Android通过JNI调用ffmpeg实现解码，avcodec_open2返回错误代码-22

JNIEXPORT int JNICALL Java_com_example_testlive_MainActivity_Init( JNIEnv* env, jobject thiz)

{

	//avcodec_init();

	avcodec_register_all();

	// Register all formats and codecs

	av_register_all();

	LOGI("register");

	// Find the decoder for the video stream

	pCodec=avcodec_find_decoder(CODEC_ID_H264);

	if(pCodec == NULL)

	{

		LOGI("avcodec_find_decoder failed");

		return -1; // Codec not found

	}

	else

	{

		pCodecCtx=avcodec_alloc_context3(pCodec);

		if (pCodecCtx == NULL)

		{

			LOGI("avcodec_alloc_context3 failed");

		}



		pCodecCtx->time_base.num = 1; //

		pCodecCtx->time_base.den = 25;

		pCodecCtx->bit_rate = 0; //

		pCodecCtx->frame_number = 1; //

		pCodecCtx->codec_type = CODEC_ID_H264;

		pCodecCtx->width = 704; //

		pCodecCtx->height = 576;		

	}

	// Open codec

	LOGI("avcodec_find_decoder susscess");

	//av_dict_set(&optionsDict, "b", "2.5M", 0);

	//pCodec->capabilities=CODEC_CAP_DELAY;

	if(pCodec->capabilities&CODEC_CAP_TRUNCATED)

	pCodecCtx->flags|= CODEC_FLAG_TRUNCATED;

	int ret = 0;

	if((ret = avcodec_open2(pCodecCtx, pCodec, NULL))<0)

	{

		LOGI("avcodec_open2 failed");		

		return ret; // Could not open codec      ******************程序执行到这里返回-22************

	}

	// Allocate video frame

	pFrame=avcodec_alloc_frame();



	// Allocate an AVFrame structure

	pFrameRGBA=avcodec_alloc_frame();

	if(pFrameRGBA==NULL)

	{

		LOGI("avcodec_alloc_frame failed");		

		return -1;

	}

	//get the scaling context

	sws_ctx = sws_getContext

    (

        pCodecCtx->width,

        pCodecCtx->height,

        pCodecCtx->pix_fmt,

        pCodecCtx->width,

        pCodecCtx->height,

        AV_PIX_FMT_RGBA,

        SWS_BILINEAR,

        NULL,

        NULL,

        NULL

    );



	// Assign appropriate parts of bitmap to image planes in pFrameRGBA

	// Note that pFrameRGBA is an AVFrame, but AVFrame is a superset

	// of AVPicture

	//avpicture_fill((AVPicture *)pFrameRGBA, buffer, AV_PIX_FMT_RGBA,

	//	 pCodecCtx->width, pCodecCtx->height);



	return 0;

}