## Task

Evaluate this code review comment. Read the source file and determine if the issue is valid.

**Instructions:**
1. Read the file mentioned in the review: `packages/core/ai_content_platform/vimax/adapters/video_adapter.py`
2. Check line 347 and surrounding context
3. Determine if the review feedback is valid
4. If valid: Fix the issue in the code
5. If invalid: Explain why the feedback doesn't apply

**Important:** Be concise. Either fix the code or explain in 2-3 sentences why it's not applicable.

---

# Review Comment

- **Author:** gemini-code-assist[bot]
- **File:** `packages/core/ai_content_platform/vimax/adapters/video_adapter.py`
- **Line:** 347
- **Date:** 2026-02-03
- **Comment ID:** 2756900253
- **URL:** https://github.com/donghaozhang/video-agent-skill/pull/16#discussion_r2756900253

---

![high](https://www.gstatic.com/codereviewagent/high-priority.svg)

The use of `subprocess.run` here is a blocking call, which will freeze the entire asyncio event loop while the `ffmpeg` command is running. In an asynchronous function like `concatenate_videos`, it's crucial to use non-blocking subprocess calls to maintain the benefits of async I/O.

I suggest replacing `subprocess.run` with `asyncio.create_subprocess_exec` to execute the `ffmpeg` command asynchronously. This will prevent blocking the event loop, especially for potentially long-running video processing tasks.

```suggestion
            process = await asyncio.create_subprocess_exec(
                *cmd,
                stdout=asyncio.subprocess.PIPE,
                stderr=asyncio.subprocess.PIPE
            )
            stdout, stderr = await process.communicate()

            if process.returncode != 0:
                self.logger.warning(f"FFmpeg concat may have failed: {stderr.decode()}")
```
