ffmpeg编码如何实现同时录制声卡和麦克风的声音？

我需要同时录制屏幕，声卡和麦克风的声音。

代码是从http://blog.csdn.net/dancing_night/article/details/46698853的代码中改的，非常感谢原作者。

代码下面贴出来：

#include "stdafx.h"  
  
#ifdef  __cplusplus  
extern "C"  
{  
#endif  
#include "libavcodec/avcodec.h"  
#include "libavformat/avformat.h"  
#include "libswscale/swscale.h"  
#include "libavdevice/avdevice.h"  
#include "libavutil/audio_fifo.h"  
  
#pragma comment(lib, "avcodec.lib")  
#pragma comment(lib, "avformat.lib")  
#pragma comment(lib, "avutil.lib")  
#pragma comment(lib, "avdevice.lib")  
#pragma comment(lib, "avfilter.lib")  
  
//#pragma comment(lib, "avfilter.lib")  
//#pragma comment(lib, "postproc.lib")  
//#pragma comment(lib, "swresample.lib")  
#pragma comment(lib, "swscale.lib")  
#ifdef __cplusplus  
};  
#endif 

AVFormatContext	*pFormatCtx_Video = NULL, *pFormatCtx_Audio = NULL, *pFormatCtx_Audio_mic = NULL, *pFormatCtx_Out = NULL;
AVCodecContext	*pCodecCtx_Video;
AVCodec			*pCodec_Video;
AVFifoBuffer	*fifo_video = NULL;
AVAudioFifo		*fifo_audio = NULL;
AVAudioFifo		*fifo_audio_mic = NULL;
int VideoIndex, AudioIndex, AudioIndex_mic;

CRITICAL_SECTION AudioSection, AudioSection_mic, VideoSection;

SwsContext *img_convert_ctx;
int frame_size = 0;

uint8_t *picture_buf = NULL, *frame_buf = NULL;

bool bCap = true;
bool bStop = false;
char* m_szPath = "test.mp4";
int m_nFramerate = 15;

DWORD WINAPI startRecordThread(LPVOID lpParam);
DWORD WINAPI ScreenCapThreadProc(LPVOID lpParam);
DWORD WINAPI AudioCapThreadProc(LPVOID lpParam);
DWORD WINAPI AudioMicCapThreadProc(LPVOID lpParam);

int OpenVideoCapture()
{
	AVInputFormat *ifmt = av_find_input_format("gdigrab");
	//这里可以加参数打开，例如可以指定采集帧率
	AVDictionary *options = NULL;
	char szFramerate[4];
	sprintf(szFramerate, "%d", m_nFramerate);
	av_dict_set(&options, "framerate", szFramerate, NULL);
	//av_dict_set(&options,"offset_x","20",0);
	//The distance from the top edge of the screen or desktop
	//av_dict_set(&options,"offset_y","40",0);
	//Video frame size. The default is to capture the full screen
	//av_dict_set(&options,"video_size","320x240",0);
	if (avformat_open_input(&pFormatCtx_Video, "desktop", ifmt, &options) != 0)
	{
		printf("Couldn't open input stream.（无法打开视频输入流）\n");
		return -1;
	}
	if (avformat_find_stream_info(pFormatCtx_Video, NULL)<0)
	{
		printf("Couldn't find stream information.（无法获取视频流信息）\n");
		return -1;
	}
	if (pFormatCtx_Video->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
	{
		printf("Couldn't find video stream information.（无法获取视频流信息）\n");
		return -1;
	}
	pCodecCtx_Video = pFormatCtx_Video->streams[0]->codec;
	pCodec_Video = avcodec_find_decoder(pCodecCtx_Video->codec_id);
	if (pCodec_Video == NULL)
	{
		printf("Codec not found.（没有找到解码器）\n");
		return -1;
	}
	if (avcodec_open2(pCodecCtx_Video, pCodec_Video, NULL) < 0)
	{
		printf("Could not open codec.（无法打开解码器）\n");
		return -1;
	}

	//pCodecCtx_Video->bit_rate = 1000000;
	//pCodecCtx_Video->rc_min_rate = 128000;
	//pCodecCtx_Video->rc_max_rate = 2500000;

	img_convert_ctx = sws_getContext(pCodecCtx_Video->width, pCodecCtx_Video->height, pCodecCtx_Video->pix_fmt,
		pCodecCtx_Video->width, pCodecCtx_Video->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);

	frame_size = avpicture_get_size(pCodecCtx_Video->pix_fmt, pCodecCtx_Video->width, pCodecCtx_Video->height);
	//申请30帧缓存
	fifo_video = av_fifo_alloc(30 * avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx_Video->width, pCodecCtx_Video->height));

	return 0;
}

static char *dup_wchar_to_utf8(wchar_t *w)
{
	char *s = NULL;
	int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
	s = (char *)av_malloc(l);
	if (s)
		WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
	return s;
}

int OpenAudioCapture()
{
	//查找输入方式
	AVInputFormat *pAudioInputFmt = av_find_input_format("dshow");

	//以Direct Show的方式打开设备，并将 输入方式 关联到格式上下文   audio=virtual-audio-capturer
	char * psDevName = dup_wchar_to_utf8(L"audio=virtual-audio-capturer");

	if (avformat_open_input(&pFormatCtx_Audio, psDevName, pAudioInputFmt, NULL) < 0)
	{
		printf("Couldn't open input stream.（无法打开音频输入流）\n");
		return -1;
	}

	if (avformat_find_stream_info(pFormatCtx_Audio, NULL)<0)
		return -1;

	if (pFormatCtx_Audio->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
	{
		printf("Couldn't find video stream information.（无法获取音频流信息）\n");
		return -1;
	}

	AVCodec *tmpCodec = avcodec_find_decoder(pFormatCtx_Audio->streams[0]->codec->codec_id);
	if (0 > avcodec_open2(pFormatCtx_Audio->streams[0]->codec, tmpCodec, NULL))
	{
		printf("can not find or open audio decoder!\n");
	}

	return 0;
}

int OpenAudioCapture_mic()
{
	//查找输入方式
	AVInputFormat *pAudioInputFmt = av_find_input_format("dshow");

	//以Direct Show的方式打开设备，并将 输入方式 关联到格式上下文
	char * psDevName = dup_wchar_to_utf8(L"audio=FrontMic (Realtek High Definiti");

	if (avformat_open_input(&pFormatCtx_Audio_mic, psDevName, pAudioInputFmt, NULL) < 0)
	{
		printf("Couldn't open input stream.（无法打开音频输入流）\n");
		return -1;
	}

	if (avformat_find_stream_info(pFormatCtx_Audio_mic, NULL)<0)
		return -1;

	if (pFormatCtx_Audio_mic->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
	{
		printf("Couldn't find video stream information.（无法获取音频流信息）\n");
		return -1;
	}

	AVCodec *tmpCodec = avcodec_find_decoder(pFormatCtx_Audio_mic->streams[0]->codec->codec_id);
	if (0 > avcodec_open2(pFormatCtx_Audio_mic->streams[0]->codec, tmpCodec, NULL))
	{
		printf("can not find or open audio decoder!\n");
	}

	return 0;
}

int OpenOutPut()
{
	AVStream *pVideoStream = NULL, *pAudioStream = NULL, *pAudioStream_mic = NULL;
	const char *outFileName = m_szPath;
	avformat_alloc_output_context2(&pFormatCtx_Out, NULL, NULL, outFileName);

	if (pFormatCtx_Video->streams[0]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
	{
		AVCodecContext *videoCodecCtx;
		VideoIndex = 0;
		pVideoStream = avformat_new_stream(pFormatCtx_Out, NULL);

		if (!pVideoStream)
		{
			printf("can not new stream for output!\n");
			return -1;
		}

		//set codec context param
		pVideoStream->codec->codec = avcodec_find_encoder(AV_CODEC_ID_MPEG4);
		pVideoStream->codec->height = pFormatCtx_Video->streams[0]->codec->height;
		pVideoStream->codec->width = pFormatCtx_Video->streams[0]->codec->width;

		pVideoStream->codec->time_base = pFormatCtx_Video->streams[0]->codec->time_base;
		pVideoStream->codec->sample_aspect_ratio = pFormatCtx_Video->streams[0]->codec->sample_aspect_ratio;
		// take first format from list of supported formats
		pVideoStream->codec->pix_fmt = pFormatCtx_Out->streams[VideoIndex]->codec->codec->pix_fmts[0];

		//pVideoStream->codec->bit_rate = 1000000;
		//pVideoStream->codec->rc_min_rate = 128000;
		//pVideoStream->codec->rc_max_rate = 2500000;
		//open encoder
		if (!pVideoStream->codec->codec)
		{
			printf("can not find the encoder!\n");
			return -1;
		}

		if (pFormatCtx_Out->oformat->flags & AVFMT_GLOBALHEADER)
			pVideoStream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;

		if ((avcodec_open2(pVideoStream->codec, pVideoStream->codec->codec, NULL)) < 0)
		{
			printf("can not open the encoder\n");
			return -1;
		}
	}

	if (pFormatCtx_Audio->streams[0]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
	{
		AVCodecContext *pOutputCodecCtx;
		AudioIndex = 1;
		pAudioStream = avformat_new_stream(pFormatCtx_Out, NULL);

		pAudioStream->codec->codec = avcodec_find_encoder(pFormatCtx_Out->oformat->audio_codec);

		pOutputCodecCtx = pAudioStream->codec;

		pOutputCodecCtx->sample_rate = pFormatCtx_Audio->streams[0]->codec->sample_rate;
		pOutputCodecCtx->channel_layout = pFormatCtx_Out->streams[0]->codec->channel_layout;
		pOutputCodecCtx->channels = av_get_channel_layout_nb_channels(pAudioStream->codec->channel_layout);
		if (pOutputCodecCtx->channel_layout == 0)
		{
			pOutputCodecCtx->channel_layout = AV_CH_LAYOUT_STEREO;
			pOutputCodecCtx->channels = av_get_channel_layout_nb_channels(pOutputCodecCtx->channel_layout);

		}
		pOutputCodecCtx->sample_fmt = pAudioStream->codec->codec->sample_fmts[0];
		AVRational time_base = { 1, pAudioStream->codec->sample_rate };
		pAudioStream->time_base = time_base;
		//audioCodecCtx->time_base = time_base;

		pOutputCodecCtx->codec_tag = 0;
		if (pFormatCtx_Out->oformat->flags & AVFMT_GLOBALHEADER)
			pOutputCodecCtx->flags |= CODEC_FLAG_GLOBAL_HEADER;

		if (avcodec_open2(pOutputCodecCtx, pOutputCodecCtx->codec, 0) < 0)
		{
			//编码器打开失败，退出程序
			return -1;
		}
	}

	if (pFormatCtx_Audio_mic->streams[0]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
	{
		AVCodecContext *pOutputCodecCtx_mic;
		AudioIndex_mic = 1;
		pAudioStream_mic = avformat_new_stream(pFormatCtx_Out, NULL);

		pAudioStream_mic->codec->codec = avcodec_find_encoder(pFormatCtx_Out->oformat->audio_codec);

		pOutputCodecCtx_mic = pAudioStream_mic->codec;

		pOutputCodecCtx_mic->sample_rate = pFormatCtx_Audio_mic->streams[0]->codec->sample_rate;
		pOutputCodecCtx_mic->channel_layout = pFormatCtx_Out->streams[0]->codec->channel_layout;
		pOutputCodecCtx_mic->channels = av_get_channel_layout_nb_channels(pAudioStream_mic->codec->channel_layout);
		if (pOutputCodecCtx_mic->channel_layout == 0)
		{
			pOutputCodecCtx_mic->channel_layout = AV_CH_LAYOUT_STEREO;
			pOutputCodecCtx_mic->channels = av_get_channel_layout_nb_channels(pOutputCodecCtx_mic->channel_layout);

		}
		pOutputCodecCtx_mic->sample_fmt = pAudioStream_mic->codec->codec->sample_fmts[0];
		AVRational time_base = { 1, pAudioStream_mic->codec->sample_rate };
		pAudioStream_mic->time_base = time_base;
		//audioCodecCtx->time_base = time_base;

		pOutputCodecCtx_mic->codec_tag = 0;
		if (pFormatCtx_Out->oformat->flags & AVFMT_GLOBALHEADER)
			pOutputCodecCtx_mic->flags |= CODEC_FLAG_GLOBAL_HEADER;

		if (avcodec_open2(pOutputCodecCtx_mic, pOutputCodecCtx_mic->codec, 0) < 0)
		{
			//编码器打开失败，退出程序
			return -1;
		}
	}

	if (!(pFormatCtx_Out->oformat->flags & AVFMT_NOFILE))
	{
		if (avio_open(&pFormatCtx_Out->pb, outFileName, AVIO_FLAG_WRITE) < 0)
		{
			printf("can not open output file handle!\n");
			return -1;
		}
	}

	if (avformat_write_header(pFormatCtx_Out, NULL) < 0)
	{
		printf("can not write the header of the output file!\n");
		return -1;
	}

	return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
	av_register_all();
	avdevice_register_all();
	if (OpenVideoCapture() < 0)
	{
		return -1;
	}
	if (OpenAudioCapture() < 0)
	{
		return -1;
	}
	if (OpenAudioCapture_mic() < 0)
	{
		return -1;
	}
	if (OpenOutPut() < 0)
	{
		return -1;
	}

	InitializeCriticalSection(&VideoSection);
	InitializeCriticalSection(&AudioSection);
	InitializeCriticalSection(&AudioSection_mic);

	AVFrame *picture = av_frame_alloc();
	int size = avpicture_get_size(pFormatCtx_Out->streams[VideoIndex]->codec->pix_fmt,
		pFormatCtx_Out->streams[VideoIndex]->codec->width, pFormatCtx_Out->streams[VideoIndex]->codec->height);
	picture_buf = new uint8_t[size];

	avpicture_fill((AVPicture *)picture, picture_buf,
		pFormatCtx_Out->streams[VideoIndex]->codec->pix_fmt,
		pFormatCtx_Out->streams[VideoIndex]->codec->width,
		pFormatCtx_Out->streams[VideoIndex]->codec->height);

	//star cap screen thread
	CreateThread(NULL, 0, ScreenCapThreadProc, 0, 0, NULL);
	//star cap audio thread
	CreateThread(NULL, 0, AudioCapThreadProc, 0, 0, NULL);
	//star cap audio mic thread
	CreateThread(NULL, 0, AudioMicCapThreadProc, 0, 0, NULL);
	int64_t cur_pts_v = 0, cur_pts_a = 0, cur_pts_a_m = 0;
	int VideoFrameIndex = 0, AudioFrameIndex = 0, AudioFrameIndex_mic = 0;

	while (1)
	{
		if (bStop && bCap)
		{
			bCap = false;
			Sleep(2000);//简单的用sleep等待采集线程关闭
		}
		if (fifo_audio && fifo_audio_mic && fifo_video)
		{
			int sizeAudio = av_audio_fifo_size(fifo_audio);
			int sizeAudio_mic = av_audio_fifo_size(fifo_audio_mic);
			int sizeVideo = av_fifo_size(fifo_video);
			//缓存数据写完就结束循环
			if (av_audio_fifo_size(fifo_audio) <= pFormatCtx_Out->streams[AudioIndex]->codec->frame_size &&
				av_audio_fifo_size(fifo_audio_mic) <= pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size &&
				av_fifo_size(fifo_video) <= frame_size && !bCap)
			{
				break;
			}
		}

		if (av_compare_ts(cur_pts_v, pFormatCtx_Out->streams[VideoIndex]->time_base,
			cur_pts_a, pFormatCtx_Out->streams[AudioIndex]->time_base) <= 0 && 
			av_compare_ts(cur_pts_v, pFormatCtx_Out->streams[VideoIndex]->time_base,
				cur_pts_a_m, pFormatCtx_Out->streams[AudioIndex_mic]->time_base) <= 0)
		{
			//read data from fifo
			if (av_fifo_size(fifo_video) < frame_size && !bCap)
			{
				cur_pts_v = 0x7fffffffffffffff;
			}
			if (av_fifo_size(fifo_video) >= size)
			{
				EnterCriticalSection(&VideoSection);
				av_fifo_generic_read(fifo_video, picture_buf, size, NULL);
				LeaveCriticalSection(&VideoSection);

				avpicture_fill((AVPicture *)picture, picture_buf,
					pFormatCtx_Out->streams[VideoIndex]->codec->pix_fmt,
					pFormatCtx_Out->streams[VideoIndex]->codec->width,
					pFormatCtx_Out->streams[VideoIndex]->codec->height);

				//pts = n * (（1 / timbase）/ fps);
				picture->pts = VideoFrameIndex * ((pFormatCtx_Video->streams[0]->time_base.den / pFormatCtx_Video->streams[0]->time_base.num) / m_nFramerate);

				int got_picture = 0;
				AVPacket pkt;
				av_init_packet(&pkt);

				pkt.data = NULL;
				pkt.size = 0;
				int ret = avcodec_encode_video2(pFormatCtx_Out->streams[VideoIndex]->codec, &pkt, picture, &got_picture);
				if (ret < 0)
				{
					//编码错误,不理会此帧
					continue;
				}

				if (got_picture == 1)
				{
					pkt.stream_index = VideoIndex;
					pkt.pts = av_rescale_q_rnd(pkt.pts, pFormatCtx_Video->streams[0]->time_base,
						pFormatCtx_Out->streams[VideoIndex]->time_base, (AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
					pkt.dts = av_rescale_q_rnd(pkt.dts, pFormatCtx_Video->streams[0]->time_base,
						pFormatCtx_Out->streams[VideoIndex]->time_base, (AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));

					pkt.duration = ((pFormatCtx_Out->streams[0]->time_base.den / pFormatCtx_Out->streams[0]->time_base.num) / m_nFramerate);

					cur_pts_v = pkt.pts;

					ret = av_interleaved_write_frame(pFormatCtx_Out, &pkt);
					//delete[] pkt.data;
					av_free_packet(&pkt);
				}
				VideoFrameIndex++;
			}
		}
		else
		{
			if (av_compare_ts(cur_pts_v, pFormatCtx_Out->streams[VideoIndex]->time_base,
				cur_pts_a, pFormatCtx_Out->streams[AudioIndex]->time_base) > 0)
			{
				if (NULL == fifo_audio)
				{
					continue;//还未初始化fifo
				}
				if (av_audio_fifo_size(fifo_audio) < pFormatCtx_Out->streams[AudioIndex]->codec->frame_size && !bCap)
				{
					cur_pts_a = 0x7fffffffffffffff;
				}
				if (av_audio_fifo_size(fifo_audio) >=
					(pFormatCtx_Out->streams[AudioIndex]->codec->frame_size > 0 ? pFormatCtx_Out->streams[AudioIndex]->codec->frame_size : 1024))
				{
					AVFrame *frame;
					frame = av_frame_alloc();
					frame->nb_samples = pFormatCtx_Out->streams[AudioIndex]->codec->frame_size>0 ? pFormatCtx_Out->streams[AudioIndex]->codec->frame_size : 1024;
					frame->channel_layout = pFormatCtx_Out->streams[AudioIndex]->codec->channel_layout;
					frame->format = pFormatCtx_Out->streams[AudioIndex]->codec->sample_fmt;
					frame->sample_rate = pFormatCtx_Out->streams[AudioIndex]->codec->sample_rate;
					av_frame_get_buffer(frame, 0);

					EnterCriticalSection(&AudioSection);
					av_audio_fifo_read(fifo_audio, (void **)frame->data,
						(pFormatCtx_Out->streams[AudioIndex]->codec->frame_size > 0 ? pFormatCtx_Out->streams[AudioIndex]->codec->frame_size : 1024));
					LeaveCriticalSection(&AudioSection);

					if (pFormatCtx_Out->streams[0]->codec->sample_fmt != pFormatCtx_Audio->streams[AudioIndex]->codec->sample_fmt
						|| pFormatCtx_Out->streams[0]->codec->channels != pFormatCtx_Audio->streams[AudioIndex]->codec->channels
						|| pFormatCtx_Out->streams[0]->codec->sample_rate != pFormatCtx_Audio->streams[AudioIndex]->codec->sample_rate)
					{
						//如果输入和输出的音频格式不一样 需要重采样，这里是一样的就没做
					}

					AVPacket pkt_out;
					av_init_packet(&pkt_out);
					int got_picture = -1;
					pkt_out.data = NULL;
					pkt_out.size = 0;

					frame->pts = AudioFrameIndex * pFormatCtx_Out->streams[AudioIndex]->codec->frame_size;
					if (avcodec_encode_audio2(pFormatCtx_Out->streams[AudioIndex]->codec, &pkt_out, frame, &got_picture) < 0)
					{
						printf("can not decoder a frame");
					}
					av_frame_free(&frame);
					if (got_picture)
					{
						pkt_out.stream_index = AudioIndex;
						pkt_out.pts = AudioFrameIndex * pFormatCtx_Out->streams[AudioIndex]->codec->frame_size;
						pkt_out.dts = AudioFrameIndex * pFormatCtx_Out->streams[AudioIndex]->codec->frame_size;
						pkt_out.duration = pFormatCtx_Out->streams[AudioIndex]->codec->frame_size;

						cur_pts_a = pkt_out.pts;
						Write_Log(LOG_INFO, "Current audio pts is %d", pkt_out.pts);
						int ret = av_interleaved_write_frame(pFormatCtx_Out, &pkt_out);
						av_free_packet(&pkt_out);
					}
					AudioFrameIndex++;
				}
			}

			if (av_compare_ts(cur_pts_v, pFormatCtx_Out->streams[VideoIndex]->time_base,
				cur_pts_a_m, pFormatCtx_Out->streams[AudioIndex_mic]->time_base) > 0)
			{
				if (NULL == fifo_audio_mic)
				{
					continue;//还未初始化fifo
				}
				if (av_audio_fifo_size(fifo_audio_mic) < pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size && !bCap)
				{
					cur_pts_a_m = 0x7fffffffffffffff;
				}
				if (av_audio_fifo_size(fifo_audio_mic) >=
					(pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size > 0 ? pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size : 1024))
				{
					AVFrame *frame_mic;
					frame_mic = av_frame_alloc();
					frame_mic->nb_samples = pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size>0 ? pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size : 1024;
					frame_mic->channel_layout = pFormatCtx_Out->streams[AudioIndex_mic]->codec->channel_layout;
					frame_mic->format = pFormatCtx_Out->streams[AudioIndex_mic]->codec->sample_fmt;
					frame_mic->sample_rate = pFormatCtx_Out->streams[AudioIndex_mic]->codec->sample_rate;
					av_frame_get_buffer(frame_mic, 0);

					EnterCriticalSection(&AudioSection_mic);
					av_audio_fifo_read(fifo_audio_mic, (void **)frame_mic->data,
						(pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size > 0 ? pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size : 1024));
					LeaveCriticalSection(&AudioSection_mic);

					AVPacket pkt_out_mic;
					av_init_packet(&pkt_out_mic);
					int got_picture_mic = -1;
					pkt_out_mic.data = NULL;
					pkt_out_mic.size = 0;

					frame_mic->pts = AudioFrameIndex_mic * pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size;
					if (avcodec_encode_audio2(pFormatCtx_Out->streams[AudioIndex_mic]->codec, &pkt_out_mic, frame_mic, &got_picture_mic) < 0)
					{
						printf("can not decoder a frame");
					}
					av_frame_free(&frame_mic);
					if (got_picture_mic)
					{
						pkt_out_mic.stream_index = AudioIndex_mic;
						pkt_out_mic.pts = AudioFrameIndex_mic * pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size;
						pkt_out_mic.dts = AudioFrameIndex_mic * pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size;
						pkt_out_mic.duration = pFormatCtx_Out->streams[AudioIndex_mic]->codec->frame_size;

						cur_pts_a_m = pkt_out_mic.pts;
						Write_Log(LOG_INFO, ">>>>>Current audio(mic) pts is %d", pkt_out_mic.pts);
						int ret = av_interleaved_write_frame(pFormatCtx_Out, &pkt_out_mic);
						av_free_packet(&pkt_out_mic);
					}
					AudioFrameIndex_mic++;
				}
			}
		}
	}

	delete[] picture_buf;

	av_fifo_free(fifo_video);
	av_audio_fifo_free(fifo_audio);
	av_audio_fifo_free(fifo_audio_mic);

	av_write_trailer(pFormatCtx_Out);

	avio_close(pFormatCtx_Out->pb);
	avformat_free_context(pFormatCtx_Out);

	if (pFormatCtx_Video != NULL)
	{
		avformat_close_input(&pFormatCtx_Video);
		pFormatCtx_Video = NULL;
	}
	if (pFormatCtx_Audio != NULL)
	{
		avformat_close_input(&pFormatCtx_Audio);
		pFormatCtx_Audio = NULL;
	}
	if (pFormatCtx_Audio_mic != NULL)
	{
		avformat_close_input(&pFormatCtx_Audio_mic);
		pFormatCtx_Audio_mic = NULL;
	}

	return 0;
}

DWORD WINAPI ScreenCapThreadProc(LPVOID lpParam)
{
	AVPacket packet;/* = (AVPacket *)av_malloc(sizeof(AVPacket))*/;
	int got_picture;
	AVFrame	*pFrame;
	pFrame = av_frame_alloc();

	AVFrame *picture = av_frame_alloc();
	int size = avpicture_get_size(pFormatCtx_Out->streams[VideoIndex]->codec->pix_fmt,
		pFormatCtx_Out->streams[VideoIndex]->codec->width, pFormatCtx_Out->streams[VideoIndex]->codec->height);
	//picture_buf = new uint8_t[size];

	avpicture_fill((AVPicture *)picture, picture_buf,
		pFormatCtx_Out->streams[VideoIndex]->codec->pix_fmt,
		pFormatCtx_Out->streams[VideoIndex]->codec->width,
		pFormatCtx_Out->streams[VideoIndex]->codec->height);

	FILE *p = NULL;
	p = fopen("proc_test.yuv", "wb+");
	av_init_packet(&packet);
	int height = pFormatCtx_Out->streams[VideoIndex]->codec->height;
	int width = pFormatCtx_Out->streams[VideoIndex]->codec->width;
	int y_size = height*width;
	while (bCap)
	{
		packet.data = NULL;
		packet.size = 0;
		if (av_read_frame(pFormatCtx_Video, &packet) < 0)
		{
			continue;
		}
		if (packet.stream_index == 0)
		{
			if (avcodec_decode_video2(pCodecCtx_Video, pFrame, &got_picture, &packet) < 0)
			{
				printf("Decode Error.（解码错误）\n");
				continue;
			}
			if (got_picture)
			{
				sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0,
					pFormatCtx_Out->streams[VideoIndex]->codec->height, picture->data, picture->linesize);

				if (av_fifo_space(fifo_video) >= size)
				{
					EnterCriticalSection(&VideoSection);
					av_fifo_generic_write(fifo_video, picture->data[0], y_size, NULL);
					av_fifo_generic_write(fifo_video, picture->data[1], y_size / 4, NULL);
					av_fifo_generic_write(fifo_video, picture->data[2], y_size / 4, NULL);
					LeaveCriticalSection(&VideoSection);
				}
			}
		}
		av_free_packet(&packet);
		//Sleep(50);
	}
	av_frame_free(&pFrame);
	av_frame_free(&picture);
	//delete[] picture_buf;
	return 0;
}

DWORD WINAPI AudioCapThreadProc(LPVOID lpParam)
{
	AVPacket pkt;
	AVFrame *frame;
	frame = av_frame_alloc();
	int gotframe;
	while (bCap)
	{
		pkt.data = NULL;
		pkt.size = 0;
		if (av_read_frame(pFormatCtx_Audio, &pkt) < 0)
		{
			continue;
		}

		if (avcodec_decode_audio4(pFormatCtx_Audio->streams[0]->codec, frame, &gotframe, &pkt) < 0)
		{
			av_frame_free(&frame);
			printf("can not decoder a frame");
			break;
		}
		av_free_packet(&pkt);

		if (!gotframe)
		{
			continue;//没有获取到数据，继续下一次
		}

		if (NULL == fifo_audio)
		{
			fifo_audio = av_audio_fifo_alloc(pFormatCtx_Audio->streams[0]->codec->sample_fmt,
				pFormatCtx_Audio->streams[0]->codec->channels, 30 * frame->nb_samples);
		}

		int buf_space = av_audio_fifo_space(fifo_audio);
		if (av_audio_fifo_space(fifo_audio) >= frame->nb_samples)
		{
			EnterCriticalSection(&AudioSection);
			av_audio_fifo_write(fifo_audio, (void **)frame->data, frame->nb_samples);
			LeaveCriticalSection(&AudioSection);
		}
	}
	av_frame_free(&frame);
	return 0;
}


DWORD WINAPI AudioMicCapThreadProc(LPVOID lpParam)
{
	AVPacket pkt;
	AVFrame *frame;
	frame = av_frame_alloc();
	int gotframe;
	while (bCap)
	{
		pkt.data = NULL;
		pkt.size = 0;
		if (av_read_frame(pFormatCtx_Audio_mic, &pkt) < 0)
		{
			continue;
		}

		if (avcodec_decode_audio4(pFormatCtx_Audio_mic->streams[0]->codec, frame, &gotframe, &pkt) < 0)
		{
			av_frame_free(&frame);
			printf("can not decoder a frame");
			break;
		}
		av_free_packet(&pkt);

		if (!gotframe)
		{
			continue;//没有获取到数据，继续下一次
		}

		if (NULL == fifo_audio_mic)
		{
			fifo_audio_mic = av_audio_fifo_alloc(pFormatCtx_Audio_mic->streams[0]->codec->sample_fmt,
				pFormatCtx_Audio_mic->streams[0]->codec->channels, 30 * frame->nb_samples);
		}

		int buf_space = av_audio_fifo_space(fifo_audio_mic);
		if (av_audio_fifo_space(fifo_audio_mic) >= frame->nb_samples)
		{
			EnterCriticalSection(&AudioSection_mic);
			av_audio_fifo_write(fifo_audio_mic, (void **)frame->data, frame->nb_samples);
			LeaveCriticalSection(&AudioSection_mic);
		}
	}
	av_frame_free(&frame);
	return 0;
}

但是我编码时，只能录制屏幕和virtual-audio-capturer，或者屏幕和麦克风，不能同时录制三个，请问这是为什么？

路过的大神，请问一下是哪里不对了？

但是我编码时，只能录制屏幕和virtual-audio-capturer，或者屏幕和麦克风，不能同时录制三个，请问这是为什么？