In Broadcast - December 2011/January 2012 - 92


WWW.INBROADCAST.COM | DECEMBER 2011/JANUARY 2012

InFILE Transcoding: Getting There Faster
By John Pallett, Telestream Director of Product Marketing
The ongoing extension of digital video into new realms has brought with it a proliferation of specialised c o m p re s s i o n / d e c o m p re s s i o n algorithms (codecs), some used for content acquisition, others for editing and post-production, still others for storage and archiving, and still more for delivery to viewers on everything from big-screen TVs to mobile devices. Because content is increasingly used in a multitude of settings, it is become ever more important to be able to move it efficiently from one digital format to another without degrading its quality. Simply put, that is the purpose of transcoding. Transcoding allows programs to be converted from codec to codec faster than realtime using standard IT hardware rather than more costly video routers and switches. And it facilitates automation because it avoids manual steps such as routing signal or transporting storage media. Intelligently implemented and managed, transcoding vastly improves throughput while preserving quality. In many cases transcoding is required between file formats because of the codecs they support and the amount of compression applied to elementary video and audio streams. Those factors are determined by the purposes for which various codecs are defined, which, for video, fall into the following general categories: • Editing applications typically use formats (eg DV, Apple ProRes, Avid DNxHD, Sony IMX) that involve only intra-frame compression, resulting in video streams comprised entirely of I-frames, which can each be decompressed independently. The quality of the source is maintained and the material is easy to seek and edit on individual frames, but resulting bitrates are high. • Archiving applications also require high quality, such as JPEG 2000 or DV video elementary streams within a QuickTime or AVI container. But reducing storage requirements is often a higher priority than maintaining independent access to every frame, so inter-frame compression may be applied, typically using long-GOP (15frame) formats such as MXFwrapped MPEG-2 at 36 Mbps or higher.
John Pallett

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• Broadcast server formats are designed for use with proprietary systems, such as the Grass Valley K2, Omneon Media Stream, or Harris Nexio, that serve as the source from which stations pull programme for the feed to the broadcast transmitter or cable signal distribution system. Suitability for editing is not a requirement, so video compression is typically longGOP MPEG-2 and increasingly H.264. • Distribution is a diverse category covering everything from CableLabs MPEG-2 transport streams for video on demand (VOD) to adaptive streaming formats (Apple HLS, Microsoft Smooth Streaming, Adobe HDS) for “new media” distribution via desktop or mobile device. A single container may include streams of different bitrates and resolutions. H.264 is a common video codec for this application. • Proxy formats are small, highlycompressed stand-ins for full-quality source files, used by stock footage libraries for online viewing and by editors when finding takes outside of an editing suite. Since the priority is to make the files small, proxies typically use lossy inter-frame video compression. The need for efficient media exchange between these diverse types of formats is clear. Transcoding bridges the gaps between production,
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MERlin DVB-T2 and DVB-T terrestrial monitoring receiver

• DVB-T2 & DVB-T terrestrial COFDM to DVB-ASI • SNMP interface • Web browser A 1RU self-contained terrestrial receiver for continuous off-air reception and monitoring of DVB-T2 and DVB-T. The unit monitors key parameters such as MER and LDPC and includes programmable templates to compare the received RF with the expected signal. MERlin is extremely cost effective enabling wide scale deployment.

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Table of Contents for the Digital Edition of In Broadcast - December 2011/January 2012

In Broadcast - December 2011/January 2012
Content
Immortal Images: Nuoda & Film Factory
Film Tails Out
IABM Report Revieals New Insights
Masstech Emerald 7.5 LE Preserves Vital Assets
Sneak Peek
Robotics in the Newsroom
Sislive America's World Cup
Expo World Travel Comments on Services
Transcoding: Getting There Faster
In Broadcast - December 2011/January 2012 - In Broadcast - December 2011/January 2012
In Broadcast - December 2011/January 2012 - 2
In Broadcast - December 2011/January 2012 - Content
In Broadcast - December 2011/January 2012 - Immortal Images: Nuoda & Film Factory
In Broadcast - December 2011/January 2012 - 5
In Broadcast - December 2011/January 2012 - 6
In Broadcast - December 2011/January 2012 - 7
In Broadcast - December 2011/January 2012 - 8
In Broadcast - December 2011/January 2012 - 9
In Broadcast - December 2011/January 2012 - 10
In Broadcast - December 2011/January 2012 - 11
In Broadcast - December 2011/January 2012 - 12
In Broadcast - December 2011/January 2012 - 13
In Broadcast - December 2011/January 2012 - 14
In Broadcast - December 2011/January 2012 - 15
In Broadcast - December 2011/January 2012 - 16
In Broadcast - December 2011/January 2012 - 17
In Broadcast - December 2011/January 2012 - 18
In Broadcast - December 2011/January 2012 - 19
In Broadcast - December 2011/January 2012 - Film Tails Out
In Broadcast - December 2011/January 2012 - IABM Report Revieals New Insights
In Broadcast - December 2011/January 2012 - 22
In Broadcast - December 2011/January 2012 - 23
In Broadcast - December 2011/January 2012 - 24
In Broadcast - December 2011/January 2012 - 25
In Broadcast - December 2011/January 2012 - 26
In Broadcast - December 2011/January 2012 - Masstech Emerald 7.5 LE Preserves Vital Assets
In Broadcast - December 2011/January 2012 - Sneak Peek
In Broadcast - December 2011/January 2012 - 29
In Broadcast - December 2011/January 2012 - 30
In Broadcast - December 2011/January 2012 - 31
In Broadcast - December 2011/January 2012 - 32
In Broadcast - December 2011/January 2012 - 33
In Broadcast - December 2011/January 2012 - 34
In Broadcast - December 2011/January 2012 - 35
In Broadcast - December 2011/January 2012 - 36
In Broadcast - December 2011/January 2012 - 37
In Broadcast - December 2011/January 2012 - 38
In Broadcast - December 2011/January 2012 - 39
In Broadcast - December 2011/January 2012 - 40
In Broadcast - December 2011/January 2012 - 41
In Broadcast - December 2011/January 2012 - 42
In Broadcast - December 2011/January 2012 - 43
In Broadcast - December 2011/January 2012 - 44
In Broadcast - December 2011/January 2012 - 45
In Broadcast - December 2011/January 2012 - 46
In Broadcast - December 2011/January 2012 - 47
In Broadcast - December 2011/January 2012 - 48
In Broadcast - December 2011/January 2012 - 49
In Broadcast - December 2011/January 2012 - 50
In Broadcast - December 2011/January 2012 - 51
In Broadcast - December 2011/January 2012 - 52
In Broadcast - December 2011/January 2012 - 53
In Broadcast - December 2011/January 2012 - 54
In Broadcast - December 2011/January 2012 - Robotics in the Newsroom
In Broadcast - December 2011/January 2012 - 56
In Broadcast - December 2011/January 2012 - 57
In Broadcast - December 2011/January 2012 - 58
In Broadcast - December 2011/January 2012 - 59
In Broadcast - December 2011/January 2012 - 60
In Broadcast - December 2011/January 2012 - 61
In Broadcast - December 2011/January 2012 - 62
In Broadcast - December 2011/January 2012 - 63
In Broadcast - December 2011/January 2012 - 64
In Broadcast - December 2011/January 2012 - 65
In Broadcast - December 2011/January 2012 - 66
In Broadcast - December 2011/January 2012 - 67
In Broadcast - December 2011/January 2012 - Sislive America's World Cup
In Broadcast - December 2011/January 2012 - 69
In Broadcast - December 2011/January 2012 - 70
In Broadcast - December 2011/January 2012 - 71
In Broadcast - December 2011/January 2012 - 72
In Broadcast - December 2011/January 2012 - 73
In Broadcast - December 2011/January 2012 - Expo World Travel Comments on Services
In Broadcast - December 2011/January 2012 - 75
In Broadcast - December 2011/January 2012 - 76
In Broadcast - December 2011/January 2012 - 77
In Broadcast - December 2011/January 2012 - 78
In Broadcast - December 2011/January 2012 - 79
In Broadcast - December 2011/January 2012 - 80
In Broadcast - December 2011/January 2012 - 81
In Broadcast - December 2011/January 2012 - 82
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In Broadcast - December 2011/January 2012 - 85
In Broadcast - December 2011/January 2012 - 86
In Broadcast - December 2011/January 2012 - 87
In Broadcast - December 2011/January 2012 - 88
In Broadcast - December 2011/January 2012 - 89
In Broadcast - December 2011/January 2012 - 90
In Broadcast - December 2011/January 2012 - 91
In Broadcast - December 2011/January 2012 - Transcoding: Getting There Faster
In Broadcast - December 2011/January 2012 - 93
In Broadcast - December 2011/January 2012 - 94
In Broadcast - December 2011/January 2012 - 95
In Broadcast - December 2011/January 2012 - 96
In Broadcast - December 2011/January 2012 - 97
In Broadcast - December 2011/January 2012 - 98
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