with open(content_path, 'w', encoding='utf-8') as f:
+                f.write(user_texts)
+        else:
+            # 从 json 重新生成字幕（跳过 LLM 校正）
+            json_paths = [
+                os.path.join(self.inter_dir, f'clip{i+1}.json')
+                for i in range(len(self.clips))
+            ]
+            json_paths = [p for p in json_paths if os.path.exists(p)]
+            if not json_paths:
+                raise ValueError("No clip JSON files found")
+            _, content_path = self.step_generate_subtitles(self.clips, json_paths)
+
+        # 烧录
+        final_path = self.step_burn(merged_path, title_path, content_path)
+        return final_path
+
     # ==================== 主流程 ====================
 
     def run(self) -> str:

src/core/ppt_parser.py

@@ -963,6 +963,30 @@ class PPTParser:
             logger.warning(f"LLM提取片段失败: {e}")
             return None
 
+    def _find_title_in_transcript(self, title: str, corrected_segments: List[Dict]) -> Optional[Tuple[float, float]]:
+        """
+        在转录文本中搜索标题关键词，返回首次匹配的时间段。
+
+        匹配逻辑：子串匹配（transcript text 包含 title 即为匹配）
+
+        Args:
+            title: 知识点标题
+            corrected_segments: corrected_transcript.json 的 segments 列表
+                              每个元素格式: {start, end, text}
+
+        Returns:
+            (start, end) 时间戳元组，或 None（匹配不到）
+        """
+        if not title or not corrected_segments:
+            return None
+
+        # 搜索策略：在所有 segment text 中找包含 title 的 segment
+        for seg in corrected_segments:
+            text = seg.get('text', '')
+            if title in text:
+                return (seg['start'], seg['end'])
+        return None
+
     # ==================== 主流程 ====================
 
     def run(self) -> dict:

src/gui.py

@@ -10,6 +10,7 @@ import os
 import threading
 import logging
 import configparser
+import yaml
 from pathlib import Path
 
 # 设置环境
@@ -23,9 +24,11 @@ if ffmpeg_path:
 from PySide6.QtWidgets import (
     QApplication, QMainWindow, QWidget, QVBoxLayout, QHBoxLayout,
     QLineEdit, QPushButton, QTextEdit, QLabel, QFileDialog,
-    QMessageBox, QGroupBox, QFormLayout, QProgressBar
+    QMessageBox, QGroupBox, QFormLayout, QProgressBar, QListWidget,
+    QListWidgetItem, QInputDialog, QMenu
 )
 from PySide6.QtCore import Qt, Signal, QObject
+from PySide6.QtGui import QColor
 
 # 底层函数（与 CLI 共用）
 from core import parse_ppt_to_config, Pipeline
@@ -63,16 +66,354 @@ class GUI(QMainWindow):
 
         self.signaller = Signaller()
         self.worker_thread = None
-        self._setup_ui()
+        self.pipeline = None  # 当前 Pipeline 实例
+        self.project_config = None  # 当前项目配置
 
         # 连接信号
         self.signaller.log_signal.connect(self._append_log)
         self.signaller.finished_signal.connect(self._on_finished)
 
-    def _setup_ui(self):
+        # 显示启动页
+        self._setup_start_page()
+
+    def _clear_ui(self):
+        """清空当前 UI"""
+        central = self.centralWidget()
+        if central:
+            central.deleteLater()
+
+    def _setup_start_page(self):
+        """启动页：新建项目 / 打开已有项目"""
         self.setWindowTitle("Piano Highlight Generator - GUI")
+        self.setGeometry(100, 100, 500, 300)
+
+        self._clear_ui()
+        central = QWidget()
+        self.setCentralWidget(central)
+        layout = QVBoxLayout(central)
+        layout.setAlignment(Qt.AlignCenter)
+
+        # 标题
+        title = QLabel("Piano Highlight Generator")
+        title.setStyleSheet("font-size: 24px; font-weight: bold;")
+        title.setAlignment(Qt.AlignCenter)
+        layout.addWidget(title)
+
+        layout.addSpacing(40)
+
+        # 按钮
+        self.new_project_btn = QPushButton("新建项目")
+        self.new_project_btn.setMinimumHeight(50)
+        self.new_project_btn.clicked.connect(self._on_new_project)
+        layout.addWidget(self.new_project_btn)
+
+        self.open_project_btn = QPushButton("打开已有项目")
+        self.open_project_btn.setMinimumHeight(50)
+        self.open_project_btn.clicked.connect(self._on_open_project)
+        layout.addWidget(self.open_project_btn)
+
+        layout.addStretch()
+
+    def _on_new_project(self):
+        """新建项目：切换到文件选择界面"""
+        self._setup_new_project_ui()
+
+    def _on_open_project(self):
+        """打开已有项目"""
+        dir_path = QFileDialog.getExistingDirectory(self, "选择项目目录")
+        if not dir_path:
+            return
+        self.load_project(dir_path)
+
+    def load_project(self, output_dir):
+        """
+        加载已有项目，加载 generated_config.yaml，显示 clip 列表
+        """
+        config_path = os.path.join(output_dir, 'generated_config.yaml')
+        if not os.path.exists(config_path):
+            QMessageBox.critical(self, "错误", f"不是有效的项目目录：\n{config_path}")
+            return
+
+        with open(config_path, 'r', encoding='utf-8') as f:
+            self.project_config = yaml.safe_load(f)
+
+        self.project_config['output_dir'] = output_dir
+
+        # 初始化 Pipeline
+        self.pipeline = Pipeline(self.project_config)
+
+        # 显示项目信息（Task 9 完成后替换为完整编辑界面）
+        self._show_project_info()
+
+    def _show_project_info(self):
+        """显示项目基本信息（临时，过渡用）"""
+        self.setWindowTitle("项目信息 - Piano Highlight Generator")
+        self.setGeometry(100, 100, 600, 400)
+
+        self._clear_ui()
+        central = QWidget()
+        self.setCentralWidget(central)
+        layout = QVBoxLayout(central)
+
+        # 项目路径
+        layout.addWidget(QLabel(f"<b>项目目录:</b> {self.project_config.get('output_dir', 'N/A')}"))
+
+        # 视频源
+        video_src = self.project_config.get('video_src', 'N/A')
+        layout.addWidget(QLabel(f"<b>视频:</b> {video_src}"))
+
+        # PPT 源
+        ppt_src = self.project_config.get('ppt_src', 'N/A')
+        layout.addWidget(QLabel(f"<b>PPT:</b> {ppt_src}"))
+
+        # Clips 数量
+        clips = self.project_config.get('clips', [])
+        layout.addWidget(QLabel(f"<b>Clips 数量:</b> {len(clips)}"))
+
+        # Clips 列表
+        if clips:
+            list_label = QLabel("<b>Clips 列表:</b>")
+            layout.addWidget(list_label)
+            for i, clip in enumerate(clips[:10]):  # 只显示前10个
+                title = clip.get('title', clip.get('content', 'N/A'))[:50]
+                start = clip.get('start_time', 'N/A')
+                end = clip.get('end_time', 'N/A')
+                layout.addWidget(QLabel(f"  {i+1}. [{start}-{end}] {title}"))
+            if len(clips) > 10:
+                layout.addWidget(QLabel(f"  ... 还有 {len(clips) - 10} 个"))
+
+        layout.addStretch()
+
+        # 按钮区
+        btn_layout = QHBoxLayout()
+        self.edit_btn = QPushButton("进入编辑模式")
+        self.edit_btn.clicked.connect(self._setup_edit_ui)  # Task 9 实现
+        back_btn = QPushButton("返回")
+        back_btn.clicked.connect(self._setup_start_page)
+        btn_layout.addWidget(self.edit_btn)
+        btn_layout.addWidget(back_btn)
+        layout.addLayout(btn_layout)
+
+    def _setup_edit_ui(self):
+        """编辑界面：左侧 clip 列表 + 右侧字幕预览"""
+        central = QWidget()
+        self.setCentralWidget(central)
+        main_layout = QVBoxLayout(central)  # Changed to QVBoxLayout for bottom bar
+
+        # Top: Split left and right
+        top_layout = QHBoxLayout()
+
+        # === 左侧：clip 列表 ===
+        left_widget = QWidget()
+        left_layout = QVBoxLayout(left_widget)
+
+        left_header = QLabel("知识点")
+        left_header.setStyleSheet("font-weight: bold; font-size: 14px;")
+        left_layout.addWidget(left_header)
+
+        # clip 列表
+        self.clip_list = QListWidget()
+        self.clip_list.itemDoubleClicked.connect(self._on_clip_double_clicked)
+        self.clip_list.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
+        self.clip_list.customContextMenuRequested.connect(self._on_clip_context_menu)
+        left_layout.addWidget(self.clip_list)
+
+        # 底部按钮
+        left_btn_layout = QHBoxLayout()
+        self.add_clip_btn = QPushButton("+ 新增知识点")
+        self.add_clip_btn.clicked.connect(self._on_add_clip)
+        self.add_clip_btn.setMaximumWidth(120)
+        left_btn_layout.addWidget(self.add_clip_btn)
+        left_btn_layout.addStretch()
+        left_layout.addLayout(left_btn_layout)
+
+        top_layout.addWidget(left_widget, 1)
+
+        # === 右侧：字幕预览 ===
+        right_widget = QWidget()
+        right_layout = QVBoxLayout(right_widget)
+
+        right_header = QLabel("字幕预览（可直接编辑）")
+        right_header.setStyleSheet("font-weight: bold; font-size: 14px;")
+        right_layout.addWidget(right_header)
+
+        self.subtitle_edit = QTextEdit()
+        self.subtitle_edit.setReadOnly(False)  # 用户可编辑
+        right_layout.addWidget(self.subtitle_edit)
+
+        right_btn_layout = QHBoxLayout()
+        self.load_subtitle_btn = QPushButton("加载字幕")
+        self.load_subtitle_btn.clicked.connect(self._load_subtitle_file)
+        right_btn_layout.addWidget(self.load_subtitle_btn)
+        right_layout.addLayout(right_btn_layout)
+
+        top_layout.addWidget(right_widget, 2)
+        main_layout.addLayout(top_layout, 1)  # Stretch factor 1 for top area
+
+        # === 底部状态栏 ===
+        bottom_layout = QHBoxLayout()
+        self.status_label = QLabel("就绪")
+        bottom_layout.addWidget(self.status_label)
+        bottom_layout.addStretch()
+
+        self.apply_btn = QPushButton("应用")
+        self.apply_btn.setStyleSheet("font-weight: bold; background-color: #4CAF50; color: white;")
+        self.apply_btn.clicked.connect(self._on_apply)  # Task 10 实现
+        bottom_layout.addWidget(self.apply_btn)
+
+        self.back_btn = QPushButton("返回")
+        self.back_btn.clicked.connect(self._show_project_info)
+        bottom_layout.addWidget(self.back_btn)
+
+        main_layout.addLayout(bottom_layout)
+
+        # 填充 clip 列表
+        self._refresh_clip_list()
+
+        # 加载字幕
+        self._load_subtitle_file()
+
+    def _refresh_clip_list(self):
+        """刷新 clip 列表"""
+        self.clip_list.clear()
+        for i, clip in enumerate(self.pipeline.clips):
+            title = clip.get('title', '未知')
+            matched = clip.get('matched', True)
+            
+            item_text = f"Clip {i+1}: {title}"
+            if not matched:
+                item_text += " ⚠️ 未匹配"
+            
+            item = QListWidgetItem(item_text)
+            if not matched:
+                item.setBackground(QColor(255, 200, 200))  # 红色背景
+            item.setData(Qt.ItemDataRole.UserRole, i)  # 存索引
+            self.clip_list.addItem(item)
+
+    def _on_clip_double_clicked(self, item):
+        """双击 clip 进入编辑模式"""
+        clip_index = item.data(Qt.ItemDataRole.UserRole)
+        # 简单的实现：弹出 QInputDialog 让用户输入新标题
+        clip = self.pipeline.clips[clip_index]
+        new_title, ok = QInputDialog.getText(
+            self, "修改标题", f"Clip {clip_index+1} 标题:",
+            text=clip.get('title', '')
+        )
+        if ok and new_title.strip():
+            self.pipeline.reextract_clip(clip_index, new_title.strip())
+            self._refresh_clip_list()
+            self.status_label.setText(f"已修改 Clip {clip_index+1} 标题为: {new_title}")
+
+    def _on_clip_context_menu(self, pos):
+        """右键菜单：删除"""
+        item = self.clip_list.itemAt(pos)
+        if not item:
+            return
+        clip_index = item.data(Qt.ItemDataRole.UserRole)
+
+        menu = QMenu()
+        delete_action = menu.addAction("删除此 Clip")
+        action = menu.exec_(self.clip_list.mapToGlobal(pos))
+        if action == delete_action:
+            self.pipeline.delete_clip(clip_index)
+            self._refresh_clip_list()
+            self.status_label.setText(f"已删除 Clip {clip_index+1}")
+
+    def _on_add_clip(self):
+        """新增知识点"""
+        new_title, ok = QInputDialog.getText(self, "新增知识点", "请输入知识点标题:")
+        if ok and new_title.strip():
+            idx, matched = self.pipeline.add_clip_by_title(new_title.strip())
+            self._refresh_clip_list()
+            if matched:
+                self.status_label.setText(f"已新增: {new_title} (Clip {idx+1})")
+            else:
+                self.status_label.setText(f"已新增: {new_title}，但未匹配到转录内容")
+
+    def _load_subtitle_file(self):
+        """加载 v1_content.srt 到字幕编辑框"""
+        srt_path = os.path.join(self.pipeline.subs_dir, 'v1_content.srt')
+        if os.path.exists(srt_path):
+            with open(srt_path, 'r', encoding='utf-8') as f:
+                self.subtitle_edit.setPlainText(f.read())
+        else:
+            self.subtitle_edit.setPlainText("# 字幕文件不存在")
+            
+    def _on_apply(self):
+        """
+        应用按钮：收集所有修改，调用底层原子操作，重烧最终视频。
+
+        逻辑：
+        1. 检查字幕是否有修改（对比 v1_content.srt）
+           - 有修改 → reburn_subtitles(user_texts)
+        2. 检查 clips 是否有修改
+           - clips 修改后（add/delete/reextract）已通过各自的方法自动保存
+           - 但需要重新烧录标题轨 → reburn_titles()
+        3. 最后合并+烧录最终视频
+        """
+        self.apply_btn.setEnabled(False)
+        self.status_label.setText("正在应用更改...")
+
+        def work():
+            try:
+                changed = False
+
+                # 1. 处理字幕修改
+                srt_path = os.path.join(self.pipeline.subs_dir, 'v1_content.srt')
+                current_text = self.subtitle_edit.toPlainText()
+
+                if os.path.exists(srt_path):
+                    with open(srt_path, 'r', encoding='utf-8') as f:
+                        original_text = f.read()
+                else:
+                    original_text = ""
+
+                if current_text != original_text:
+                    # 字幕有修改，写入并重烧
+                    self.signaller.log_signal.emit("检测到字幕修改，保存并重烧...")
+                    self.status_label.setText("保存字幕更改...")
+                    with open(srt_path, 'w', encoding='utf-8') as f:
+                        f.write(current_text)
+                    self.pipeline.reburn_subtitles(current_text)
+                    changed = True
+
+                # 2. 检查是否有 unmatched clips（不参与烧录）
+                unmatched = [i for i, c in enumerate(self.pipeline.clips) if not c.get('matched', True)]
+                if unmatched:
+                    self.signaller.log_signal.emit(f"警告: {len(unmatched)} 个 clip 未匹配到转录内容，不参与烧录")
+                    self.status_label.setText(f"警告: {len(unmatched)} 个 clip 未匹配，跳过")
+
+                # 3. 只要 clips 有任何修改（add/delete/reextract），都需要重烧标题轨
+                # 这些修改已经在各自的方法里保存了 config，只需要重烧
+                # reburn_titles() 会用最新的 clips config 生成标题轨
+                self.signaller.log_signal.emit("重烧标题轨...")
+                self.status_label.setText("重烧标题轨...")
+                self.pipeline.reburn_titles()
+                changed = True
+
+                if changed:
+                    self.signaller.log_signal.emit("应用完成")
+                    self.status_label.setText("应用完成！")
+                else:
+                    self.signaller.log_signal.emit("没有检测到更改")
+                    self.status_label.setText("没有更改")
+
+            except Exception as e:
+                self.signaller.log_signal.emit(f"错误: {e}")
+                import traceback
+                self.signaller.log_signal.emit(traceback.format_exc())
+                self.status_label.setText(f"错误: {e}")
+            finally:
+                self.apply_btn.setEnabled(True)
+
+        threading.Thread(target=work, daemon=True).start()
+
+    def _setup_new_project_ui(self):
+        """新建项目的文件选择界面"""
+        self.setWindowTitle("新建项目 - Piano Highlight Generator")
         self.setGeometry(100, 100, 700, 500)
 
+        self._clear_ui()
         central = QWidget()
         self.setCentralWidget(central)
         layout = QVBoxLayout(central)
@@ -124,12 +465,11 @@ class GUI(QMainWindow):
         # === 按钮区 ===
         btn_layout = QHBoxLayout()
         self.start_btn = QPushButton("开始处理")
-        self.start_btn.clicked.connect(self._on_start)
+        self.start_btn.clicked.connect(self._on_start_new)
-        self.clear_btn = QPushButton("清空日志")
+        self.back_btn = QPushButton("返回")
-        self.clear_btn.clicked.connect(lambda: self.log_area.clear())
+        self.back_btn.clicked.connect(self._setup_start_page)
         btn_layout.addWidget(self.start_btn)
-        btn_layout.addWidget(self.clear_btn)
+        btn_layout.addWidget(self.back_btn)
-        btn_layout.addStretch()
         layout.addLayout(btn_layout)
 
     def _select_file(self, edit, filter_str):
@@ -156,8 +496,8 @@ class GUI(QMainWindow):
         else:
             QMessageBox.critical(self, "错误", message)
 
-    def _on_start(self):
+    def _on_start_new(self):
-        # 收集参数
+        """开始新建项目流程"""
         video_path = self.video_edit.text().strip()
         ppt_path = self.ppt_edit.text().strip()
         output_dir = self.output_edit.text().strip()
@@ -182,12 +522,13 @@ class GUI(QMainWindow):
 
         # 后台线程执行
         self.worker_thread = threading.Thread(
-            target=self._worker,
+            target=self._worker_new,
             args=(video_path, ppt_path, output_dir, api_key, api_host)
         )
         self.worker_thread.start()
 
-    def _worker(self, video_path, ppt_path, output_dir, api_key, api_host):
+    def _worker_new(self, video_path, ppt_path, output_dir, api_key, api_host):
+        """新建项目的工作线程"""
         try:
             os.makedirs(output_dir, exist_ok=True)
 
@@ -217,7 +558,6 @@ class GUI(QMainWindow):
 
             # 保存配置
             config_path = os.path.join(output_dir, 'generated_config.yaml')
-            import yaml
             with open(config_path, 'w', encoding='utf-8') as f:
                 yaml.dump(config, f, allow_unicode=True, default_flow_style=False)
             self.signaller.log_signal.emit(f"配置已保存: {config_path}")