ATS Helps Degeto To Break The Logjam
Stefan Raupp
Stefan Raupp, Senior Technologist at Degeto Film GmbH in Frankfurt am Main, had a series of workflow bottlenecks that needed addressing One of the biggest problems was getting our material into R128 compliance. In the past, we would use a J nger Audio C8000 modular system during ingest to process our content.
This is a realtime operation, and it performs audio manipulation in various ways. However, because it is realtime, it produces delays during processing. Every step has to be checked very carefully because you have both decoding delay and encoding delay. Depending on the workflow steps, you have to compensate the processing delays by delaying the video relative to the audio so that its in phase again.
For Degeto, varying video delay wasnt the only issue. A second problem was the realtime processing during the ingest process. You never know the exact audio data over the whole program duration, only in a time window (dictated by the realtime hardware). This makes for a complex problem to get accurate (EBU) R 128 (loudness measurement) data for the entire film.
Degeto Film is the Film Archive and Production Partner for the ARD (Arbeitsgemeinschaft der ffentlich-rechtlichen Rundfunkanstalten der Bundesrepublik Deutschland, a joint organization of Germanys regional public broadcasters). We have a lot of different films in our archives, from black and white old stuff to modern HD premium material. We are trying to deliver the best material and get the best postproduction results for the ARD. When we receive films, sometimes the audio and video has to be remastered. Also, multichannel (5.1) audio is part of our daily business.
Raupps workflow issues are compounded by legacy format limitations. When we are doing XDCAM HD, we have the problem that it only has eight audio tracks. This is not enough for our needs. We also have to deliver an Audio Description so that sight impaired people can also enjoy the film even though there may be no dialogue. Stereo, Audio Description and 5.1 together use ten tracks, which does not fit in the XDCAM HD format. So, the discrete 5.1tracks have to be transcoded into Dolby E. When we have to work with Dolby E in our Final Cut systems, it has to be decoded back into discrete tracks.
Our HD tape formats are Sonys HDCAM SR as the premium format and XDCAM HD422 for dailies. For tape ingest, we are using Omneon Components. The codec is MXF wrapped 100 Mbit AVC-Intra for our premium material and XDCAM HD422 for the dailies. The ingest is done with Omneon MediaCenter. From there, the files are transferred to the (Harmonic Omneon) MediaGrid, which is our central working storage. Connected to the MediaGrid are, among other things, three Final Cut systems, Amberfin iCR, (Minnetonka Audio) AudioTools Server (ATS), and Telestream Vantage. After finishing all processing on the files, they are transferred to our Spectra Logic (T680) tape library.
We build a directory structure for the ingested files depending on their audio content. As an example, a separate directory for:
files with audio on 1/2 only, which can be mono, stereo or surround
files with audio on 1/2 and 5/6, with 5/6 being the tracks for the audio description
files with audio on 1/2 and 7/8), with 7/8 carrying Dolby E encoded content
files with audio on 1/2, 5/6 and 7/8
files with discrete multichannel (split mono) audio tracks
A Copy routine transfers the files from the ingest directory to ATS, which has the same directory structure. The ATS server is multiprocessor hardware with a 2.5 TB RAID. Specifically, it is an HP ProLiant DL380 G5 with dual 3 GHz Xeon 5160s with 20 GB RAM and five 500 GB RAIDd SAS drives as local storage. The server is running Windows Server 2008R2. This system is fast enough for our work.
We are working 10 hours a day, so there are 14 hours of free time for the system. When we start in the morning, all jobs are done and have been copied back to their places, so there is no need for expensive hardware. Our tests indicated that copying the MXF files to the local storage of the ATS system, doing all audio jobs locally, then copying the corrected MXF files back to the CMS system is the fastest and best way for our environment. Doing the audio extraction and all jobs over the network and not on local drives results in heavy network traffic and makes no sense for us. Our network is mixed 1 and 10 Gigabit, depending on the various systems. Besides that, we can program time slots for the Copy processes while network traffic is low.
The RAID System can hold about 20 films. During processing, the RAID is filled about 60%, so utilization is perfectly balanced. After processing, the MXF and the log files are moved back to the Omneon MediaGrid, where they made known to the CMS system and written to our data tape library. Our CMS system is an arvato Systems VPMS.
The ingest station
With the help of Minnetonka Audios (professional services) staff, we created workflows for adding and embedding ADR (Audio Description) WAV files into existing MXF files. This is a big help for us, for completing films with ADR which were ingested in the past. For editing films in Apples Final Cut Pro, AudioTools Server does the Dolby E decoding and re encoding. All files are checked and corrected for (EBU) R 128 compliance. Dolby E source material and metadata are also corrected by ATS. The ATS log files are saved together with the MXF files in the CMS system, so we also have access to the (loudness) measurement file (for compliance verification).
Degeto Film worked with system integrator Netorium GmbH to realize both the original and new AudioTools configurations. Netorium installed the systems, and provided integration services to insure seamless interoperation with Degetos existi
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ATS Helps Degeto To Break The Logjam 
