我有以下代码：
Log.i("xx","A");
media_recorder = new MediaRecorder();
Log.i("xx","B");
media_recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
Log.i("xx","C");
media_recorder.setoutputFormat(MediaRecorder.OutputFormat.MPEG_4);
Log.i("xx","D");
media_recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
Log.i("xx","E");
media_recorder.setVideoSize(320,240);
Log.i("xx","F");
media_recorder.setVideoFrameRate(15);
Log.i("xx","G");
CamcorderProfile profile = CamcorderProfile.get(CameraInfo.CAMERA_FACING_FRONT,CamcorderProfile.QUALITY_LOW);
Log.i("xx","H");
media_recorder.setProfile(profile);
Log.i("xx","I");
media_recorder.setoutputFile(fname);
代码执行后,我在日志中看到以下内容;
02-07 16:12:47.628: I/xx(15436): A 02-07 16:12:47.628: I/xx(15436): B 02-07 16:12:47.638: I/xx(15436): C 02-07 16:12:47.638: I/xx(15436): D 02-07 16:12:47.638: I/xx(15436): E 02-07 16:12:47.638: I/xx(15436): F 02-07 16:12:47.638: I/xx(15436): G 02-07 16:12:47.638: I/xx(15436): H 02-07 16:12:47.638: E/MediaRecorder(15436): setoutputFormat called in an invalid state: 4
这让我很困惑,因为对setoutputFormat的调用是在“C”和“D”之间进行的,但错误的报告似乎是在H之后(永远不会达到“I”).所以现在我不知道导致错误的原因,我对错误发生的地方感到困惑.
编辑：我刚刚调试了调试器中的代码 – 确实在调用setProfile(profile)期间发生了错误…所以看起来调用setoutputFormat(在“C”和“D”之间)一定工作正常,但是setProfile本身必须再次调用setoutputFormat然后失败…是什么发生了？
编辑：无效状态4实际上意味着什么？是否有某些列表告诉您每个可能的无效状态号1,2,3,4等的含义？
解决方法
这是setProfile方法的源代码：
public void setProfile(CamcorderProfile profile) {
setoutputFormat(profile.fileFormat);
setVideoFrameRate(profile.videoFrameRate);
setVideoSize(profile.videoFrameWidth,profile.videoFrameHeight);
setVideoEncodingBitRate(profile.videoBitRate);
setVideoEncoder(profile.videoCodec);
if (profile.quality >= CamcorderProfile.QUALITY_TIME_LAPSE_LOW &&
profile.quality <= CamcorderProfile.QUALITY_TIME_LAPSE_QVGA) {
// nothing needs to be done. Call to setCaptureRate() enables
// time lapse video recording.
} else {
setAudioEncodingBitRate(profile.audioBitRate);
setAudioChannels(profile.audioChannels);
setAudioSamplingRate(profile.audioSampleRate);
setAudioEncoder(profile.audioCodec);
}
}
例如.它将outputFormat,videoSize,encoder和frameRate设置为profile中的值.所以你的代码：
Log.i("xx","C");
media_recorder.setoutputFormat(MediaRecorder.OutputFormat.MPEG_4);
Log.i("xx","D");
media_recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
Log.i("xx","E");
media_recorder.setVideoSize(320,"F");
media_recorder.setVideoFrameRate(15);
至少是无用的,也许在这些调用期间它会改变状态.试试没有它.