Bosch Building Technologies

    cancel
    Showing results for 
    Search instead for 
    Did you mean: 

    Which is the recommended I-Frame distance when using 3rd party Software or Bosch-VSG?

    Question

     

    Which is the proper I-Frame distance used in 3rd party Software?

     

    Answer

     

    “GOP” (Group of Pictures) also known as “I-Frame distance“ is the I-Frame refreshment interval

     

    Nowadays the Bosch encoders support long Fixed GOP lengths , up to 250.
    Some 3rd party management software like e.g. “Genetec” or “Cathexis” etc. can set these large GOP lengths ones these get assigned to the management system.
    But also, of course, through the Bosch interface this can be configured.

    Note: 

    When dealing with 3rd party or VSG, it’s recommended to get at-least "1" I-frame every second (normal scene).


    What Is the concern?

    With large GOP lengths the image quality potentially can suffer and degrade dramatically due to lag of I-Frames specially when the camera frame rate (encoder interval) is also set low.

    When you only look to static scenes large GOP lengths could be useful.
    But for dynamic scenes or with the usage of Autodome cameras it recommended to use a GOP30 or better.
    Rule of thumb set the GOP length equal to the frame-rate, this result in "1" I-frame every second

     

    Example of bad config:
    * Camera frame-rate is 10fps
    * IP-GOP 250 (means you will receive each time a new I-frame after 249 P-frames (IP-GOP structure).
    * so I receive an I-frame 250/10=every 25sec (0.04-frame per sec)

    Which is the recommended I-Frame distance when using 3rd party Software or Bosch-VSG.png

    Version history
    Revision #:
    2 of 2
    Last update:
    ‎10-26-2021 11:22 AM
    Updated by:
     
    Labels (6)
    Contributors
    Icon--AD-black-48x48Icon--address-consumer-data-black-48x48Icon--appointment-black-48x48Icon--back-left-black-48x48Icon--calendar-black-48x48Icon--center-alignedIcon--Checkbox-checkIcon--clock-black-48x48Icon--close-black-48x48Icon--compare-black-48x48Icon--confirmation-black-48x48Icon--dealer-details-black-48x48Icon--delete-black-48x48Icon--delivery-black-48x48Icon--down-black-48x48Icon--download-black-48x48Ic-OverlayAlertIcon--externallink-black-48x48Icon-Filledforward-right_adjustedIcon--grid-view-black-48x48IC_gd_Check-Circle170821_Icons_Community170823_Bosch_Icons170823_Bosch_Icons170821_Icons_CommunityIC-logout170821_Icons_Community170825_Bosch_Icons170821_Icons_CommunityIC-shopping-cart2170821_Icons_CommunityIC-upIC_UserIcon--imageIcon--info-i-black-48x48Icon--left-alignedIcon--Less-minimize-black-48x48Icon-FilledIcon--List-Check-grennIcon--List-Check-blackIcon--List-Cross-blackIcon--list-view-mobile-black-48x48Icon--list-view-black-48x48Icon--More-Maximize-black-48x48Icon--my-product-black-48x48Icon--newsletter-black-48x48Icon--payment-black-48x48Icon--print-black-48x48Icon--promotion-black-48x48Icon--registration-black-48x48Icon--Reset-black-48x48Icon--right-alignedshare-circle1Icon--share-black-48x48Icon--shopping-bag-black-48x48Icon-shopping-cartIcon--start-play-black-48x48Icon--store-locator-black-48x48Ic-OverlayAlertIcon--summary-black-48x48tumblrIcon-FilledvineIc-OverlayAlertwhishlist