I would like to record uncompressed HD through SDI. The data rate is 1.485 Gbps. I am thinking of four or five U320 SCSI drives in a Raid 0 or Raid 5 array. Would this be fast enough and are 15K drives needed or is 10K sufficient?
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does anyone know how much disk space is required to store 10 hours of HD cassette content? Also, if a production has say... 45 hours of HD material on cassette, are there current hardware system configurations which allow a post editor to have access to all 45 hours at one time? Is it a normal requirement, in a professional post production editing studio, to have full disk access to all 45 hours of a production i.e. all 45 hours already loaded to disk? I am trying to find out a bit about this for my son who is in college in Minnesota. thanks very much James Murphy answered: No quick answer here. First, if you are going to put it on disk, you have to consider your compression scheme. Uncompressed HD is going to chew up hard drive space at an alarming rate, low to high compression is a trade off in quality versus size. Is the HD content captured at 8 or 10 bit? Is it 1080i or p, 720p, what frame rate? These will all make a difference in terms of the amount of space used. You are likely talking about Terabytes of storage for 10 hours at high resolution HD, either way. The Avid DNXHD codecs have excellent compression quality at scalable quality/size. With 45 hours of HD, in a typical post environment, if there is such a thing, it is likely they are working in offline qualities and then taking the resulting finished piece and only recapturing the HD content that is needed to make a master. To put 45 hours of uncompressed HD on disk is going to be VERY expensive, you are talking about rooms filled with drives. The workflow would likely be something more along the lines of: -Capture at very low resolution the HD content -Edit the offline quality to a finished piece, so the 45 hours is edited to a 2 hour movie -Then the 2 hours needed to make the finished piece are recaptured at full resolution. 2 hours of HD storage is going to be easy compared to 45 hours. I hope this helps, James Murphy Avid AE |
Originally posted by PanamaMike Seems to me that the technology necessary for this functionality exists. For example , this chip could be used to encode the HDTV signal. All that's needed is someone that could design a board to add it to a PC and a software interface to something like SAGE TV. Mike |
Originally posted by PanamaMike Seems to me that the technology necessary for this functionality exists. For example , this chip could be used to encode the HDTV signal. All that's needed is someone that could design a board to add it to a PC and a software interface to something like SAGE TV. |
Originally posted by odyssey Kai, I am still looking at the i/o options. The ASI data stream will have to be demuxed and handled through an HD MPEG decoder…there are good options for doing this. I am still researching the options for HD SDI i/o. My display is DVI and HD-SDI only and can handle the SMPTE 292 formats. |
but there is currently a used one available for like $10.000 on one site |