In Broadcast - April 2012 - 48
WWW.INBROADCAST.COM | ISSUE 7 - APRIL 2012
InREPLY
Renaud Desportes, Director of Wohler’s Ancillary Data Management Product Line addresses the question of subtitling content challenges
Renaud Desportes
48
Mandates from industry regulators worldwide are requiring a growing number of broadcasters and other distributors of programming – to provide a minimum number of hours of subtitled programming per day, week, or calendar quarter. Though there is no one, uniformly adopted standard for subtitling across Europe, the Middle East, and Africa, broadcasters across these regions face similar challenges in handling subtitling data within their internal workflows for media distribution, contribution, and recording. While these broadcasters must ensure that their facilities encode and output programming that adheres to the different subtitling standards – such as WST, OP47, and SMPTE2031-based WST governing their broadcasts, they can implement similar internal models for inserting, extracting, and otherwise handling subtitling data efficiently and accurately across the transmission chain. Four fundamental challenges face broadcasters that work with subtitling content. The first of these is the development of an effective subtitling production workflow for subtitles prepared in advance of the broadcast, as well as those generated for live events. In addressing requirements regarding the delivery of subtitling within digital television services, broadcasters can choose from two subtitle production models. Larger broadcast networks typically establish in-house services, with staff at dedicated workstations performing offline captioning and live captioning for news, sports and other live events. A second fundamental challenge is the storage of subtitling information along with the broadcaster’s media assets. In addressing this challenge, the broadcaster must determine the stage at which to encode subtitles, taking into account distribution, contribution, and recording of live events for later re-playout and direct broadcast. Wohler has addressed this issue with its HDCC Series captioning / subtitling cards, which offer complete, independent dual-
A subtitler at work
channel operation for encoding, decoding and monitoring of subtitles for every major global standard. Within a streamlined workflow, the subtitling system – also called an inserter – encodes actual subtitle data and associated control data into the video signal, ensuring compliance with required standards, as well as integrity with the video signal. A subtitle management system ensures interconnection and interaction with the subtitle data sources, handles incoming subtitle data files or streams, and interfaces with the playout automation system, the MAM, and the playlist management system, so that the required subtitle data is loaded and played out in sync with the video time code, or that the live captioning source is connected in time. Because subtitle data is not encoded within the video file, the subtitle data file can be delivered to the broadcaster or altered / corrected at any moment prior to
the actual playout. In some cases, subtitle processing is performed at the ingest stage, with subtitles embedded into files that eventually will be transformed into a broadcast. Assuming the in-house video file format and wrapper can carry ancillary data including subtitle data, such as MXF, the MAM system can handle audio, video, and related subtitle data as a single asset, in turn simplifying management and movement throughout the rest of the workflow. The limitation of this approach is that it fails to provide for live subtitling and the need to record live programmes along with synced captions for later re-broadcast. Thus, a hybrid approach would be necessary to accommodate both prepared and live subtitles effectively. The flexibility of the subtitling system helps broadcasters address a third challenge: future-proofing and optimising their investments in subtitle-management equipment. With the industry’s
ongoing transition to DTV and HD operations, as well as the move into multiplatform distribution via new outlets, broadcasters need solutions that can evolve along with their operations. For broadcasters delivering programming concurrently in HD and SD, a dual-channel subtitle inserter can handle encoding both in SD and HD at once. With this model, the broadcaster can employ a single-format (SD or HD) video storage and playout server architecture and implement an up or down converter before the inserter to feed the inserter’s second channel. Pre-encoded subtitle data from within the native video SDI stream would be copied and transcoded on the fly by the inserter to the up or down converted SDI stream that goes through its second channel. The inserter thus enables the broadcaster to encode and insert live or external file-based captions in both SD and HD streams simultaneously. Finally, the fourth central challenge for broadcasters is addressing subtitling for VOD and Web-based programme delivery. This process involves different formats, different video and audio encoding processes, different asset management systems, and different ways of making captions available. This also presents the difficulty of accommodating added delay introduced by the encoding of streaming media. In summary, the insertion of subtitles into the broadcast signal can be a complicated process, but flexible subtitling solutions go far in simplifying this small yet critical aspect of a facility’s operations. ■
Subtitle workflow
http://www.linkedin.com/home?trk=hb_tab_home_top
http://www.twitter.com/inbroadcast
http://www.youtube.com/watch?v=qpzEatLsHdE&feature=youtube_gdata_player
http://www.facebook.com/pages/InBroadcast-e-zine/226166444076212
http://itunes.apple.com/gb/app/inbroadcast/id468652679?mt=8
http://WWW.INBROADCAST.COM
http://www.wohler.com/
In Broadcast - April 2012
Table of Contents for the Digital Edition of In Broadcast - April 2012
In Broadcast - April 2012
Contents
Broadcast Networks Delivers for Arqiva
Swedish Hockey Safe in the Bank
Viewcast Launches Niagara 9100 Series
Cavena: Enhancing the Value of Content
Broadcast Pix Announces Video Control Center 3.0
Telecast’s Latest Innovations
Glidecam Introduces XR-Series Stabilisers
Qvest Media Live With Code One Streaming
Volicon Extends Observer Utility
Petrol Bags Add to Audio & DSLR Range
In Broadcast - April 2012 - In Broadcast - April 2012
In Broadcast - April 2012 - Cover2
In Broadcast - April 2012 - Contents
In Broadcast - April 2012 - Broadcast Networks Delivers for Arqiva
In Broadcast - April 2012 - 5
In Broadcast - April 2012 - Swedish Hockey Safe in the Bank
In Broadcast - April 2012 - 7
In Broadcast - April 2012 - 8
In Broadcast - April 2012 - 9
In Broadcast - April 2012 - 10
In Broadcast - April 2012 - 11
In Broadcast - April 2012 - 12
In Broadcast - April 2012 - 13
In Broadcast - April 2012 - 14
In Broadcast - April 2012 - 15
In Broadcast - April 2012 - 16
In Broadcast - April 2012 - 17
In Broadcast - April 2012 - 18
In Broadcast - April 2012 - 19
In Broadcast - April 2012 - 20
In Broadcast - April 2012 - 21
In Broadcast - April 2012 - Viewcast Launches Niagara 9100 Series
In Broadcast - April 2012 - 23
In Broadcast - April 2012 - 24
In Broadcast - April 2012 - 25
In Broadcast - April 2012 - 26
In Broadcast - April 2012 - Cavena: Enhancing the Value of Content
In Broadcast - April 2012 - 28
In Broadcast - April 2012 - 29
In Broadcast - April 2012 - 30
In Broadcast - April 2012 - 31
In Broadcast - April 2012 - 32
In Broadcast - April 2012 - 33
In Broadcast - April 2012 - 34
In Broadcast - April 2012 - 35
In Broadcast - April 2012 - 36
In Broadcast - April 2012 - 37
In Broadcast - April 2012 - Broadcast Pix Announces Video Control Center 3.0
In Broadcast - April 2012 - 39
In Broadcast - April 2012 - 40
In Broadcast - April 2012 - 41
In Broadcast - April 2012 - 42
In Broadcast - April 2012 - 43
In Broadcast - April 2012 - 44
In Broadcast - April 2012 - 45
In Broadcast - April 2012 - 46
In Broadcast - April 2012 - 47
In Broadcast - April 2012 - 48
In Broadcast - April 2012 - 49
In Broadcast - April 2012 - 50
In Broadcast - April 2012 - 51
In Broadcast - April 2012 - 52
In Broadcast - April 2012 - 53
In Broadcast - April 2012 - Telecast’s Latest Innovations
In Broadcast - April 2012 - 55
In Broadcast - April 2012 - Glidecam Introduces XR-Series Stabilisers
In Broadcast - April 2012 - 57
In Broadcast - April 2012 - 58
In Broadcast - April 2012 - 59
In Broadcast - April 2012 - 60
In Broadcast - April 2012 - 61
In Broadcast - April 2012 - 62
In Broadcast - April 2012 - Qvest Media Live With Code One Streaming
In Broadcast - April 2012 - 64
In Broadcast - April 2012 - 65
In Broadcast - April 2012 - Volicon Extends Observer Utility
In Broadcast - April 2012 - 67
In Broadcast - April 2012 - 68
In Broadcast - April 2012 - 69
In Broadcast - April 2012 - Petrol Bags Add to Audio & DSLR Range
In Broadcast - April 2012 - Cover3
In Broadcast - April 2012 - Cover4
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202410
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202409
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202408
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202407
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202406
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202405
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202404
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202403
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202402
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202401
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202312
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202311
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202310
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202309
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202308
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202307
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202306
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202305
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202304
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202303
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202302
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202301
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202212
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202211
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202210
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202209
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202208
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202207
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202206
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202205
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202204
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202203
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202202
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202201
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202112
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202111
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202110
https://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202109
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202108
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202107
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202106
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202105
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_PTZ
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202104
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202103
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202102
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202101
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202012
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202011
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202010
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202009
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202008
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202007
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202006
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202005
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202004
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202003
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202002
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_202001
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_INREVIEW2019
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201912
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201911
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NewYork2019
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201910
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201909
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_inshowguide2019
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201908
http://europe.nxtbook.com/nxteu/lesommet/CTA-DAY3
http://europe.nxtbook.com/nxteu/lesommet/CTA-DAY2
http://europe.nxtbook.com/nxteu/lesommet/CTA-DAY1
http://europe.nxtbook.com/nxteu/lesommet/CTA-VISITOR
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201906
http://europe.nxtbook.com/nxteu/lesommet/CTA-PREVIEW
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201905
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201904
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOW2019
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201903
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_cabsat2019
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201902
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201901
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_INREVIEW2018
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201812
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201811
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NewYork2018
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201810
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_inshowguide2018
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201809
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201808
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201806
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201805
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201804
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOW2018
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201803
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201802
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_cabsat2018
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201801
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201712
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201711
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201710
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOWNYexpo2017
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201709
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_inshowguide2017
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201708
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201707
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201705
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOW2017
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201704
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_cabsat2017
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201703
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201702
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201701
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_INREVIEW2016
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201612
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201611
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOWNYexpo
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_20110708_DEMO
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201610
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_inshowguide2016
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201609
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201608
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201607
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201606
http://europe.nxtbook.com/nxtbooks/lesommet/inbroadcast_APAC03
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201605
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOW2016
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201604
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201603
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_cabsat2016
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201602
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201601
https://www.nxtbook.com/nxtbooks/lesommet/inbroadcast_APAC02
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201512
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201511
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_CCW15expo
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201510
https://www.nxtbook.com/nxtbooks/lesommet/inbroadcast_APAC01
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201509
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_IBC2015
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201508
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201507
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201506
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_BROADCASTASIA2015
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201505
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201504
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOW2015
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201503
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_cabsat2015
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201502
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201501
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201412
https://www.nxtbook.com/nxteu/lesommet/inbroadcast_201411
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201410
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201409
http://europe.nxtbook.com/nxteu/lesommet/inbroadcastIBCPRINTEDGUIDE_201409
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201408
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201407
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201406
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201405
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201404
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201403
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201402
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201401
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201312
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201311
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201310
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201309
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201308
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201307
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201306
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201305
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201304
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201303
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201302
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201301
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201211
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201210
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201209
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201208
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201207
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201206
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201205
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201204
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201203
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201202
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_20121201
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_20111011
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_20110708
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_20110506
https://www.nxtbookmedia.com