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March 2008 Digital Rapids StreamZ Provides Efficient, High-Quality Encoding Workflow for TVN EntertainmentThe Digital Rapids systems were initially selected to solve challenges we faced in our early workflows for encoding VOD files in the SMPTE VC-1 format. As a way to support the requirements of a major TVN customer, we began with primitive, command line tools to control Microsoft Windows Media Encoder in order to produce broadcast-quality VC-1 VOD files. Second to good quality, though, achieving a real-time or better workflow is an important consideration for us, considering the large amount of hours of content we produce and distribute (as mentioned above, over 3000 hours per month in multiple formats). Given our environment, we knew that a manual process using the command line interface (CLI) was not the ultimate solution, so we created a list of requirements and interviewed a number of companies. We found that the Digital Rapids system was only solution that met the majority of our needs, including the ability to start and stop based on Linear Time Code (LTC) so that we could piggyback our VC-1 encoding onto our MPEG-2 encoding. The StreamZ family delivers a good-quality encoded product with good built-in workflow, and integrated Dolby Digital (AC-3) encoding support. We worked for a while with Digital Rapids and their technology partners to refine the system to our needs, then put it into production – where it has worked flawlessly ever since (about two years).
Since the original installation, the systems have been enhanced features such as Watch Folder based transcoding. TVN was also a beta test site for Digital Rapids' now-released Studio AVC Encoder module, which provides advanced H.264 encoding for VOD and IPTV. Optimized for the stringent specifications of IPTV delivery by leading telecommunications providers, the Studio AVC Encoder enables the encoding of VOD assets complete with Closed Captioning. The local support that we received with the systems has also been an asset as our needs evolve.
Our input sources to the Digital Rapids systems can be file-based or tape-based. The systems are connected to our Digital Betacam, HDCAM and D5 tape decks through SDI or HD-SDI with embedded audio. We take advantage of the Digital Rapids StreamEnterprise software’s ability to start and stop encoding based on Linear Time Code to synchronize with other existing equipment. Our existing MPEG-2 encoders control the decks, while the Digital Rapids systems monitor the decks’ time code output and start encoding at the designated “Mark-In” point. This allows us to roll a tape once, and get two encodes (for example, MPEG-2 and H.264) in real time.
We are also realizing business benefits from the multi-format capabilities of the system. As we venture into areas of new business, we are presented with requirements that are not typical in the broadcast industry – such as transcoding a QuickTime .mov file to a CableLabs-compliant MPEG-2 file. It seems that no matter what the input format is, the Digital Rapids systems will read it and allow us to produce any output format of our choice. This flexibility allows us to accommodate the changing requirements of our content providers. Transcoding steps are kept to a minimum, saving us time and money.
As TVN’s need to encode and transcode more and more hours of content for the H.264 IPTV community grows, I expect that so will our need to operate more and more Digital Rapids systems, possibly growing into a centrally managed transcoding “farm” environment as offered by Digital Rapids Transcode Manager. The Digital Rapids systems have delivered the workflow efficiencies and high-quality output that we were looking for in a solution, with the flexibility to grow with us.
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