✨ feat(av1-transfer): add process name alias and per-task progress bars

- Add -n/--process-name flag to set ffmpeg argv[0] alias (exec -a equivalent)
- Show real-time per-file progress via ffmpeg -progress pipe:1
- Use slot queue to manage per-worker tqdm bars (position 1..N)
- Add -pix_fmt yuv420p10le for 10-bit output

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

av1-transfer/main.py

@@ -2,82 +2,173 @@
 AV1 视频批量转码脚本
 
 使用方法:
-    python main.py -i <输入目录> -o <输出目录> [-w <并行数>]
+    python main.py -i <输入目录> -o <输出目录> [-w <并行数>] [-n <进程别名>]
 
 参数说明:
     -i, --input         输入目录路径（必需）
     -o, --output        输出目录路径（必需）
     -w, --workers       并行任务数，默认为 4
+    -n, --process-name  ffmpeg 进程别名（混淆进程名，等效于 exec -a <别名> ffmpeg）
 
 示例:
     python main.py -i /path/to/input -o /path/to/output
     python main.py -i ./videos -o ./converted -w 2
+    python main.py -i ./videos -o ./converted -w 2 -n my_stream_1
 """
 
 import argparse
+import queue
+import shutil
 import subprocess
+from concurrent.futures import ThreadPoolExecutor, as_completed
 from pathlib import Path
-from concurrent.futures import ThreadPoolExecutor
+
 from tqdm import tqdm
 
 # ================= 配置区域 =================
-DEFAULT_WORKERS = 4                 # 默认并行任务数
+DEFAULT_WORKERS = 4
 VIDEO_EXTS = {".mp4", ".mkv", ".mov", ".avi", ".flv", ".ts", ".webm"}
 # ============================================
 
-def transcode_one_file(file_info):
+# 每个 worker 进度条的格式
+SLOT_BAR_FORMAT = "{desc:<50} {percentage:3.0f}%|{bar}| {n:.0f}/{total:.0f}s"
+
+
+def get_duration(input_path):
+    """用 ffprobe 获取视频时长（秒），失败返回 None"""
+    result = subprocess.run(
+        [
+            "ffprobe", "-v", "error",
+            "-show_entries", "format=duration",
+            "-of", "default=noprint_wrappers=1:nokey=1",
+            str(input_path),
+        ],
+        capture_output=True,
+        text=True,
+    )
+    try:
+        return float(result.stdout.strip())
+    except (ValueError, AttributeError):
+        return None
+
+
+def transcode_one_file(file_info, overall_bar, slot_bars, slot_queue, process_name):
     """
-    单个文件转码函数
+    单个文件转码，实时更新对应 slot 的进度条。
     file_info: (输入完整路径, 输出完整路径)
     """
     input_path, output_path = file_info
 
-    # 确保输出目录存在
+    # 从队列中拿到一个空闲 slot
+    slot = slot_queue.get()
+    bar = slot_bars[slot]
+
+    try:
         output_path.parent.mkdir(parents=True, exist_ok=True)
 
-    # ffmpeg 命令
-    # -y: 覆盖已存在文件
-    # -loglevel error: 减少日志输出，避免干扰进度条
-    cmd = [
-        "ffmpeg", "-y", "-i", str(input_path),
+        duration = get_duration(input_path)
+        total_secs = int(duration) if duration else 1
+
+        bar.reset(total=total_secs)
+        short_name = input_path.name
+        if len(short_name) > 45:
+            short_name = short_name[:42] + "..."
+        bar.set_description(f"  {short_name}")
+
+        # 构建 ffmpeg 命令
+        # -progress pipe:1 将结构化进度输出到 stdout（key=value 格式）
+        ffmpeg_args = [
+            "-y",
+            "-progress", "pipe:1",
+            "-loglevel", "error",
+            "-i", str(input_path),
             "-c:v", "libsvtav1",
             "-crf", "30",
             "-preset", "6",
+            "-pix_fmt", "yuv420p10le",
         "-c:a", "copy",
-        str(output_path)
+            str(output_path),
         ]
 
+        if process_name:
+            # 用 executable 指定真实路径，argv[0] 设为别名
+            # 等效于 shell 的: exec -a <process_name> ffmpeg ...
+            ffmpeg_exe = shutil.which("ffmpeg")
+            if not ffmpeg_exe:
+                raise RuntimeError("找不到 ffmpeg 可执行文件")
+            cmd = [process_name] + ffmpeg_args
+            proc = subprocess.Popen(
+                cmd,
+                executable=ffmpeg_exe,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            )
+        else:
+            cmd = ["ffmpeg"] + ffmpeg_args
+            proc = subprocess.Popen(
+                cmd,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            )
+
+        # 实时解析 -progress 输出（out_time_us 字段，单位微秒）
+        last_secs = 0.0
+        for raw_line in proc.stdout:
+            line = raw_line.decode(errors="replace").strip()
+            if line.startswith("out_time_us="):
                 try:
-        # 使用 subprocess 运行，捕获 stderr 避免刷屏
-        subprocess.run(cmd, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.PIPE)
-        return True
-    except subprocess.CalledProcessError as e:
-        print(f"\n[错误] 转码失败: {input_path}\n原因: {e.stderr.decode()}")
+                    us = int(line.split("=", 1)[1])
+                    if duration and us > 0:
+                        cur_secs = us / 1_000_000
+                        delta = cur_secs - last_secs
+                        if delta > 0:
+                            # 避免浮点误差超出 total
+                            delta = min(delta, bar.total - bar.n)
+                            bar.update(delta)
+                            last_secs = cur_secs
+                except (ValueError, IndexError):
+                    pass
+
+        proc.wait()
+
+        if proc.returncode != 0:
+            err = proc.stderr.read().decode(errors="replace")
+            tqdm.write(f"\n[错误] 转码失败: {input_path}\n{err}")
             return False
 
+        return True
+
+    except Exception as e:
+        tqdm.write(f"\n[异常] {input_path}: {e}")
+        return False
+
+    finally:
+        # 重置 slot 进度条并归还 slot
+        bar.set_description("  [空闲]")
+        bar.reset(total=1)
+        overall_bar.update(1)
+        slot_queue.put(slot)
+
+
 def parse_args():
-    """解析命令行参数"""
     parser = argparse.ArgumentParser(
         description="AV1 视频批量转码脚本",
-        formatter_class=argparse.RawDescriptionHelpFormatter
-    )
-    parser.add_argument(
-        "-i", "--input",
-        type=str,
-        required=True,
-        help="输入目录路径"
-    )
-    parser.add_argument(
-        "-o", "--output",
-        type=str,
-        required=True,
-        help="输出目录路径"
+        formatter_class=argparse.RawDescriptionHelpFormatter,
     )
+    parser.add_argument("-i", "--input", type=str, required=True, help="输入目录路径")
+    parser.add_argument("-o", "--output", type=str, required=True, help="输出目录路径")
     parser.add_argument(
         "-w", "--workers",
         type=int,
         default=DEFAULT_WORKERS,
-        help=f"并行任务数（默认: {DEFAULT_WORKERS}）"
+        help=f"并行任务数（默认: {DEFAULT_WORKERS}）",
+    )
+    parser.add_argument(
+        "-n", "--process-name",
+        type=str,
+        default=None,
+        dest="process_name",
+        help="ffmpeg 进程别名，用于混淆进程名（如 my_stream_1）",
     )
     return parser.parse_args()
 
@@ -88,19 +179,19 @@ def main():
     input_root = Path(args.input).resolve()
     output_root = Path(args.output).resolve()
     max_workers = args.workers
+    process_name = args.process_name
 
     if not input_root.exists():
         print(f"错误: 输入目录 {input_root} 不存在")
         return
 
-    # 1. 扫描所有待处理文件
+    # 扫描所有待处理文件
     tasks = []
     print(f"正在扫描目录: {input_root} ...")
     for file in input_root.rglob("*"):
         if file.name.startswith("._"):
             continue
         if file.suffix.lower() in VIDEO_EXTS:
-            # 计算相对路径并更换后缀为 .mp4
             rel_path = file.relative_to(input_root)
             out_file = output_root / rel_path.with_suffix(".mp4")
             tasks.append((file, out_file))
@@ -110,14 +201,54 @@ def main():
         return
 
     print(f"共发现 {len(tasks)} 个文件，准备使用 {max_workers} 个并行任务进行转码...")
+    if process_name:
+        print(f"进程别名: {process_name}")
 
-    # 2. 使用线程池并行执行
-    # 注意：ffmpeg 内部是多线程的，max_workers 不宜设置得过大
+    # 初始化进度条
+    # position=0: 总进度；position=1..N: 各 worker 当前文件进度
+    overall_bar = tqdm(
+        total=len(tasks),
+        desc="总进度",
+        position=0,
+        leave=True,
+        unit="文件",
+    )
+
+    slot_queue: queue.Queue[int] = queue.Queue()
+    slot_bars: list[tqdm] = []
+    for i in range(max_workers):
+        bar = tqdm(
+            total=1,
+            desc="  [空闲]",
+            position=i + 1,
+            leave=True,
+            unit="s",
+            bar_format=SLOT_BAR_FORMAT,
+        )
+        slot_bars.append(bar)
+        slot_queue.put(i)
+
+    # 并行执行转码
     with ThreadPoolExecutor(max_workers=max_workers) as executor:
-        # 使用 tqdm 显示总进度
-        list(tqdm(executor.map(transcode_one_file, tasks), total=len(tasks), desc="转码进度"))
+        futures = [
+            executor.submit(
+                transcode_one_file,
+                task, overall_bar, slot_bars, slot_queue, process_name,
+            )
+            for task in tasks
+        ]
+        for f in as_completed(futures):
+            try:
+                f.result()
+            except Exception as e:
+                tqdm.write(f"[未捕获异常] {e}")
+
+    for bar in slot_bars:
+        bar.close()
+    overall_bar.close()
 
     print("\n任务全部完成！")
 
+
 if __name__ == "__main__":
     main()