[OBS] cooperation between video and audio coding and RTMP transmission

• Refer to the records of the great God ：

• 【obs-studio Open source projects from getting started to giving up 】audio_thread Audio coding thread understanding
  

• here we are add_packet here , The timestamp of the packet should not be modified anymore

• This is already rtmp The last timestamp position before sending .

• therefore , Processing lost frame transmission in this link .

encoder To rtmp sender

static void rtmp_stream_data(void *data, struct encoder_packet *packet)

• Encoded package , Will join the queue here