Video/Audio Transcription

import { Parser, KnowledgeCapture } from 'gaik-toolkit';

// For this example, we'll assume you have a transcription service
// You can use services like OpenAI Whisper, Google Speech-to-Text, etc.

class MediaProcessor {
  async extractAudio(videoPath) {
    // Extract audio track from video
    // This would typically use ffmpeg or similar
    console.log(`Extracting audio from ${videoPath}`);

    return {
      audioPath: videoPath.replace(/\.[^.]+$/, '.wav'),
      format: 'wav',
      duration: 0, // Get from metadata
      channels: 2,
      sampleRate: 44100
    };
  }

  async getMediaInfo(filePath) {
    // Get media file information
    return {
      duration: 300, // seconds
      format: 'video/mp4',
      hasAudio: true,
      hasVideo: true
    };
  }
}

class TranscriptionEngine {
  constructor(apiKey) {
    this.apiKey = apiKey;
    // Initialize your transcription service
  }

  async transcribe(audioPath, options = {}) {
    const {
      language = 'en',
      timestamps = true,
      speakers = false
    } = options;

    console.log(`Transcribing ${audioPath}...`);

    // Call transcription service
    // This is a placeholder - integrate with actual service
    const transcript = await this.callTranscriptionService(
      audioPath,
      { language, timestamps, speakers }
    );

    return transcript;
  }

  async callTranscriptionService(audioPath, options) {
    // Placeholder for actual API call
    // In production, use Whisper, Google Speech-to-Text, etc.

    return {
      text: 'Sample transcription text...',
      segments: [
        {
          start: 0,
          end: 5.2,
          text: 'Welcome to this video.',
          confidence: 0.98
        },
        {
          start: 5.2,
          end: 10.5,
          text: 'Today we will discuss...',
          confidence: 0.95
        }
      ],
      language: options.language,
      duration: 300
    };
  }

  async transcribeWithSpeakers(audioPath) {
    // Transcribe with speaker identification
    return await this.transcribe(audioPath, {
      speakers: true
    });
  }
}

class VideoTranscriptionSystem {
  constructor(apiKey) {
    this.processor = new MediaProcessor();
    this.transcriber = new TranscriptionEngine(apiKey);
    this.parser = new Parser();
    this.capture = new KnowledgeCapture();
  }

  async transcribeVideo(videoPath, options = {}) {
    try {
      // Get media info
      const info = await this.processor.getMediaInfo(videoPath);

      // Extract audio if it's a video
      let audioPath = videoPath;
      if (info.hasVideo) {
        const audioInfo = await this.processor.extractAudio(videoPath);
        audioPath = audioInfo.audioPath;
      }

      // Transcribe
      const transcript = await this.transcriber.transcribe(
        audioPath,
        options
      );

      // Process with GAIK
      const knowledge = await this.processTranscript(transcript);

      return {
        source: videoPath,
        transcript: transcript,
        knowledge: knowledge,
        metadata: info,
        processedAt: new Date().toISOString()
      };
    } catch (error) {
      console.error('Transcription failed:', error);
      throw error;
    }
  }

  async processTranscript(transcript) {
    // Use Knowledge Capture to extract entities and concepts
    const knowledge = await this.capture.captureFromText(
      transcript.text
    );

    return {
      ...knowledge,
      segments: transcript.segments,
      summary: this.generateSummary(transcript.segments)
    };
  }

  generateSummary(segments) {
    // Generate a summary from segments
    const sentences = segments.map(s => s.text).slice(0, 5);
    return sentences.join(' ');
  }

  async transcribeBatch(filePaths, options = {}) {
    const results = await Promise.all(
      filePaths.map(path =>
        this.transcribeVideo(path, options)
      )
    );
    return results;
  }
}

// Initialize system
const apiKey = 'your-transcription-api-key';
const transcription = new VideoTranscriptionSystem(apiKey);

// Transcribe single video
async function transcribeSingleVideo() {
  const result = await transcription.transcribeVideo(
    'path/to/video.mp4',
    {
      language: 'en',
      timestamps: true,
      speakers: false
    }
  );

  console.log('Transcript:', result.transcript.text);
  console.log('Entities:', result.knowledge.entities);
  console.log('Concepts:', result.knowledge.concepts);

  return result;
}

// Transcribe multiple videos
async function transcribeMultipleVideos() {
  const videos = [
    'video1.mp4',
    'video2.mp4',
    'video3.mp4'
  ];

  const results = await transcription.transcribeBatch(videos);

  results.forEach((result, index) => {
    console.log(`Video ${index + 1}:`);
    console.log('Duration:', result.metadata.duration);
    console.log('Summary:', result.knowledge.summary);
  });

  return results;
}

// Run
transcribeSingleVideo();

class SubtitleGenerator {
  generateSRT(transcript) {
    let srt = '';

    transcript.segments.forEach((segment, index) => {
      srt += `${index + 1}\n`;
      srt += `${this.formatTime(segment.start)} --> ${this.formatTime(segment.end)}\n`;
      srt += `${segment.text}\n\n`;
    });

    return srt;
  }

  formatTime(seconds) {
    const hours = Math.floor(seconds / 3600);
    const minutes = Math.floor((seconds % 3600) / 60);
    const secs = Math.floor(seconds % 60);
    const ms = Math.floor((seconds % 1) * 1000);

    return `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}:${String(secs).padStart(2, '0')},${String(ms).padStart(3, '0')}`;
  }

  generateVTT(transcript) {
    let vtt = 'WEBVTT\n\n';

    transcript.segments.forEach((segment, index) => {
      vtt += `${index + 1}\n`;
      vtt += `${this.formatTimeVTT(segment.start)} --> ${this.formatTimeVTT(segment.end)}\n`;
      vtt += `${segment.text}\n\n`;
    });

    return vtt;
  }

  formatTimeVTT(seconds) {
    const time = this.formatTime(seconds);
    return time.replace(',', '.');
  }
}

// Usage
const subtitleGen = new SubtitleGenerator();
const srt = subtitleGen.generateSRT(transcript);
const vtt = subtitleGen.generateVTT(transcript);

class VideoTranscriptionSystem {
  // ... previous methods ...

  async transcribeWithSpeakers(videoPath) {
    const result = await this.transcribeVideo(videoPath, {
      speakers: true
    });

    // Group by speaker
    const bySpeaker = this.groupBySpeaker(result.transcript.segments);

    return {
      ...result,
      speakers: bySpeaker
    };
  }

  groupBySpeaker(segments) {
    const speakers = {};

    segments.forEach(segment => {
      const speaker = segment.speaker || 'Unknown';

      if (!speakers[speaker]) {
        speakers[speaker] = {
          segments: [],
          totalDuration: 0,
          wordCount: 0
        };
      }

      speakers[speaker].segments.push(segment);
      speakers[speaker].totalDuration += segment.end - segment.start;
      speakers[speaker].wordCount += segment.text.split(' ').length;
    });

    return speakers;
  }
}

import { KnowledgeExtraction } from 'gaik-toolkit';

class TranscriptAnalyzer {
  constructor() {
    this.extractor = new KnowledgeExtraction({
      queryMode: 'semantic'
    });
  }

  async analyze(transcriptionResult) {
    const knowledge = transcriptionResult.knowledge;

    // Extract key topics
    const topics = await this.extractor.extract(
      knowledge,
      'What are the main topics discussed?'
    );

    // Extract action items
    const actions = await this.extractor.extract(
      knowledge,
      'List any action items or tasks mentioned'
    );

    // Extract people mentioned
    const people = await this.extractor.extract(
      knowledge,
      'Who are the people mentioned?'
    );

    return {
      topics: topics.results,
      actions: actions.results,
      people: people.results,
      summary: knowledge.summary
    };
  }
}

// Usage
const analyzer = new TranscriptAnalyzer();
const analysis = await analyzer.analyze(transcriptionResult);
console.log('Key Topics:', analysis.topics);
console.log('Action Items:', analysis.actions);

class RealtimeTranscriber {
  constructor(apiKey) {
    this.transcriber = new TranscriptionEngine(apiKey);
    this.buffer = [];
    this.callbacks = [];
  }

  startStream(audioStream) {
    audioStream.on('data', chunk => {
      this.buffer.push(chunk);

      if (this.buffer.length >= 10) { // Process every 10 chunks
        this.processBuffer();
      }
    });
  }

  async processBuffer() {
    const audio = Buffer.concat(this.buffer);
    this.buffer = [];

    try {
      const result = await this.transcriber.transcribe(audio);

      // Notify listeners
      this.callbacks.forEach(cb => cb(result));
    } catch (error) {
      console.error('Real-time transcription error:', error);
    }
  }

  onTranscript(callback) {
    this.callbacks.push(callback);
  }
}

// Usage
const realtime = new RealtimeTranscriber(apiKey);
realtime.onTranscript(transcript => {
  console.log('Live:', transcript.text);
});

realtime.startStream(audioStream);

class BatchProcessor {
  constructor(transcriptionSystem) {
    this.system = transcriptionSystem;
    this.queue = [];
    this.processing = false;
    this.maxConcurrent = 3;
  }

  async addToQueue(filePath, options = {}) {
    this.queue.push({ filePath, options });

    if (!this.processing) {
      this.processQueue();
    }
  }

  async processQueue() {
    this.processing = true;

    while (this.queue.length > 0) {
      const batch = this.queue.splice(0, this.maxConcurrent);

      await Promise.all(
        batch.map(item =>
          this.processFile(item.filePath, item.options)
        )
      );
    }

    this.processing = false;
  }

  async processFile(filePath, options) {
    try {
      console.log(`Processing: ${filePath}`);
      const result = await this.system.transcribeVideo(
        filePath,
        options
      );

      await this.saveResult(result);
      console.log(`Completed: ${filePath}`);
    } catch (error) {
      console.error(`Failed: ${filePath}`, error);
    }
  }

  async saveResult(result) {
    // Save to database or file system
    const filename = `transcript_${Date.now()}.json`;
    // Implementation depends on your storage
  }
}

{
  "source": "video.mp4",
  "transcript": {
    "text": "Complete transcription text...",
    "segments": [
      {
        "start": 0,
        "end": 5.2,
        "text": "Welcome to this video.",
        "confidence": 0.98,
        "speaker": "Speaker 1"
      }
    ],
    "language": "en",
    "duration": 300
  },
  "knowledge": {
    "entities": [...],
    "concepts": [...],
    "summary": "This video discusses..."
  },
  "metadata": {
    "duration": 300,
    "format": "video/mp4"
  },
  "processedAt": "2024-03-15T10:30:00Z"
}