我有一个HTC MyTouch 3G幻灯片（Android 2.1，API级别7）。我正在尝试编写一个以15fps录制320x240 h.264视频的程序，但我有两个主要问题。对于这两个问题的解决方案，我将不胜感激。这就是我在做的事情：
mediaRecorder = new MediaRecorder();
mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mediaRecorder.setMaxDuration(600000);
mediaRecorder.setOutputFile("/sdcard/test.mp4");
mediaRecorder.setVideoFrameRate(15);
mediaRecorder.setVideoSize(320, 240);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
mediaRecorder.setPreviewDisplay(holder.getSurface());
mediaRecorder.setMaxFileSize(maxFileSizeInBytes);
mediaRecorder.prepare();
mediaRecorder.start();
问题1） H263和MPEG_4_SP工作正常，但H264没有。在调用prepare（）时，logcat充满了以下错误：
E/PackageInstallationReceiver( 209): Remove /data/local/tmp/com.helios.apk Fail!
E/mm-camera 7x-vfe( 2496): Received VFE start ACK!!! This is a user preview start.
E/audio_input( 2496): unsupported parameter: x-pvmf/media-input-node/cap-config-interface;valtype=key_specific_value
E/audio_input( 2496): VerifyAndSetParameter failed
E/CameraInput( 2496): Unsupported parameter(x-pvmf/media-input-node/cap-config-interface;valtype=key_specific_value)
E/CameraInput( 2496): VerifiyAndSetParameter failed on parameter #0
E/PVOMXEncNode( 2496): PVMFOMXEncNode-Audio_AMRNB::DoPrepare(): Got Component OMX.PV.amrencnb handle
E/PVOMXEncNode( 2496): PVMFOMXEncNode-Video_AVC::DoPrepare(): Cannot get component OMX.PV.avcenc handle, try another component if available
E/AuthorDriver( 2496): Command 13 completed with error -17
E/MediaRecorder( 3221): prepare failed: -17
E/Helios ( 3221): prepare failed.
E/AndroidRuntime( 3221): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime( 3221): java.lang.RuntimeException: unlock failed
E/AndroidRuntime( 3221): at android.hardware.Camera.unlock(Native Method)
E/AndroidRuntime( 3221): at com.helios.ActivityLauncher.startRecording(ActivityLauncher.java:268)
E/AndroidRuntime( 3221): at com.helios.ActivityLauncher.onLongClick(ActivityLauncher.java:223)
E/AndroidRuntime( 3221): at com.helios.ActivityLauncher.onClick(ActivityLauncher.java:203)
E/AndroidRuntime( 3221): at android.view.View.performClick(View.java:2361)
E/AndroidRuntime( 3221): at android.view.View.onTouchEvent(View.java:4176)
E/AndroidRuntime( 3221): at android.view.View.dispatchTouchEvent(View.java:3706)
E/AndroidRuntime( 3221): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
E/AndroidRuntime( 3221): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
E/AndroidRuntime( 3221): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
E/AndroidRuntime( 3221): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
E/AndroidRuntime( 3221): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1696)
E/AndroidRuntime( 3221): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1117)
E/AndroidRuntime( 3221): at android.app.Activity.dispatchTouchEvent(Activity.java:2068)
E/AndroidRuntime( 3221): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1680)
E/AndroidRuntime( 3221): at android.view.ViewRoot.handleMessage(ViewRoot.java:1707)
E/AndroidRuntime( 3221): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 3221): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 3221): at android.app.ActivityThread.main(ActivityThread.java:4702)
E/AndroidRuntime( 3221): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 3221): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 3221): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime( 3221): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
E/AndroidRuntime( 3221): at dalvik.system.NativeStart.main(Native Method)
E/dalvikvm( 3221): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
E/JavaBinder( 78): !!! FAILED BINDER TRANSACTION !!!
E/ActivityManager( 78): fail to set top app changed!
E/audio_input( 2496): unsupported parameter: x-pvmf/media-input-node/cap-config-interface;valtype=key_specific_value
E/audio_input( 2496): VerifyAndSetParameter failed
E/CameraInput( 2496): Unsupported parameter(x-pvmf/media-input-node/cap-config-interface;valtype=key_specific_value)
E/CameraInput( 2496): VerifiyAndSetParameter failed on parameter #0
E/CameraService( 2496): getClientFromCookie: client appears to have died
E/mm-camera( 2496): +++ DELETING LEAKED MEMORY AT 0x33f48 (2 REMAINING)
E/mm-camera( 2496): 6 0xa942ba5c
E/mm-camera( 2496): 5 0xa940bfc2
E/mm-camera( 2496): 4 0xa940d774
E/mm-camera( 2496): 3 0xa940d28a
E/mm-camera( 2496): 2 0xafe100c4
E/mm-camera( 2496): 1 0xafe0fb98
E/mm-camera( 2496): +++ DELETING LEAKED MEMORY AT 0x20dc8 (1 REMAINING)
E/mm-camera( 2496): 6 0xa942ba5c
E/mm-camera( 2496): 5 0xa940bfc2
E/mm-camera( 2496): 4 0xa940d774
E/mm-camera( 2496): 3 0xa940d28a
E/mm-camera( 2496): 2 0xafe100c4
E/mm-camera( 2496): 1 0xafe0fb98
使用H.263（有效）时，错误日志仅包含：
E/CameraInput( 58): Unsupported parameter(x-pvmf/media-input-node/cap-config-interface;valtype=key_specific_value)
E/CameraInput( 58): VerifiyAndSetParameter failed on parameter #0
E/PVOMXEncNode( 58): PVMFOMXEncNode-Audio_AMRNB::DoPrepare(): Got Component OMX.PV.amrencnb handle
E/OMXVenc ( 58): component_init::359 Initializing component OMX.qcom.video.encoder.h263
E/PVOMXEncNode( 58): PVMFOMXEncNode-Video_H263::DoPrepare(): Got Component OMX.qcom.video.encoder.h263 handle
E/OMXVenc ( 58): set_parameter::1104 set_parameter : output buffer size = 76800
E/OMXVenc ( 58): set_parameter::1104 set_parameter : output buffer size = 76800
E/OMXVenc ( 58): get_parameter::1007 unsupported index 100663301
E/OMXVenc ( 58): set_parameter::1240 unsupported index 100663301
E/OMXVenc ( 58): get_parameter::1007 unsupported index 100663302
E/OMXVenc ( 58): set_parameter::1240 unsupported index 100663302
E/OMXVenc ( 58): send_command::758 attempt to move to new state 2
E/OMXVenc ( 58): Setting OMX_Video_ControlRateVariable
E/OMXVenc ( 58): use_buffer::1437 client allocated input buffer for component 115200, address= 0x98228
E/OMXVenc ( 58): use_buffer::1437 client allocated input buffer for component 115200, address= 0x98218
E/OMXVenc ( 58): use_buffer::1437 client allocated input buffer for component 115200, address= 0x98208
E/OMXVenc ( 58): use_buffer::1437 client allocated input buffer for component 115200, address= 0x981f8
E/OMXVenc ( 58): allocate_buffer::1577 Attempt to allocate buffer of 76800 bytes for OUTPUT PORT
E/OMXVenc ( 58): allocate_buffer::1577 Attempt to allocate buffer of 76800 bytes for OUTPUT PORT
E/OMXVenc ( 58): allocate_buffer::1577 Attempt to allocate buffer of 76800 bytes for OUTPUT PORT
E/OMXVenc ( 58): allocate_buffer::1577 Attempt to allocate buffer of 76800 bytes for OUTPUT PORT
E/OMXVenc ( 58): send_command::758 attempt to move to new state 2
E/OMXVenc ( 58): process_state_change::2580 Req to Move to Idle: Call venc_stop
E/VENC ( 58): venc_stop::1150 Received command VENC_CMD_STOP
E/VENC_DRV( 58): Reset_HW::344 adsp_rtos_disable
E/OMXVenc ( 58): process_DL_status::2737 got DL status for VENC_CMD_STOP
E/OMXVenc ( 58): process_DL_status::2809 encoder already moves to idle state. call event handler now
E/OMXVenc ( 58): send_command::758 attempt to move to new state 1
E/audio_input( 58): unsupported parameter: x-pvmf/media-input-node/cap-config-interface;valtype=key_specific_value
E/audio_input( 58): VerifyAndSetParameter failed
E/CameraInput( 58): Unsupported parameter(x-pvmf/media-input-node/cap-config-interface;valtype=key_specific_value)
E/CameraInput( 58): VerifiyAndSetParameter failed on parameter #0
E/QCOmxcore( 58): OMXCORE API : Free Handle 93b2c
E/VENC ( 58): venci_process_command_unload::2408 Encoder time taken to Exit from Stop command: 76
E/OMXVenc ( 58): component_deinit::2033 deinitializing component...
E/OMXVenc ( 58): component_deinit::2108 Encoder has exited
E/QCOmxcore( 58): Unloading the dynamic library for OMX.qcom.video.encoder.h263
E/mm-camera( 58): +++ DELETING LEAKED MEMORY AT 0x3fe78 (2 REMAINING)
E/mm-camera( 58): 6 0xa942ba5c
E/mm-camera( 58): 5 0xa940bfc2
E/mm-camera( 58): 4 0xa940d774
E/mm-camera( 58): 3 0xa940d28a
E/mm-camera( 58): 2 0xafe100c4
E/mm-camera( 58): 1 0xafe0fb98
E/mm-camera( 58): +++ DELETING LEAKED MEMORY AT 0x2dd00 (1 REMAINING)
E/mm-camera( 58): 6 0xa942ba5c
E/mm-camera( 58): 5 0xa940bfc2
E/mm-camera( 58): 4 0xa940d774
E/mm-camera( 58): 3 0xa940d28a
E/mm-camera( 58): 2 0xafe100c4
E/mm-camera( 58): 1 0xafe0fb98
问题2）虽然我明确将帧速率设置为15fps，但剪辑的后期分析显示奇怪的帧速率，如21.xx或25.xx fps。
为什么H264无法正常工作，为什么MediaRecorder不能遵守我要求的帧速率？提前谢谢。
答案 0 :(得分：2)
问题1）
无法获得组件OMX.PV.avcenc句柄
您的手机不支持H.264编码。
答案 1 :(得分：1)
只有Android 3.0+支持H.264。
检查CamcorderProfile以了解您的设备支持哪些编码配置文件。