Android 无法实例化编解码器 'video/avc'

Question

这是我的第一篇文章，所以请耐心等待。

我正在尝试在 Android 应用程序中的 Surface 对象上播放原始 h264 视频。我在 HTC 上使用 android 5.0.1。阅读完 android 文档后，我发现我需要使用 MediaCodec 对象来解码原始字节，然后将它们释放到 Surface。我已经查阅了大量其他问题和文档，但还没有找到我看似非常简单的问题的答案。这是我的代码 fragment :

        @Override
        public void surfaceCreated(SurfaceHolder surfHolder) {
            try {
                String codecType = "video/avc";
                MediaFormat mf = MediaFormat.createVideoFormat(codecType, 45 ,45);
                mc = MediaCodec.createByCodecName(codecType);
                mc.configure(mf, surfHolder.getSurface(), null, 0);
                mc.setCallback(vcb);
                mc.start();
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }

但是，当它尝试按名称创建编解码器时，我遇到了困难，并且收到此错误:

08-26 18:09:02.054    9132-9132/com.james.firstclient I/InputMethodManager﹕ [startInputInner] EditorInfo { packageName=com.james.firstclient, inputType=0x20001, imeOptions=0x48000005, privateImeOptions=null }, windowGainingFocus=android.view.ViewRootImpl$W@37cf53de, mServedView=android.widget.EditText{2a8889bf VFED..CL .F....I. 48,177-1032,290 #7f080001 app:id/hostText}, mServedInputConnectionWrapper=android.view.inputmethod.InputMethodManager$ControlledInputConnectionWrapper@3ed5088c
08-26 18:09:03.964    9132-9292/com.james.firstclient D/libc﹕ [NET] android_getaddrinfofornet+,hn 12(0x3139322e313638),sn(),hints(known),family 0,flags 4
08-26 18:09:03.964    9132-9292/com.james.firstclient D/libc﹕ [NET] android_getaddrinfofornet-, SUCCESS
08-26 18:09:04.094    9132-9298/com.james.firstclient W/ACodec﹕ Allocating component 'video/avc' failed, try next one.
08-26 18:09:04.094    9132-9298/com.james.firstclient E/ACodec﹕ Unable to instantiate codec 'video/avc'.
08-26 18:09:04.094    9132-9298/com.james.firstclient E/ACodec﹕ signalError(omxError 0x80001003, internalError -2147483648)
08-26 18:09:04.094    9132-9298/com.james.firstclient E/MediaCodec﹕ Codec reported err 0xfffffffe, actionCode 0, while in state 1
08-26 18:09:04.094    9132-9132/com.james.firstclient W/MediaCodec-JNI﹕ try to release MediaCodec from JMediaCodec::~JMediaCodec()...
08-26 18:09:04.094    9132-9132/com.james.firstclient W/MediaCodec-JNI﹕ done releasing MediaCodec from JMediaCodec::~JMediaCodec().
08-26 18:09:04.094    9132-9132/com.james.firstclient W/System.err﹕ java.lang.IllegalArgumentException: Failed to initialize video/avc, error 0xfffffffe
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.media.MediaCodec.native_setup(Native Method)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.media.MediaCodec.<init>(MediaCodec.java:486)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.media.MediaCodec.createByCodecName(MediaCodec.java:470)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at com.james.firstclient.WatchVideoActivity.surfaceCreated(WatchVideoActivity.java:63)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.SurfaceView.updateWindow(SurfaceView.java:579)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:176)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:847)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2050)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1106)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6018)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.Choreographer$CallbackRecord.run(Choreographer.java:792)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.Choreographer.doCallbacks(Choreographer.java:596)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.Choreographer.doFrame(Choreographer.java:557)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:778)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:739)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.os.Looper.loop(Looper.java:155)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5696)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
08-26 18:09:04.114    9132-9132/com.james.firstclient W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)

有大量关于实例化 MediaCodec 对象后要做什么的信息，但基本上没有(从我能找到的)关于这种情况下发生的情况的信息。这让我希望这只是一个愚蠢的错误。有人知道吗？

提前致谢。

Answer 1

使用createDecoderByType而不是createByCodecName。