{
  "id": "android/media-recorder-start-failed",
  "signature": "java.lang.RuntimeException: start failed. E/MediaRecorder: start failed: -19",
  "signature_zh": "java.lang.RuntimeException：启动失败。E/MediaRecorder：启动失败：-19",
  "regex": "java\\.lang\\.RuntimeException: start failed\\. E/MediaRecorder: start failed: -19",
  "domain": "android",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "MediaRecorder cannot start due to missing audio/video source permissions, invalid output file path, or unsupported encoder/format combination.",
  "root_cause_type": "generic",
  "root_cause_zh": "MediaRecorder 由于缺少音频/视频源权限、输出文件路径无效或编码器/格式组合不受支持而无法启动。",
  "versions": [
    {
      "version": "Android 12 (API 31)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Android 13 (API 33)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Video recording with audio requires both CAMERA and RECORD_AUDIO permissions; missing audio permission causes start failure.",
      "fail_rate": 0.75,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "MediaRecorder requires a writable file path; using a non-writable location leads to error -19.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Not all devices support H.265; falling back to H.264 is safer but the error persists if not handled.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Ensure all required permissions are granted: add <uses-permission android:name=\"android.permission.RECORD_AUDIO\" /> and <uses-permission android:name=\"android.permission.CAMERA\" /> in AndroidManifest.xml, and request them at runtime.",
      "success_rate": 0.85,
      "how": "Ensure all required permissions are granted: add <uses-permission android:name=\"android.permission.RECORD_AUDIO\" /> and <uses-permission android:name=\"android.permission.CAMERA\" /> in AndroidManifest.xml, and request them at runtime.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Use a valid output file path in the app's external cache directory. Example: File outputFile = new File(context.getExternalCacheDir(), \"recording.mp4\"); mediaRecorder.setOutputFile(outputFile.getAbsolutePath());",
      "success_rate": 0.9,
      "how": "Use a valid output file path in the app's external cache directory. Example: File outputFile = new File(context.getExternalCacheDir(), \"recording.mp4\"); mediaRecorder.setOutputFile(outputFile.getAbsolutePath());",
      "condition": "",
      "sources": []
    },
    {
      "action": "Set the audio and video encoders to supported values. Example: mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);",
      "success_rate": 0.85,
      "how": "Set the audio and video encoders to supported values. Example: mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "确保已授予所有必要权限：在 AndroidManifest.xml 中添加 <uses-permission android:name=\"android.permission.RECORD_AUDIO\" /> 和 <uses-permission android:name=\"android.permission.CAMERA\" />，并在运行时请求。",
    "使用应用程序外部缓存目录中的有效输出文件路径。示例：File outputFile = new File(context.getExternalCacheDir(), \"recording.mp4\"); mediaRecorder.setOutputFile(outputFile.getAbsolutePath());",
    "将音频和视频编码器设置为支持的值。示例：mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://developer.android.com/reference/android/media/MediaRecorder",
  "official_doc_section": null,
  "error_code": "-19",
  "verification_tier": "ai_generated",
  "confidence": 0.85,
  "fix_success_rate": 0.85,
  "resolvable": "true",
  "first_seen": "2023-02-28",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}