# How to Troubleshoot ReClip Network Errors: A Complete Diagnostic Guide

> Troubleshoot ReClip network errors by diagnosing Flask API, yt-dlp subprocess, and container networking issues. Learn specific timeout and error handling in app.py.

- Repository: [Avery Gan/reclip](https://github.com/averygan/reclip)
- Tags: how-to-guide
- Published: 2026-09-03

---

**ReClip network errors are diagnosed by tracing three layers—Flask API, yt-dlp subprocess execution, and container networking—with specific timeout and error handling logic located in [`app.py`](https://github.com/averygan/reclip/blob/main/app.py).**

ReClip is a lightweight Flask application that orchestrates **yt-dlp** for video metadata retrieval and downloads. When network errors occur, they typically manifest at one of three distinct points in the request lifecycle. Understanding this architecture according to the averygan/reclip source code is essential for rapid troubleshooting.

## Where Network Errors Originate in ReClip

ReClip delegates all network activity to external `yt-dlp` processes. This design means network errors are captured from subprocess output rather than handled directly by Python networking libraries.

| Layer | Failure Point | Code Location |
|-------|-------------|---------------|
| **Client → Flask** | Request never reaches the server | `@app.route("/api/info")` at lines [97-140](https://github.com/averygan/reclip/blob/main/app.py#L97-L140) |
| **Flask → yt-dlp** | Subprocess returns non-zero exit code | `subprocess.run()` calls at lines [104-108](https://github.com/averygan/reclip/blob/main/app.py#L104-L108), [50-55](https://github.com/averygan/reclip/blob/main/app.py#L50-L55), [36-45](https://github.com/averygan/reclip/blob/main/app.py#L36-L45) |
| **Container networking** | DNS or outbound connectivity failure | [`docker-compose.yml`](https://github.com/averygan/reclip/blob/main/docker-compose.yml) port mapping at lines [1-9](https://github.com/averygan/reclip/blob/main/docker-compose.yml#L1-L9) |

The core execution pattern in [`app.py`](https://github.com/averygan/reclip/blob/main/app.py) follows this structure:

```python

# From app.py lines 104-108 (info endpoint)

cmd = ["yt-dlp", "--no-playlist", "-j", url]
result = subprocess.run(cmd, capture_output=True, text=True, timeout=60)
if result.returncode != 0:
    return jsonify({"error": result.stderr.strip().split("\n")[-1]}), 500

```

## Common ReClip Network Error Symptoms and Causes

Each error message returned by ReClip maps to a specific root cause. Use this reference to accelerate your diagnosis.

| Error Message | Root Cause | Immediate Verification Step |
|-------------|-----------|---------------------------|
| `"Timed out fetching video info"` | Video host response exceeded 60-second timeout | Run `yt-dlp -j <url>` directly on the host |
| `"Download timed out (5 min limit)"` | Download exceeded 300-second limit in `run_download` | Check line [84](https://github.com/averygan/reclip/blob/main/app.py#L84) timeout value |
| `[Errno 11001] getaddrinfo failed` | DNS resolution failure inside container | Execute `cat /etc/resolv.conf` in container |
| `Connection reset by peer` | Remote host terminated TCP connection | Add `--verbose` flag to yt-dlp command |
| `No such file or directory: yt-dlp` | Binary missing from container image | Run `docker exec <container> yt-dlp --version` |
| `HTTP Error 403: Forbidden` | Age restriction, region block, or rate limiting | Test with `--proxy` or `--geo-bypass` flags |

## Step-by-Step ReClip Network Troubleshooting

### 1. Verify Flask Service Accessibility

Confirm the HTTP layer functions before investigating deeper network issues.

```bash
curl http://localhost:8899/

```

A successful response indicates the Flask server and Docker port mapping (`8899:8899` in [`docker-compose.yml`](https://github.com/averygan/reclip/blob/main/docker-compose.yml)) are operational. No response suggests firewall, reverse proxy, or Docker networking misconfiguration.

### 2. Inspect Container Logs for Startup Failures

```bash
docker logs <reclip_container_name>

```

Early failures—missing Python dependencies or `yt-dlp` installation problems—surface here. The `Dockerfile` responsibility includes ensuring `yt-dlp` is available in the container image.

### 3. Validate yt-dlp Operation Inside Container

Execute a manual test using identical parameters to ReClip's internal calls:

```bash
docker exec -it reclip_app yt-dlp -j "https://www.youtube.com/watch?v=dQw4w9WgXcQ"

```

This isolates whether the error originates from yt-dlp itself or ReClip's subprocess handling.

### 4. Test Container Outbound Connectivity

```bash
docker exec -it reclip_app ping -c 3 8.8.8.8

```

Failure indicates Docker network configuration or host firewall rules blocking egress traffic. Success confirms the container reaches the internet, narrowing the issue to DNS or application-level problems.

### 5. Review Timeout Configuration in app.py

ReClip implements two critical timeouts in [`app.py`](https://github.com/averygan/reclip/blob/main/app.py):

- **Info requests**: 60 seconds at lines [106-107](https://github.com/averygan/reclip/blob/main/app.py#L106-L107)
- **Download requests**: 300 seconds at lines [84-86](https://github.com/averygan/reclip/blob/main/app.py#L84-L86)

Edit these values directly in [`app.py`](https://github.com/averygan/reclip/blob/main/app.py) if your network conditions require longer allowances.

### 6. Enable Verbose yt-dlp Debugging

Modify the `run_download` function at line [36](https://github.com/averygan/reclip/blob/main/app.py#L36) to append diagnostic flags:

```python

# Enhanced debugging version

cmd = ["yt-dlp", "--dump-json", "--verbose", "-f", "best", url]

```

This exposes detailed connection attempts, HTTP headers, and retry behavior.

### 7. Parse Error Responses from API

ReClip unifies error propagation through JSON responses containing an `"error"` key. The front-end at [`templates/index.html`](https://github.com/averygan/reclip/blob/main/templates/index.html) displays `error.message`. Capture these programmatically:

```bash
curl -s -X POST http://localhost:8899/api/info \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com/video"}' | jq .

```

## Reproducing ReClip Network Errors Programmatically

This Python snippet mirrors ReClip's internal logic for isolated testing:

```python
import subprocess
import json

def replicate_reclip_info_call(url: str, timeout: int = 60):
    """
    Replicates the subprocess call from app.py lines 104-108
    """
    cmd = ["yt-dlp", "--no-playlist", "-j", url]
    
    try:
        result = subprocess.run(
            cmd,
            capture_output=True,
            text=True,
            timeout=timeout
        )
        
        if result.returncode != 0:
            # Matches app.py error extraction logic

            error_msg = result.stderr.strip().split("\n")[-1]
            raise RuntimeError(f"yt-dlp failed: {error_msg}")
            
        return json.loads(result.stdout)
        
    except subprocess.TimeoutExpired:
        raise RuntimeError(f"Timed out fetching video info ({timeout}s limit)")

# Test with problematic URL

try:
    info = replicate_reclip_info_call("https://www.youtube.com/watch?v=dQw4w9WgXcQ")
    print(f"Title: {info.get('title')}")
except RuntimeError as e:
    print(f"Network error reproduced: {e}")

```

## Extending ReClip for Resilient Network Operations

For production deployments, consider these modifications to [`app.py`](https://github.com/averygan/reclip/blob/main/app.py):

- **Retry logic**: Wrap `subprocess.run()` with exponential backoff for transient failures
- **Configurable timeouts**: Replace hardcoded values with environment variables
- **Proxy support**: Add optional `--proxy` parameter injection in `run_download`

The current implementation at lines [137-138](https://github.com/averygan/reclip/blob/main/app.py#L137-L138) uses bare `except subprocess.TimeoutExpired` blocks that return generic messages—enhance these to include retry recommendations or alternative format suggestions.

## Summary

- **ReClip network errors propagate from yt-dlp subprocess stderr**, captured in [`app.py`](https://github.com/averygan/reclip/blob/main/app.py) and returned as JSON error responses
- **Three timeout points exist**: 60s for info retrieval, 300s for downloads, both adjustable in [`app.py`](https://github.com/averygan/reclip/blob/main/app.py)
- **Container networking failures** require Docker-level diagnosis—verify with `docker exec` commands before debugging application code
- **Direct yt-dlp testing** inside the container is the fastest validation method for host connectivity issues

## Frequently Asked Questions

### What does "Timed out fetching video info" mean in ReClip?

This error originates from the `subprocess.TimeoutExpired` handler at lines [137-138](https://github.com/averygan/reclip/blob/main/app.py#L137-L138) in [`app.py`](https://github.com/averygan/reclip/blob/main/app.py). The yt-dlp process failed to return video metadata within 60 seconds. Test the same URL with standalone `yt-dlp -j <url>` to determine if the delay is host-side or container-specific.

### How do I increase download timeout limits in ReClip?

Edit the `timeout` parameter in `run_download` at line [84](https://github.com/averygan/reclip/blob/main/app.py#L84) of [`app.py`](https://github.com/averygan/reclip/blob/main/app.py). The default 300 seconds (5 minutes) accommodates most connections but may require extension for large files or bandwidth-constrained environments. Restart the container after modification.

### Why does ReClip work locally but fail in Docker?

Container networking isolation typically causes this discrepancy. Verify [`docker-compose.yml`](https://github.com/averygan/reclip/blob/main/docker-compose.yml) exposes port `8899` correctly, then test outbound connectivity with `docker exec <container> ping 8.8.8.8`. DNS resolution failures inside containers often require custom [`resolv.conf`](https://github.com/averygan/reclip/blob/main/resolv.conf) configuration or Docker daemon DNS settings.

### Where does ReClip store detailed error logs?

ReClip does not implement persistent logging—all errors surface through the API JSON response with the `"error"` key. For forensic analysis, modify [`app.py`](https://github.com/averygan/reclip/blob/main/app.py) to log `result.stderr` before line [108](https://github.com/averygan/reclip/blob/main/app.py#L108) or capture container output with `docker logs -f <container>`.