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- Active_Format_Description abstract "In television technology, Active Format Description (AFD) is a standard set of codes that can be sent in the MPEG video stream or in the baseband SDI video signal that carries information about their aspect ratio and active picture characteristics. It has been used by television broadcasters to enable both 4:3 and 16:9 television sets to optimally present pictures transmitted in either format. It has also been used by broadcasters to dynamically control how down-conversion equipment formats widescreen 16:9 pictures for 4:3 displays. Standard AFD codes provide information to video devices about where in the coded picture the active video is and also the "protected area" which is the area that needs to be shown. Outside of the protected area, edges at the sides or the top can be removed without the viewer missing anything significant. Video decoders and display devices can then use this information, together with knowledge of the display shape and user preferences, to choose a presentation mode.AFD can be used in the generation of Widescreen signaling, although MPEG alone contains enough information to generate this. AFDs are not part of the core MPEG standard; they were originally developed within the Digital TV Group in the UK and submitted to DVB as an extension, which has subsequently also been adopted by ATSC (with some changes). SMPTE has also adopted AFD for baseband SDI carriage as standard SMPTE 2016-1-2007, "Format for Active Format Description and Bar Data".Active Format Description is occasionally incorrectly referred to as "Active Format Descriptor". There is no "descriptor" (descriptor has a specific meaning in ISO/IEC 13818-1, MPEG syntax). The AFD data is carried in the Video Layer of MPEG, ISO/IEC 13818-2. When carried in digital video, AFDs can be stored in the Video Index Information, in line 11 of the video.By using AFDs broadcasters can also control the timing of Aspect Ratio switches more accurately than using MPEG signalling alone. This is because the MPEG signalling can only change with a new Group of Pictures in the sequence, which is typically around every 12 frames or half a second - this was not considered accurate enough for some broadcasters who were initially switching frequently between 4:3 and 16:9. The number of Aspect Ratio Converters required in a broadcast facility is also reduced, since the content is described correctly it does not need to be resized for broadcast on a platform that supports AFDs.In 2012, a Technology & Engineering Emmy Award was awarded for the development and deployment of Active Format Description.".
- Active_Format_Description wikiPageExternalLink Report_WorkItem.asp?WKI_ID=21480.
- Active_Format_Description wikiPageExternalLink afd.
- Active_Format_Description wikiPageID "4666541".
- Active_Format_Description wikiPageLength "9327".
- Active_Format_Description wikiPageOutDegree "30".
- Active_Format_Description wikiPageRevisionID "670692249".
- Active_Format_Description wikiPageWikiLink 14:9.
- Active_Format_Description wikiPageWikiLink 16:9.
- Active_Format_Description wikiPageWikiLink 4:3.
- Active_Format_Description wikiPageWikiLink Advanced_Television_Systems_Committee.
- Active_Format_Description wikiPageWikiLink Aspect_ratio_(image).
- Active_Format_Description wikiPageWikiLink Category:Broadcast_engineering.
- Active_Format_Description wikiPageWikiLink Category:Digital_television.
- Active_Format_Description wikiPageWikiLink Category:Film_and_video_technology.
- Active_Format_Description wikiPageWikiLink Category:Television_technology.
- Active_Format_Description wikiPageWikiLink DTV_transition_in_the_United_States.
- Active_Format_Description wikiPageWikiLink Digital_TV_Group.
- Active_Format_Description wikiPageWikiLink Digital_Video_Broadcasting.
- Active_Format_Description wikiPageWikiLink Digital_television.
- Active_Format_Description wikiPageWikiLink Digital_television_transition_in_the_United_States.
- Active_Format_Description wikiPageWikiLink Letterbox.
- Active_Format_Description wikiPageWikiLink Letterboxing_(filming).
- Active_Format_Description wikiPageWikiLink Moving_Picture_Experts_Group.
- Active_Format_Description wikiPageWikiLink Pillarbox.
- Active_Format_Description wikiPageWikiLink Serial_Digital_Interface.
- Active_Format_Description wikiPageWikiLink Serial_digital_interface.
- Active_Format_Description wikiPageWikiLink Shoot_and_protect.
- Active_Format_Description wikiPageWikiLink Society_of_Motion_Picture_and_Television_Engineers.
- Active_Format_Description wikiPageWikiLink Technology_&_Engineering_Emmy_Award.
- Active_Format_Description wikiPageWikiLink Television.
- Active_Format_Description wikiPageWikiLink Widescreen.
- Active_Format_Description wikiPageWikiLink Widescreen_signaling.
- Active_Format_Description wikiPageWikiLink Windowbox_(film).
- Active_Format_Description wikiPageWikiLink File:AFDChart.png.
- Active_Format_Description wikiPageWikiLinkText "#10 AFD code".
- Active_Format_Description wikiPageWikiLinkText "AFD #10".
- Active_Format_Description wikiPageWikiLinkText "AFD #8 code".
- Active_Format_Description wikiPageWikiLinkText "AFD".
- Active_Format_Description wikiPageWikiLinkText "Active Format Description".
- Active_Format_Description wikiPageWikiLinkText "forced framing to letterboxing".
- Active_Format_Description hasPhotoCollection Active_Format_Description.
- Active_Format_Description wikiPageUsesTemplate Template:More_footnotes.
- Active_Format_Description wikiPageUsesTemplate Template:Reflist.
- Active_Format_Description wikiPageUsesTemplate Template:Video_formats.
- Active_Format_Description subject Category:Broadcast_engineering.
- Active_Format_Description subject Category:Digital_television.
- Active_Format_Description subject Category:Film_and_video_technology.
- Active_Format_Description subject Category:Television_technology.
- Active_Format_Description hypernym Set.
- Active_Format_Description type Article.
- Active_Format_Description type Article.
- Active_Format_Description type Discipline.
- Active_Format_Description comment "In television technology, Active Format Description (AFD) is a standard set of codes that can be sent in the MPEG video stream or in the baseband SDI video signal that carries information about their aspect ratio and active picture characteristics. It has been used by television broadcasters to enable both 4:3 and 16:9 television sets to optimally present pictures transmitted in either format.".
- Active_Format_Description label "Active Format Description".
- Active_Format_Description sameAs Active_Format_Description.
- Active_Format_Description sameAs 액티브_포맷_디스크립션.
- Active_Format_Description sameAs m.047gqbd.
- Active_Format_Description sameAs Active_Format_Description.
- Active_Format_Description sameAs Q857787.
- Active_Format_Description sameAs Q857787.
- Active_Format_Description wasDerivedFrom Active_Format_Description?oldid=670692249.
- Active_Format_Description isPrimaryTopicOf Active_Format_Description.