i want to sync my video using ffmpeg
 

I create my program which play multimedia files using ffmpeg library.


I'm trying to sync video and audio.

my decode source following line.

////////////////////////////////////////////////////////////////
if(av_read_frame(m_pFormatCtx, &packet) >= 0)
{

if(packet.stream_index == m_nAudioStream)
{
audioDecoded = avcodec_decode_audio(m_pAudioCtx, m_outbuf, &m_count, packet.data, packet.size);
play_sound();


}
if(packet.stream_index == m_nVideoStream)
{


bytesDecoded = avcodec_decode_video(m_pCodecCtx, m_pFrame, &frameFinished, packet.data, packet.size);

if(frameFinished)
{


ImgReSampleContext *s;
s = img_resample_full_init( m_width, m_height, m_pCodecCtx->width, m_pCodecCtx->height, 0, 0, 0, 0 ,0 ,0, 0 ,0);
img_resample(s, (AVPicture *)m_pic, (AVPicture *)m_pFrame);

img_convert((AVPicture *)m_pFrameRGB, PIX_FMT_RGB24, (AVPicture *)m_pic, PIX_FMT_YUV420P, m_width, m_height);
img_resample_close(s);

////////////////////////////////////////////////////////////////////////

anyway sync is correct because play_sound function.

but i can't use play_sound to sync audio and video


anyone who use ffmpeg libaray to decode video files ?