JVC VN-V686UAPI 用户手册

<form name="myForm">

<table><tr><td>

<INPUT TYPE="BUTTON" NAME="still_btn" VALUE="Pause"  onclick="still_click(this)"></td><td>

</tr></table>

</form></BODY></HTML>

- Enable the JPEG/MPEG-4 frame size that you want in Encoding page of VN-V686.

- Start Multicast stream on VN-V686 Web page to use Multicast. The ActiveX does not send request to 

VN-V686 for starting Multicast stream.

- Set unique Multicast address and port to each Multicast stream if multiple multicast streams are 

required.

(1) Low Frame rate due to long delay of network

- Causes of Low Frame Rate

During transmission via TCP, VN-V686 sends out the following data by receiving the Ack of TCP. When network 

delay is long, reception of Ack will be delayed and sending rate will drop. This therefore leads to a drop in the frame 

rate.

- Countermeasure

This problem can be avoided by receiving via multicast. Multicast uses UDP and Ack does not exist. As such, the 

sender will be able to continue sending without being affected by network delays.

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