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3518E录制视频,音视频不同步
本帖最后由 Benz 于 2016-11-9 21:16 编辑
请教各位大神,为什么我用3518E录制mp4,音频会慢慢的快于视频啊?播放的开始时间和结束时间都是一致的,搞不明白啊?我是将venc和audio两个例子融合在一起,在一个线程里面调用音频和视频的getstrame的,分别保存了pcm和h264文件,两个同时播放,发现和转码后封mp4差不多,都是音频会慢慢的快于视频。拜托给位帮忙给点思路 !谢谢大家-----这是我的代码,音频用libfacc转码,最后用mp4v2封装mp4:
while(pstAencCtl->bStart)
{
m++;
FD_ZERO(&readVenc_fds);
for (i = 0; i < s32ChnTotal; i++)
{
FD_SET(VencFd, &readVenc_fds);
}
TimeoutVal.tv_sec = 2;
TimeoutVal.tv_usec = 0;
FD_ZERO(&readAenc_fds);
FD_SET(AencFd,&readAenc_fds);
s32Ret = select(maxfd + 1, &readVenc_fds, NULL, NULL, &TimeoutVal);
if (s32Ret < 0)
{
SAMPLE_PRT("select failed!\n");
break;
}
else if (s32Ret == 0)
{
SAMPLE_PRT("get venc stream time out, exit thread\n");
continue;
}
else
{
for (i = 0; i < s32ChnTotal; i++)
{
if (FD_ISSET(VencFd, &readVenc_fds))
{
/*******************************************************
step 2.1 : query how many packs in one-frame stream.
*******************************************************/
memset(&videostStream, 0, sizeof(videostStream));
s32Ret = HI_MPI_VENC_Query(i, &stStat);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("HI_MPI_VENC_Query chn[%d] failed with %#x!\n", i, s32Ret);
break;
}
/*******************************************************
step 2.2 : malloc corresponding number of pack nodes.
*******************************************************/
videostStream.pstPack = (VENC_PACK_S*)malloc(sizeof(VENC_PACK_S) * stStat.u32CurPacks);
if (NULL == videostStream.pstPack)
{
SAMPLE_PRT("malloc stream pack failed!\n");
break;
}
/*******************************************************
step 2.3 : call mpi to get one-frame stream
*******************************************************/
videostStream.u32PackCount = stStat.u32CurPacks;
s32Ret = HI_MPI_VENC_GetStream(i, &videostStream, HI_TRUE);
if (HI_SUCCESS != s32Ret)
{
free(videostStream.pstPack);
videostStream.pstPack = NULL;
SAMPLE_PRT("HI_MPI_VENC_GetStream failed with %#x!\n", \
s32Ret);
break;
}
if(m>25) //从下一个I帧开始,写视频到mp4
{
s32Ret=SAMPLE_COMM_VENC_SaveH264(mp4file,&videostStream);
}
/*******************************************************
step 2.5 : release stream
*******************************************************/
s32Ret = HI_MPI_VENC_ReleaseStream(i, &videostStream);
if (HI_SUCCESS != s32Ret)
{
free(videostStream.pstPack);
videostStream.pstPack = NULL;
break;
}
}
}
}
s32Ret = select(AencFd+1, &readAenc_fds, NULL, NULL, &TimeoutVal);
if (s32Ret < 0)
{
break;
}
else if (0 == s32Ret)
{
printf("%s: get aenc stream select time out\n", __FUNCTION__);
break;
}
if (FD_ISSET(AencFd, &readAenc_fds))
{
s32Ret = HI_MPI_AENC_GetStream(pstAencCtl->AeChn, &audiostStream, HI_TRUE);
if (HI_SUCCESS != s32Ret )
{
printf("%s: HI_MPI_AENC_GetStream(%d), failed with %#x!\n", __FUNCTION__, pstAencCtl->AeChn, s32Ret);
pstAencCtl->bStart = HI_FALSE;
return NULL;
}
fwrite(audiostStream.pStream,1,audiostStream.u32Len, pcm);
if(m>15) //libfaac编码前3帧会失败,跳过前面的25帧,获取下一个I帧再写mp4
{
//AAC转码
memcpy(&buf_tmp[pos],audiostStream.pStream,audiostStream.u32Len);
pos+=640;
// printf("pos is:%d\n",pos);
if(pos < 2048)
{
goto got_the_stream;
}
memcpy(InputBuffer,buf_tmp,2048);
memset(buf_tmp,0,2048);
memcpy(buf_tmp,&buf_tmp[2048],pos-2048);
pos=pos-2048;
flag=faacEncEncode(hEncoder, (int*)InputBuffer,inputSamples,OutputBuffer,maxOutputBytes);
if(flag <= 0)
{
printf("start the Encoder failure\n");
}
if(flag > 0) //音频转ACC再写MP4
{
bool ret=MP4SetTrackESConfiguration(mp4file,audio,spec_buf,spec_len);
if(1!=ret)
{
printf("MP4SetTrackESConfiguration audio failed\n");
}
int nret=MP4WriteSample(mp4file, audio, &OutputBuffer[0], flag,128*8000/1000, 0, 1);
if(1!=nret)
{
printf("MP4WriteSample audio failed\n");
}
}
memset(InputBuffer,0,2048);
memset(OutputBuffer,0,768);
}
got_the_stream:
/*******************************************************
step 2.6 : free pack nodes
*******************************************************/
free(videostStream.pstPack);
videostStream.pstPack = NULL;
// finally you must release the stream
HI_MPI_AENC_ReleaseStream(pstAencCtl->AeChn, &audiostStream);
}
// pasttime=nowtime;
}
faacEncClose(hEncoder);
pstAencCtl->bStart = HI_FALSE;
return NULL;
}
请教各位大神,为什么我用3518E录制mp4,音频会慢慢的快于视频啊?播放的开始时间和结束时间都是一致的,搞不明白啊?我是将venc和audio两个例子融合在一起,在一个线程里面调用音频和视频的getstrame的,分别保存了pcm和h264文件,两个同时播放,发现和转码后封mp4差不多,都是音频会慢慢的快于视频。拜托给位帮忙给点思路 !谢谢大家-----这是我的代码,音频用libfacc转码,最后用mp4v2封装mp4:
while(pstAencCtl->bStart)
{
m++;
FD_ZERO(&readVenc_fds);
for (i = 0; i < s32ChnTotal; i++)
{
FD_SET(VencFd, &readVenc_fds);
}
TimeoutVal.tv_sec = 2;
TimeoutVal.tv_usec = 0;
FD_ZERO(&readAenc_fds);
FD_SET(AencFd,&readAenc_fds);
s32Ret = select(maxfd + 1, &readVenc_fds, NULL, NULL, &TimeoutVal);
if (s32Ret < 0)
{
SAMPLE_PRT("select failed!\n");
break;
}
else if (s32Ret == 0)
{
SAMPLE_PRT("get venc stream time out, exit thread\n");
continue;
}
else
{
for (i = 0; i < s32ChnTotal; i++)
{
if (FD_ISSET(VencFd, &readVenc_fds))
{
/*******************************************************
step 2.1 : query how many packs in one-frame stream.
*******************************************************/
memset(&videostStream, 0, sizeof(videostStream));
s32Ret = HI_MPI_VENC_Query(i, &stStat);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("HI_MPI_VENC_Query chn[%d] failed with %#x!\n", i, s32Ret);
break;
}
/*******************************************************
step 2.2 : malloc corresponding number of pack nodes.
*******************************************************/
videostStream.pstPack = (VENC_PACK_S*)malloc(sizeof(VENC_PACK_S) * stStat.u32CurPacks);
if (NULL == videostStream.pstPack)
{
SAMPLE_PRT("malloc stream pack failed!\n");
break;
}
/*******************************************************
step 2.3 : call mpi to get one-frame stream
*******************************************************/
videostStream.u32PackCount = stStat.u32CurPacks;
s32Ret = HI_MPI_VENC_GetStream(i, &videostStream, HI_TRUE);
if (HI_SUCCESS != s32Ret)
{
free(videostStream.pstPack);
videostStream.pstPack = NULL;
SAMPLE_PRT("HI_MPI_VENC_GetStream failed with %#x!\n", \
s32Ret);
break;
}
if(m>25) //从下一个I帧开始,写视频到mp4
{
s32Ret=SAMPLE_COMM_VENC_SaveH264(mp4file,&videostStream);
}
/*******************************************************
step 2.5 : release stream
*******************************************************/
s32Ret = HI_MPI_VENC_ReleaseStream(i, &videostStream);
if (HI_SUCCESS != s32Ret)
{
free(videostStream.pstPack);
videostStream.pstPack = NULL;
break;
}
}
}
}
s32Ret = select(AencFd+1, &readAenc_fds, NULL, NULL, &TimeoutVal);
if (s32Ret < 0)
{
break;
}
else if (0 == s32Ret)
{
printf("%s: get aenc stream select time out\n", __FUNCTION__);
break;
}
if (FD_ISSET(AencFd, &readAenc_fds))
{
s32Ret = HI_MPI_AENC_GetStream(pstAencCtl->AeChn, &audiostStream, HI_TRUE);
if (HI_SUCCESS != s32Ret )
{
printf("%s: HI_MPI_AENC_GetStream(%d), failed with %#x!\n", __FUNCTION__, pstAencCtl->AeChn, s32Ret);
pstAencCtl->bStart = HI_FALSE;
return NULL;
}
fwrite(audiostStream.pStream,1,audiostStream.u32Len, pcm);
if(m>15) //libfaac编码前3帧会失败,跳过前面的25帧,获取下一个I帧再写mp4
{
//AAC转码
memcpy(&buf_tmp[pos],audiostStream.pStream,audiostStream.u32Len);
pos+=640;
// printf("pos is:%d\n",pos);
if(pos < 2048)
{
goto got_the_stream;
}
memcpy(InputBuffer,buf_tmp,2048);
memset(buf_tmp,0,2048);
memcpy(buf_tmp,&buf_tmp[2048],pos-2048);
pos=pos-2048;
flag=faacEncEncode(hEncoder, (int*)InputBuffer,inputSamples,OutputBuffer,maxOutputBytes);
if(flag <= 0)
{
printf("start the Encoder failure\n");
}
if(flag > 0) //音频转ACC再写MP4
{
bool ret=MP4SetTrackESConfiguration(mp4file,audio,spec_buf,spec_len);
if(1!=ret)
{
printf("MP4SetTrackESConfiguration audio failed\n");
}
int nret=MP4WriteSample(mp4file, audio, &OutputBuffer[0], flag,128*8000/1000, 0, 1);
if(1!=nret)
{
printf("MP4WriteSample audio failed\n");
}
}
memset(InputBuffer,0,2048);
memset(OutputBuffer,0,768);
}
got_the_stream:
/*******************************************************
step 2.6 : free pack nodes
*******************************************************/
free(videostStream.pstPack);
videostStream.pstPack = NULL;
// finally you must release the stream
HI_MPI_AENC_ReleaseStream(pstAencCtl->AeChn, &audiostStream);
}
// pasttime=nowtime;
}
faacEncClose(hEncoder);
pstAencCtl->bStart = HI_FALSE;
return NULL;
}
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