HDV and Jitter


    Jul 26 2006 | 7:52 pm
    What is the current status of inputting HDV (1080i) into Jitter? We
    are considering the use of HDV for a video installation, with minimal
    Jitter processing, outputing the signal at 16:9 to a 1024 X 768 data
    projector using a dual 2 Gig Mac.
    Thanks,
    Randall Packer

    • Jul 26 2006 | 8:27 pm
      On Jul 26, 2006, at 12:52 PM, Randall Packer wrote:
      > What is the current status of inputting HDV (1080i) into Jitter? We
      > are considering the use of HDV for a video installation, with
      > minimal Jitter processing, outputing the signal at 16:9 to a 1024 X
      > 768 data projector using a dual 2 Gig Mac.
      Unfortunately, there is no QT input component for HDV. iMovie and FCP
      make use of a private API to interface with these cameras. We may
      investigate HDV input at some point in the future, but certainly
      won't have it available anytime soon, unless some other software
      developer makes an HDV QT input component. Also note that there will
      possibly be greater latency with HDV which uses interframe (temporal)
      compression, unlike DV or DVCPro HD.
      I have had success using the QT input component for DVCPro HD
      (provided with FCP) with the Panasonic AG-HVX200. However, note that
      over firewire any 720 DVCProHD signal is delivered on top of a 1080
      DVCProHD signal. Since Jitter doesn't have special DVCPro HD code to
      unpack this data, it looks like digital barf if streaming at 720
      DVCProHD into Jitter. I am able to stream and draw to a window the
      1080 DVCPro HD signal, however, in Jitter even on a 1.67GHz G4
      AluBook. These cameras are obviously more expensive than the HDV
      cameras out there, but they provide better quality images, with
      higher quality chroma sampling (4:2:2 instead of 4:2:0), less
      intraframe (spatial) compression, and no interframe (temporal)
      compression.
      Also of note, if I do capture DVCPro HD data for playback (I use FCP
      to grab the 720p data), I typically convert to high quality photo
      jpeg for significantly faster playback performance (30fps for photo
      jpeg vs 8 fps in a slab based patch I use on my 1.67 G4 AluBook), and
      compatibility on machines without FCP installed. If you are trying to
      playback DVCPro HD in jit.qt.movie, make sure you either have the
      highquality attribute enabled or have set it in the media file
      itself, just as you would for DV. Otherwise it renders as preview
      quailty.
      I believe you might need to also export to Photo JPEG for HDV data
      just to play in Jitter, and even if it's not a requirement, you might
      get faster framerates if you do.
      For future reference, this is better suited for the Jitter list.
      -Joshua
    • Jul 26 2006 | 9:53 pm
      Moving this thread to Jitter, as per Joshua's suggestion...