-19 android runtime_error ai_generated true

java.lang.RuntimeException: start failed. E/MediaRecorder: start failed: -19

ID: android/media-recorder-start-failed

Also available as: JSON · Markdown · 中文
85%Fix Rate
85%Confidence
1Evidence
2023-02-28First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Android 12 (API 31) active — — —
Android 13 (API 33) active — — —

Root Cause

MediaRecorder cannot start due to missing audio/video source permissions, invalid output file path, or unsupported encoder/format combination.

generic

中文

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。

Official Documentation

https://developer.android.com/reference/android/media/MediaRecorder

Workarounds

  1. 85% success 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. 
    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.
  2. 90% success 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()); 
    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());
  3. 85% success Set the audio and video encoders to supported values. Example: mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); 
    Set the audio and video encoders to supported values. Example: mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);

中文步骤

  1. 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。
  2. 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());
  3. 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);

Dead Ends

Common approaches that don't work:

  1. 75% fail

    Video recording with audio requires both CAMERA and RECORD_AUDIO permissions; missing audio permission causes start failure.

  2. 80% fail

    MediaRecorder requires a writable file path; using a non-writable location leads to error -19.

  3. 70% fail

    Not all devices support H.265; falling back to H.264 is safer but the error persists if not handled.