Timestamps for AVPaket

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C++

C

directshow

Help me please properly set the timestamps.
I have created an output filter, which takes video (MEDIASUBTAYPE_H264) and audio (MEDIASUBTAYPE_AAC).
I have to put it all into a container FLV. To mix the streams, I use libav.
How to calculate for AVPaket presentation timestamp (pts).

static const REFERENCE_TIME UNITS_PER_SECOND = 10000000i64;
     ....
AVPacket pkt;
av_init_packet( &pkt );
pkt.data = pbData;
pkt.size = lDataLength;
pkt.flags |= AV_PKT_FLAG_KEY;

REFERENCE_TIME startTime = m_lastSampleTime.startTime;

if ( video )
{
    ASSERT( m_codecContextVideo );

    num = m_codecContextVideo->time_base.num;
    den = m_codecContextVideo->time_base.den;

    pkt1.pts          = ??? // ::MulDiv( startTime * den, 1, num * UNITS_PER_SECOND );
    pkt1.stream_index = m_streamVideoOutput->index;
}
else
{
   ASSERT( m_codecContextAudio );

   num = m_codecContextAudio->time_base.num;
   den = m_codecContextAudio->time_base.den;

   pkt1.pts = ??? // ::MulDiv( startTime * den, 1, num * UNITS_PER_SECOND );
   pkt1.stream_index = m_streamAudioOutput->index;
}

ASSERT( m_formatContextOutput );

if ( AllConnected() )
{

    av_interleaved_write_frame( m_formatContextOutput, &pkt1 );
}
else
{
    av_write_frame( m_formatContextOutput, &pkt1 );
}