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DM8127 音视频不同步问题



视频直接从文件中读出,
现在是pal制式输出,现象是视频超前(视频 : 音频=  6:5)
音视频同步相应代码如下
#define VDEC_VDIS_FRAME_DURATION_MS (33)

static Void VdecVdis_setFrameTimeStamp(VCODEC_BITSBUF_S *pEmptyBuf)
{
    UInt64 curTimeStamp =
      gVdecVdis_config.frameCnt[pEmptyBuf->chnId] * VDEC_VDIS_FRAME_DURATION_MS;
    pEmptyBuf->lowerTimeStamp = (UInt32)(curTimeStamp & 0xFFFFFFFF);
    pEmptyBuf->upperTimeStamp = (UInt32)((curTimeStamp >> 32)& 0xFFFFFFFF);
    pEmptyBuf->timestamp = (UInt32)Avsync_getWallTime();
    if (0 == gVdecVdis_config.frameCnt[pEmptyBuf->chnId])
    {
        UInt32 displayChId;

        Vdec_mapDec2DisplayChId(VDIS_DEV_HDMI,pEmptyBuf->chnId,&displayChId);
        Vdis_setFirstVidPTS(VDIS_DEV_HDMI,displayChId,curTimeStamp);
        Vdec_mapDec2DisplayChId(VDIS_DEV_HDCOMP,pEmptyBuf->chnId,&displayChId);
        Vdis_setFirstVidPTS(VDIS_DEV_HDCOMP,displayChId,curTimeStamp);
        Vdec_mapDec2DisplayChId(VDIS_DEV_SD,pEmptyBuf->chnId,&displayChId);
        Vdis_setFirstVidPTS(VDIS_DEV_SD,displayChId,curTimeStamp);
    }
    gVdecVdis_config.frameCnt[pEmptyBuf->chnId] += 1;
}
在程序中 #define VDEC_VDIS_FRAME_DURATION_MS (33)
宏定义中 33什么意思?为什么把那个宏改成25,没有效果。?
谢谢!!!