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DVRRDK350 the capture timestamp is 0?

Hello:

      my link chain: capture-->ipc--->enc--->ipc->A8

      I get the encoder bitstream from the encoder,in the bitstream data struct have a variable: timestamp,this is capture time,but recently I met a issue,this variable always zero ,never change,this will lead bad pts,so I need solve it,but current I don't know the reason, from the vpss and capture link code,I think it's impossible zero.

     so if anyone know please give me some advice!