[Libav-user] Question about MediaCodec decoder in FFmpeg

[Zhen Mike]

    Hello.
    I'm using FFmpeg-built-in MediaCodec decoder to decode h264 stream like
this:

```
    AVCodec *codec = avcodec_find_decoder_by_name("h264_mediacodec");
    AVCodecContext *context = avcodec_alloc_context3(codec);
    int ret = avcodec_open2(context, codec, NULL);
    if(ret < 0)
    {
        __android_log_print(ANDROID_LOG_ERROR, "ffmpeg", "fail open
codec.[%d]", ret);
    }
```

    I get the error message. But if I write this way:

```
    AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_H264);
    AVCodecContext *context = avcodec_alloc_context3(codec);
    int ret = avcodec_open2(context, codec, NULL);
    if(ret < 0)
    {
        __android_log_print(ANDROID_LOG_ERROR, "ffmpeg", "fail open
codec.[%d]", ret);
    }
```

    Program runs quite fine. I guess it's about some factors in
AVCodecContext. If so, could you inform me of what these factors are?

    Best wishes!
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