Difference between revisions of "Video API Extensions legacy"

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m (Reverted edit of 84.9.45.94, changed back to last version by Alexlp)
m (Reverted edit of Khlut, changed back to last version by 84.9.45.94)
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{{en|ru=Video_API_Extensions.Ru|cn=Video_API_Extensions.cn}}
 
{{en|ru=Video_API_Extensions.Ru|cn=Video_API_Extensions.cn}}
  
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Given realization of Video API has a number of opportunities which are absent in standard Axis Video API.
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The current implementation of the Video API has a number of features which are absent from the standard Axis Video API.
  
  
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== Extensions enabling ==
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== Enabling extensions ==
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By default the Video API extensions are blocked. For unblocking it is necessary to set a corresponding variable:
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By default the Video API extensions are blocked. To unblock them it is necessary to set a corresponding variable:
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ElphelExtensions.Enabled=yes</nowiki>
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ElphelExtensions.Enabled=yes</nowiki>
  
  
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== Obtaining of static and dynamic images ==
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== Obtaining static and dynamic images ==
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The standard interface for the static and dynamic images obtaining in JPEG and MJPG formats is have a few additional parameters.
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The standard interface for obtaining static and dynamic images in JPEG and MJPG formats has a few additional parameters.
  
 
{| border="0" cellpadding="2"
 
{| border="0" cellpadding="2"
 
|-
 
|-
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|e_dcm_hor ||-|| horisontal decimation (resolution/image size reduction)
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|e_dcm_hor ||-|| horizontal decimation (resolution/image size reduction)
 
|-
 
|-
 
|e_dcm_vert ||-|| vertical decimation (resolution/image size reduction)
 
|e_dcm_vert ||-|| vertical decimation (resolution/image size reduction)
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=== Examples ===
 
=== Examples ===
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Example of the static image obtaining with using the next parameters:
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Example of obtaining a static image - use the following parameters:
 
  <nowiki>http://192.168.0.9/axis-cgi/jpg/image.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600</nowiki>
 
  <nowiki>http://192.168.0.9/axis-cgi/jpg/image.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600</nowiki>
  
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Example of the dynamic image (MPJPG) obtaining with using the next parameters:
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Example of obtaining a dynamic image (MJPG) - use the following parameters:
  
 
  <nowiki>http://192.168.0.9/axis-cgi/mjpg/video.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600</nowiki>
 
  <nowiki>http://192.168.0.9/axis-cgi/mjpg/video.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600</nowiki>
  
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You can play this videostream, for example, by using the MPlayer (more detailed description see at [[Using Mplayer With Video API]]):
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You can play this videostream, for example, by using MPlayer (for a more detailed description see [[Using Mplayer With Video API]]):
  
 
  <nowiki>$mplayer -demuxer lavf "http://192.168.0.9/axis-cgi/mjpg/video.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600&bogus.mjpg"</nowiki>
 
  <nowiki>$mplayer -demuxer lavf "http://192.168.0.9/axis-cgi/mjpg/video.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600&bogus.mjpg"</nowiki>
  
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If any from parameters is not specified, the default values are used. You can find these values at the address:
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If any of the parameters are not specified, the default values are used. You can find these values at the address:
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.Sensor</nowiki>
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.Sensor</nowiki>
 
'''Note''': All API extensions have the prefix "E_".
 
'''Note''': All API extensions have the prefix "E_".
  
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You can change the default value by standard way for Axis Video API. For example:
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You can change the default value in the standard way for the Axis Video API. For example:
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_DcmHor=1</nowiki>
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_DcmHor=1</nowiki>
  
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== Obtaining the information about the system condition and default values ==
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== Obtaining information about the system status and default values ==
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For obtaining the information about the system condition variable you must use the next path:
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To obtain information about the system status variable you must use the following path:
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState</nowiki>
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState</nowiki>
  
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In an addition to the obtaining of the standard "'''rfc'''" format there is the obtaining in XML format also. You must use the '''responseformat''' parameter for it. For example:
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In an addition to the standard "'''rfc'''" format there is also the possibility to use XML format. You must use the '''responseformat''' parameter for this. For example:
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState&responseformat=xml</nowiki>
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState&responseformat=xml</nowiki>
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'''Note'''. If the responseformat not specified or specified incorrect, will be used the default value of '''"rfc".'''
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'''Note'''. If the responseformat is not specified or specified incorrectly, the default value of '''"rfc" will be used.'''
  
  
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== Video streaming RTP/MJPG and RTP/Theora ==
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== Video streaming: RTP/MJPG and RTP/Theora ==
 
The Elphel cameras can transfer the video stream by RTP protocol.
 
The Elphel cameras can transfer the video stream by RTP protocol.
 
=== RTP/MJPG ===
 
=== RTP/MJPG ===
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== Exposure control ==
 
== Exposure control ==
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The Elphel cameras support the standard and advanced exposure control interface. About the standard settings see [[Video_API]]
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The Elphel cameras support the standard and advanced exposure control interface. For the standard settings see [[Video_API]]
  
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For autoexposure enabling is necessary to use the following command:
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To enable autoexposure it is necessary to use the following command:
  
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.Exposure=auto</nowiki>
 
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.Exposure=auto</nowiki>

Revision as of 14:26, 28 December 2005

in English | [[{{{de}}}|deutsch]] | [[{{{fr}}}|français]] | по-русски | автоперевод | 中文版 | 机械翻译


The current implementation of the Video API has a number of features which are absent from the standard Axis Video API.


Enabling extensions

By default the Video API extensions are blocked. To unblock them it is necessary to set a corresponding variable: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ElphelExtensions.Enabled=yes


Obtaining static and dynamic images

The standard interface for obtaining static and dynamic images in JPEG and MJPG formats has a few additional parameters.

e_dcm_hor - horizontal decimation (resolution/image size reduction)
e_dcm_vert - vertical decimation (resolution/image size reduction)
e_bin_hor - horizontal binning (sensitivity for lower resolution)
e_bin_vert - vertical binning (sensitivity for lower resolution)
e_woi_width - sensor active window width (before decimation)
e_woi_height - sensor active window height (before decimation)
e_woi_left - sensor active window left margin (before decimation)
e_woi_top - sensor active window top margin (before decimation)
e_virt_width - virtual frame width
e_virt_height - virtual frame height
e_fliph - flip (mirror) image horizontally (uses in-sensor capabilities)
e_flipv - flip (mirror) image vertically (uses in-sensor capabilities)
e_quality - JPEG Quality (%)

Examples

Example of obtaining a static image - use the following parameters: 

http://192.168.0.9/axis-cgi/jpg/image.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600

Example of obtaining a dynamic image (MJPG) - use the following parameters: 

http://192.168.0.9/axis-cgi/mjpg/video.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600

You can play this videostream, for example, by using MPlayer (for a more detailed description see Using Mplayer With Video API): 

$mplayer -demuxer lavf "http://192.168.0.9/axis-cgi/mjpg/video.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600&bogus.mjpg"

If any of the parameters are not specified, the default values are used. You can find these values at the address: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.Sensor

Note: All API extensions have the prefix "E_".

You can change the default value in the standard way for the Axis Video API. For example: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_DcmHor=1

Obtaining information about the system status and default values

To obtain information about the system status variable you must use the following path: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState

In an addition to the standard "rfc" format there is also the possibility to use XML format. You must use the responseformat parameter for this. For example: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState&responseformat=xml

Note. If the responseformat is not specified or specified incorrectly, the default value of "rfc" will be used.


Video streaming: RTP/MJPG and RTP/Theora

The Elphel cameras can transfer the video stream by RTP protocol.

RTP/MJPG

RTP/Theora

Exposure control

The Elphel cameras support the standard and advanced exposure control interface. For the standard settings see Video_API

To enable autoexposure it is necessary to use the following command: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.Exposure=auto

Enabling the manual control of exposure: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.Exposure=manual

Obtaining the exposure state: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState.E_Exposure

Window settings: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_Exposure.E_WinWidth=30&ImageSource.I0.Sensor.E_Exposure.E_WinHeight=45&ImageSource.I0.Sensor.E_Exposure.E_WinLeft=10&ImageSource.I0.Sensor.E_Exposure.E_WinTop=20

Exposure max.values: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_Exposure.E_Max=3000&ImageSource.I0.Sensor.E_Exposure.E_OverMax=30
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