Jvc 4ch Network Encoder VN-E4 Manual do Utilizador Página 7
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1. Acquiring JPEG from VN-E4 via HTTP _ 1.3. Response
When API is successfully received
VN-E4 will return 200 OK. Content-length indicates file size of first JPEG in bytes. The x-vne4_response line indicates current values of all
parameters used for JPEG encoding.
Example HTTP/1.1 200 OK<CRLF>
Connection: Keep-Alive<CRLF>
Content-Length: 27616<CRLF>
Content-Type: image/jpeg<CRLF>
Date: Fri, 13 MAY 2005 07:33:12 GMT<CRLF>
Server: VN-E4 Jpeg & Audio Server/1.0.0<CRLF>
Keep-Alive: timeout=5, max=5<CRLF>
x-vne4_response:
input=1&framesize=vga&framerate=30&header=0&assured=0&sendbuffer=16<CRLF>
<CRLF>
When VN-E4 fails to realize the requested frame rate
Depending on the frame rate settings of VN-E4, transmission may not be possible at the frame rate requested by API. For example, when VN-
E4 is set to 15 fps, transmission will only be possible at 15 fps even if the client requests for 30 fps. When VN-E4 is set to 15 fps and 10 fps is
requested by the client, transmission will be carried out at 7.5 fps to enable transmission at equal time intervals.
The actual transmission frame rate is stated in the x-vne4_response line.
Example HTTP/1.1 206 Partial Content<CRLF>
Connection: Keep-Alive<CRLF>
Content-Length: 27616<CRLF>
Content-Type: image/jpeg<CRLF>
Date: Fri, 13 MAY 2005 07:33:12 GMT<CRLF>
Server: VN-E4 Jpeg & Audio Server/1.0.0<CRLF>
Keep-Alive: timeout=5, max=5<CRLF>
x-vne4_response:
input=1&framesize=vga&framerate=15&header=0&assured=0&sendbuffer=16<CRLF>
<CRLF>
Frame rate encoded by VN-E4 can be changed using the web setting page or API for setting. Frame rate of data
that are currently being transmitted will remain unchanged even if the frame rate to encode is increased. When
the frame rate to encode is reduced, however, this value will become the upper limit of the transmission frame
rate.
When the specified input channel and frame size are not available
For example, when QVGA encoding of CH4 is set to off at VN-E4, transmission will fail if the client requests for QVGA of CH4. When this
occurs, VN-E4 will return an error response together with a PNG file. "Not Encoded" image is written in the PNG file.
Example HTTP/1.1 456 Header Field Not Valid for Resource<CRLF>
Connection: Keep-Alive<CRLF>
Content-Length: 27616<CRLF>
Content-Type: image/png<CRLF>
Date: Fri, 13 MAY 2005 07:33:12 GMT<CRLF>
Server: VN-E4 Jpeg & Audio Server/1.0.0<CRLF>
Keep-Alive: timeout=5, max=5<CRLF><CRLF>
(This is followed by a PNG file which includes the "Not Encoded" message.)
1.3. Response
- 4ch Network Encoder 1
- 1.1. Basic Procedures 5
- 1.2. API Format 6
- 1.3. Response 7
- 1.4. Restrictions 8
- 2.1. Basic Procedures 10
- 2.2. API Format 11
- 2.3. Response 12
- 2.4. Restrictions 13
- 3.1 Procedure 14
- 3.2. Restrictions 15
- 4.1. Procedure 16
- 4.2. Restrictions 17
- 5.1. Explanatory Notes 18
- 5.2. Signal Input 19
- Setting Brightness for VN-E4 20
- Acquiring Contrast from VN-E4 20
- Setting Contrast for VN-E4 20
- Setting Saturation for VN-E4 21
- Acquiring Phase from VN-E4 21
- Setting Phase for VN-E4 21
- Acquiring Turnover from VN-E4 21
- 5.3. JPEG Encoding 23
- Setting File Size for VN-E4 25
- 5.4. Alarm Setting 27
- 5.6. Motion Detect 37
- 5.7. Serial Port 40
- 5.8. Network Basics 43
- Setting IP Address for VN-E4 44
- Setting Subnet Mask for VN-E4 44
- Setting Host Name for VN-E4 45
- 5.9. Network Details 49
- Setting MTU Value for VN-E4 50
- 5.10. Manual Transmission 52
- 5.11. Access Restrictions 53
- 5.12. Time 56
- _ 5.12. Time 57
- 5.13. Password 59
- 5.14. Maintenance 60
- 5.15. Acquiring Status 61
- Acquiring Log 62
- 5.16. Acquiring Settings 63
- 5.17. Others 64
- 6.1. Procedure 65
- 6.2. List of APIs 66
- 7.1. Audio Receiving via HTTP 69
- 7.2. Audio Receiving via RTP 70
- (1) Pan Control 71
- (2) Tilt Control 71
- (3) Iris Control 72
- (4) Focus Control 72
- (5) Zoom Control 72
- 8.2. Control 73
- (3) Sending Pass-through Data 74
- (4) Ending Pass-through 74
- 10. Advanced Topics 76
- (1) HTML Sample 77
- VN-E4 API GUIDE 80
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