Specifications

Figure 28 illustrates the record client (PCM-7130) and a record server

(Linux) using the TCP/IP protocol stack. The client and server each interact

with a protocol in the socket layer of the stack.

The procedure of the client images saving to record server when auto

recode is issued.

1. The client process logins on the record server

The client first connects to record server program using socket interface,

the server subsequently identifies the client rights that responses the ‘Login’

and ‘Password’ command to the client, if the username and password are

correct whose the client sent then the server identify is okay or the server

would break down the connection.

2. YUV convert to JPEG in client

The first image type is YUV cause of the M318B camera, and the file

size is too bigger for YUV image to send. The YUV image files therefore

need to reduce size with compressed, hence the compressed image has many

file type, ex. avi, mpg, jpg … etc, and the jpg encoder is wonder for the

others as the compressive performance of PCM-7130. PCM-7130 applied

jpeg encoder with JPEG Group’s ‘jpeglib’ which is ISO JPEG standard and

more convenient to use.

3. The client process sends the jpeg stream to the record server

The client process would send the jpeg stream to record server after the

jpeg image file is ready, if the client process wants to finish the streaming,

then it can sent ‘Quit’ command or break down connection by directly.

4. The server stores the jpeg stream

The server process gets the jpeg stream from the client via internet, the

server then save the jpeg files in a directory and make a sequent name with

its.

5. JPEG convert to 3gp (third generation video) format video file to FTP

directory using FFmpeg

The server would back to listen mode for waiting the connection with

client when the connection is broke, in the same time the server invokes the

FFmpeg program in background to encode the jpeg stream (which obtained

by step 4) to a video file for the users watching it. FFmpeg is a very fast

video and audio converter, and it supports many video and audio codec. The