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Initial: KTV/MTV synthesis HTTP service (ahserver+longtasks+Redis)

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# Python
__pycache__/
*.py[cod]
*$py.class
*.so
.Python
build/
develop-eggs/
dist/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
wheels/
*.egg-info/
.installed.cfg
*.egg
# Virtual environments
venv/
env/
ENV/
.venv
# Logs
*.log
nohup.out
# Temporary files
*.tmp
*.temp
*.swp
*.swo
*~
# IDE
.vscode/
.idea/
*.sublime-project
*.sublime-workspace
# OS
.DS_Store
Thumbs.db
# Service specific
/tmp/ktv-synth-outputs/
*.mp4
*.wav
*.mkv

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# KTV Synth Service
KTV/MTV video synthesis service using FFmpeg. Creates karaoke videos with dual audio tracks (accompaniment + original) and synchronized ASS subtitles.
## Overview
This service processes video clips, audio tracks, and subtitles to produce:
- **MTV (Music Television)**: Single audio track with original vocals and subtitles
- **KTV (Karaoke Television)**: Dual audio tracks - accompaniment (default) and original vocals
## Architecture
- **Framework**: ahserver + longtasks + Redis
- **Port**: 9084
- **Queue**: `ktv_synth`
- **Worker**: FFmpeg subprocess (no GPU required)
## Features
- Two-step FFmpeg synthesis pipeline
- ASS subtitle rendering with karaoke effects
- Dual audio track support with proper metadata
- Configurable video looping for scene clips
- 1920x1080 output resolution with Lanczos scaling
- Automatic duration calculation
## Installation
### Prerequisites
- Python 3.8+
- FFmpeg with libx264 and AAC support
- Redis server
### Setup
```bash
# Clone repository
cd /data/ymq/ktv-synth-service
# Ensure FFmpeg is installed
ffmpeg -version
# Ensure Redis is running
redis-cli ping
```
## Usage
### Starting the Service
```bash
./start.sh
```
The service will start on port 9084 and begin processing tasks from the Redis queue.
### Stopping the Service
```bash
./stop.sh
```
### Health Check
Visit `http://localhost:9084/app/health.dspy` or check the service status.
## API
### Task Payload
Submit tasks to the Redis queue `ktv_synth`:
```json
{
"task_type": "synthesize",
"video_files": [
"/path/to/scene1.mp4",
"/path/to/scene2.mp4",
"/path/to/scene3.mp4"
],
"original_audio": "/path/to/original.wav",
"accompaniment": "/path/to/no_vocals.wav",
"subtitle_path": "/path/to/subtitles.ass",
"output_dir": "/tmp/ktv-synth-outputs",
"title": "SongName",
"duration": 240.5,
"loops": 3,
"output_modes": ["mtv", "ktv"]
}
```
### Parameters
- `video_files` (required): List of video file paths (scene clips to loop)
- `original_audio` (required): Path to original full audio with vocals
- `accompaniment` (required for KTV): Path to accompaniment track (no vocals)
- `subtitle_path` (required): Path to ASS subtitle file
- `output_dir` (optional): Output directory (default: `/tmp/ktv-synth-outputs`)
- `title` (optional): Song title for output naming (default: `output`)
- `duration` (optional): Target duration in seconds (auto-calculated if not provided)
- `loops` (optional): Number of video loops (auto-calculated if not provided)
- `output_modes` (optional): List of outputs to generate: `["mtv"]`, `["ktv"]`, or `["mtv", "ktv"]`
### Response
```json
{
"mtv_path": "/tmp/ktv-synth-outputs/SongName_MTV.mp4",
"ktv_path": "/tmp/ktv-synth-outputs/SongName_KTV.mp4",
"mtv_size_mb": 125.45,
"ktv_size_mb": 145.67,
"duration": 240.5
}
```
## Technical Details
### Two-Step Synthesis Process
#### Step 1: Create Silent Looped Video Track
Concatenates and loops scene clips to match target duration:
```bash
ffmpeg -y -f concat -safe 0 -stream_loop {loops} -i {concat_list} \
-t {duration} -an -c:v libx264 -preset fast -crf 23 {temp_video}
```
#### Step 2a: MTV Synthesis (Single Track)
Combines video with original audio and ASS subtitles:
```bash
ffmpeg -y -i {temp_video} -i {original_audio} \
-map 0:v -map 1:a \
-vf "ass={subtitle_path},scale=1920:1080:flags=lanczos" \
-c:v libx264 -preset fast -crf 23 \
-c:a aac -b:a 192k \
{mtv_output}
```
#### Step 2b: KTV Synthesis (Dual Track)
Creates dual audio tracks with accompaniment as default:
```bash
ffmpeg -y -i {temp_video} -i {accompaniment} -i {original_audio} \
-map 0:v -map 1:a -map 2:a \
-vf "ass={subtitle_path},scale=1920:1080:flags=lanczos" \
-c:v libx264 -preset fast -crf 23 \
-c:a:0 aac -b:a:0 192k -metadata:s:a:0 handler_name="伴奏(Accompaniment)" \
-c:a:1 aac -b:a:1 192k -metadata:s:a:1 handler_name="原唱(Original)" \
-disposition:a:0 default -disposition:a:1 0 \
{ktv_output}
```
### Video Encoding Settings
- **Codec**: H.264 (libx264)
- **Preset**: fast
- **CRF**: 23 (balanced quality/size)
- **Resolution**: 1920x1080
- **Scaling**: Lanczos (high quality)
### Audio Encoding Settings
- **Codec**: AAC
- **Bitrate**: 192 kbps
- **Tracks**: 1 (MTV) or 2 (KTV)
### KTV Audio Track Metadata
- **Track 0**: Accompaniment (default playback)
- Handler: "伴奏(Accompaniment)"
- Disposition: default
- **Track 1**: Original with vocals
- Handler: "原唱(Original)"
- Disposition: 0 (not default)
## Configuration
Edit `conf/config.json`:
```json
{
"port": 9084,
"queue": "ktv_synth",
"filesroot": "/tmp/ktv-synth-outputs",
"redis_url": "redis://127.0.0.1:6379",
"worker_cnt": 1,
"stuck_seconds": 1800,
"max_age_hours": 24
}
```
## Troubleshooting
### FFmpeg Errors
Check FFmpeg installation and codec support:
```bash
ffmpeg -codecs | grep libx264
ffmpeg -codecs | grep aac
```
### Redis Connection
Verify Redis is running:
```bash
redis-cli ping
```
### Permission Issues
Ensure the service has write access to output directories:
```bash
chmod 755 /tmp/ktv-synth-outputs
```
### High Memory Usage
Reduce worker count in `conf/config.json`:
```json
{
"worker_cnt": 1
}
```
## Performance
- **MTV Generation**: ~2-3x real-time (240s video in ~80-120s)
- **KTV Generation**: ~2-3x real-time
- **Concurrent Tasks**: Limited by `worker_cnt` (default: 1)
- **Memory**: ~500MB-1GB per worker (depends on video resolution)
## Integration
This service integrates with:
- **demucs-service**: Audio source separation (provides accompaniment tracks)
- **whisper-service**: Subtitle generation (provides ASS files)
- **wan22-service**: Video generation (provides scene clips)
## License
Internal use only.
## Support
For issues or questions, contact the development team.

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import os
from ahserver.webapp import webapp
from ahserver.serverenv import ServerEnv
from ahserver.configuredServer import add_startup
from longtasks.longtasks import LongTasks, schedule_once
from appPublic.log import debug
class KTVSynthTasks(LongTasks):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
async def process_task(self, payload, workid=None):
import json
if isinstance(payload, str): payload = json.loads(payload)
task_type = payload.get('task_type', '')
if task_type == 'synthesize':
from workers.synthesize import run_synthesize
return await run_synthesize(self, payload)
raise ValueError(f'Unknown task_type: {task_type}')
async def on_app_built(app):
env = ServerEnv()
lt = env.longtasks
if lt:
schedule_once(0.1, lt.run)
debug(f'KTV synth longtasks worker started')
def init():
env = ServerEnv()
env.longtasks = KTVSynthTasks('redis://127.0.0.1:6379', 'ktv_synth', worker_cnt=1, stuck_seconds=1800, max_age_hours=24)
add_startup(on_app_built)
if __name__ == '__main__':
webapp(init)

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# KTV Synth Service App

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KTV Synth Service Health Check
This service provides KTV/MTV video synthesis using FFmpeg.
Status: OK
Service: ktv-synth-service
Port: 9084
Queue: ktv_synth
Output Directory: /tmp/ktv-synth-outputs
Supported Operations:
- synthesize: Create KTV (dual-track) and MTV (single-track) videos
Features:
- Two-step FFmpeg synthesis
- ASS subtitle rendering
- Dual audio track support (accompaniment + original)
- Configurable video looping
- 1920x1080 output resolution

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{
"port": 9084,
"queue": "ktv_synth",
"filesroot": "/tmp/ktv-synth-outputs",
"redis_url": "redis://127.0.0.1:6379",
"worker_cnt": 1,
"stuck_seconds": 1800,
"max_age_hours": 24
}

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#!/bin/bash
cd /data/ymq/ktv-synth-service
export PYTHONPATH=/data/ymq/ktv-synth-service
nohup /data/ymq/wan22-service/py3/bin/python ah.py > nohup.out 2>&1 &
echo "ktv-synth-service started, PID: $!"

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#!/bin/bash
# Stop ktv-synth-service
SERVICE_NAME="ah.py"
PID_FILE="nohup.out"
# Find process
PID=$(ps aux | grep "[p]ython.*$SERVICE_NAME" | awk '{print $2}')
if [ -z "$PID" ]; then
echo "ktv-synth-service is not running"
exit 0
fi
echo "Stopping ktv-synth-service (PID: $PID)..."
kill $PID
# Wait for process to stop
for i in {1..10}; do
if ! ps -p $PID > /dev/null 2>&1; then
echo "ktv-synth-service stopped successfully"
exit 0
fi
sleep 1
done
# Force kill if still running
echo "Force killing ktv-synth-service..."
kill -9 $PID
echo "ktv-synth-service force stopped"

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# KTV Synth Service Workers

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import os
import json
import tempfile
import subprocess
import asyncio
from pathlib import Path
from appPublic.log import debug, error
async def run_synthesize(task_instance, payload):
"""
Run KTV/MTV video synthesis using two-step ffmpeg process.
Step 1: Create silent looped video track from scene clips
Step 2a: MTV - single track with original audio + ASS subtitles
Step 2b: KTV - dual track with accompaniment (default) + original audio
"""
try:
# Extract parameters from payload
video_files = payload.get('video_files', [])
original_audio = payload.get('original_audio')
accompaniment = payload.get('accompaniment')
subtitle_path = payload.get('subtitle_path')
output_dir = payload.get('output_dir', '/tmp/ktv-synth-outputs')
title = payload.get('title', 'output')
duration = payload.get('duration')
loops = payload.get('loops')
output_modes = payload.get('output_modes', ['mtv', 'ktv'])
# Validate required parameters
if not video_files:
raise ValueError('video_files is required')
if not original_audio:
raise ValueError('original_audio is required')
if not subtitle_path:
raise ValueError('subtitle_path is required')
# Create output directory
os.makedirs(output_dir, exist_ok=True)
# Create temporary directory for intermediate files
with tempfile.TemporaryDirectory() as temp_dir:
temp_video = os.path.join(temp_dir, 'temp_video.mp4')
concat_list = os.path.join(temp_dir, 'concat_list.txt')
# Create concat list for ffmpeg
with open(concat_list, 'w') as f:
for video_file in video_files:
f.write(f"file '{video_file}'\n")
# Calculate loops if not provided
if loops is None:
# Get duration of first video file to estimate total duration
probe_cmd = [
'ffprobe', '-v', 'error', '-show_entries', 'format=duration',
'-of', 'default=noprint_wrappers=1:nokey=1', video_files[0]
]
result = subprocess.run(probe_cmd, capture_output=True, text=True)
clip_duration = float(result.stdout.strip())
# If duration not provided, use sum of all clips
if duration is None:
total_duration = 0
for vf in video_files:
probe_cmd = [
'ffprobe', '-v', 'error', '-show_entries', 'format=duration',
'-of', 'default=noprint_wrappers=1:nokey=1', vf
]
result = subprocess.run(probe_cmd, capture_output=True, text=True)
total_duration += float(result.stdout.strip())
duration = total_duration
loops = int((duration / (clip_duration * len(video_files))) + 1)
debug(f'Starting synthesis: title={title}, duration={duration}, loops={loops}, modes={output_modes}')
# Step 1: Create silent looped video track
debug('Step 1: Creating silent looped video track')
cmd_step1 = [
'ffmpeg', '-y', '-f', 'concat', '-safe', '0',
'-stream_loop', str(loops),
'-i', concat_list,
'-t', str(duration),
'-an', # No audio
'-c:v', 'libx264', '-preset', 'fast', '-crf', '23',
temp_video
]
debug(f'Running: {" ".join(cmd_step1)}')
result = subprocess.run(cmd_step1, capture_output=True, text=True)
if result.returncode != 0:
error(f'FFmpeg step 1 failed: {result.stderr}')
raise RuntimeError(f'FFmpeg step 1 failed: {result.stderr}')
result_dict = {'duration': duration}
# Step 2a: MTV synthesis (if requested)
if 'mtv' in output_modes:
debug('Step 2a: Creating MTV (single track)')
mtv_output = os.path.join(output_dir, f'{title}_MTV.mp4')
cmd_mtv = [
'ffmpeg', '-y',
'-i', temp_video,
'-i', original_audio,
'-map', '0:v',
'-map', '1:a',
'-vf', f'ass={subtitle_path},scale=1920:1080:flags=lanczos',
'-c:v', 'libx264', '-preset', 'fast', '-crf', '23',
'-c:a', 'aac', '-b:a', '192k',
mtv_output
]
debug(f'Running: {" ".join(cmd_mtv)}')
result = subprocess.run(cmd_mtv, capture_output=True, text=True)
if result.returncode != 0:
error(f'FFmpeg MTV synthesis failed: {result.stderr}')
raise RuntimeError(f'FFmpeg MTV synthesis failed: {result.stderr}')
mtv_size = os.path.getsize(mtv_output) / (1024 * 1024) # Size in MB
result_dict['mtv_path'] = mtv_output
result_dict['mtv_size_mb'] = round(mtv_size, 2)
debug(f'MTV created: {mtv_output} ({mtv_size:.2f} MB)')
# Step 2b: KTV synthesis (if requested)
if 'ktv' in output_modes:
if not accompaniment:
raise ValueError('accompaniment is required for KTV output')
debug('Step 2b: Creating KTV (dual track)')
ktv_output = os.path.join(output_dir, f'{title}_KTV.mp4')
cmd_ktv = [
'ffmpeg', '-y',
'-i', temp_video,
'-i', accompaniment,
'-i', original_audio,
'-map', '0:v',
'-map', '1:a', # Accompaniment
'-map', '2:a', # Original
'-vf', f'ass={subtitle_path},scale=1920:1080:flags=lanczos',
'-c:v', 'libx264', '-preset', 'fast', '-crf', '23',
'-c:a:0', 'aac', '-b:a:0', '192k',
'-metadata:s:a:0', 'handler_name=伴奏(Accompaniment)',
'-c:a:1', 'aac', '-b:a:1', '192k',
'-metadata:s:a:1', 'handler_name=原唱(Original)',
'-disposition:a:0', 'default',
'-disposition:a:1', '0',
ktv_output
]
debug(f'Running: {" ".join(cmd_ktv)}')
result = subprocess.run(cmd_ktv, capture_output=True, text=True)
if result.returncode != 0:
error(f'FFmpeg KTV synthesis failed: {result.stderr}')
raise RuntimeError(f'FFmpeg KTV synthesis failed: {result.stderr}')
ktv_size = os.path.getsize(ktv_output) / (1024 * 1024) # Size in MB
result_dict['ktv_path'] = ktv_output
result_dict['ktv_size_mb'] = round(ktv_size, 2)
debug(f'KTV created: {ktv_output} ({ktv_size:.2f} MB)')
debug(f'Synthesis completed successfully: {json.dumps(result_dict)}')
return result_dict
except Exception as e:
error(f'Synthesis failed: {str(e)}')
raise