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H.A.C.K. Audio/Video Operator Crew Image


  • Canon camcorder
    • NTSC SD (720x480 interlaced 29.97 FPS)
    • records to miniDV tapes (60 minutes in SP, 90 minutes in LP mode)
    • IEEE-1394/FireWire connection to PC
    • battery broken, but works with power supply
    • 12/16-bit PCM audio recording
      • built-in stereo microphone (records quite a lot of noise)
      • allows for external audio input via stereo 3.5 mm TRS
  • Mono lavalier microphone
    • requires 1xAA battery
    • has 5 meters of cable with a 3.5 mm TS plug
  • 3 microphones with balanced output
  • various cables (XLR, RCA, 6.3 mm TS, 3.5 mm TRS)
  • Velbon tripod
  • Alto S-8 mixing console
    • 8 input channels
      • 5 balanced mono + 1 unbalanced stereo or
      • 4 balanced mono + 2 unbalanced stereo
    • 2 main output channels + tape output + monitor/headphone
  • PC with IEEE-1394/FireWire and Debian with dvgrab installed
  • Big speaker box (TODO verify status)
  • Power amplifier (TODO verify status)




Improving video recording

  • experiment with snowmix(external link)
  • capture speaker's screen with VNC (also leads to simple and wireless beamer setup)
  • set up a loot TV to monitor camera output

Rewiring bastya12 audio infrastructure

Current setup:
  • stereo unbalanced audio cable on the floor from plenum table to amplifier
  • stereo unbalanced audio cable on the ceiling from amplifier to kiosk for LED display visualization
Proposed setup: centralized audio switchboard
  • inputs:
    • Raspberry Pi
    • plenum table
    • microphones (balanced, both for speaker and audience)
  • outputs:
    • to amplifier
    • to visualization
    • to video camera for recording (in case of talks and workshops)


Recording a simple talk with slides merged later (e.g. Cryptonite)

The HOWTO below assumes that an empty cassette has been put into the camcorder and is positioned at the beginning of the tape.
  1. set up the tripod near the table, facing the speaker
    • unlock, expand and lock the telescopic legs (two black plastic locks near the bottom of each leg)
    • use the screws to release and tighten before panning, tilting or rolling
  2. set up the camcorder on the tripod
    • unpack the camcorder and its power supply from the black bag
    • the camcorder doesn't have a battery, connect the power supply in a way that people don't pull it by accident
    • unlock the camera mount from the tripod with the lock on the right
    • screw the camera on the mount
    • lock the camera mount on the tripod with the lock on the right
    • open the small screen on the left (it has some dead pixels, and some color channels might have problems)
    • turn on the camcorder with the round switch on the right by pressing the small plastic lock and rotating it into REC position
    • the camera turns off after a few minutes of inactivity (beeps before doing so), if this happens, just turn it off and on again; this happens to protect the tape and the head, don't leave the camera on without recording unnecessarily
    • the big round button in the center of the on-off switch toggles between record and pause
  3. change default camera settings
    • the menu can be opened by pressing the menu button
    • for navigation, a small three-way button can be found in the front left (can be pushed up and down to move the cursor, pressing it selects the active item)
    • change the audio quality from the default 12 bits to 16 bits
    • change the video recording mode from SP (60 min) to LP (90 min)
    • change the video output to headphone output
    • if you intend to use the zoom, you can disable digital zoom as well
    • now you can connect an earphone into the appropriate socket to monitor audio
    • the settings are persistent as long as the camera has power (even when it's turned off but connected to the power supply)
  4. set up the lavalier microphone on the shirt of the speaker
    • get its box from the B5 storage box
    • lay the 5 meters of the cable in the direction of the tripod, avoiding people walking around it
    • connect it to the (red) microphone socket of the camera
    • test it by turning the preamplifier (the small box near the microphone) on and monitoring the earphones while the camcorder is turned on and in record mode, then turn it off
    • turn on the preamplifier only right before the talk starts to conserve battery
  5. Imagerecord the event
    • use the headphone to monitor audio
    • if there are persistent problems with the audio output because of the microphone, you can always pull the plug from the camera, and it switches to the built-in stereo microphone within a second
    • if you want the slides to be merged, avoid panning, record the image with the speaker in the center and at least a small section of the slides visible on the top left corner (see example on the right, and attached input and output samples)
    • the T-W slider can be used to zoom in and out
  6. remove the microphone
    • turn off the preamplifier right after the talk ended to conserve battery
    • put the microphone with the preamplifier and the cable into its box
    • put the box into the B5 storage box
  7. remove the camcorder from the tripod
    • unlock the camera mount from the tripod with the lock on the right
    • unscrew the camcorder
    • lock the camera mount on the tripod with the lock on the right
    • put the camera and the power supply into the black bag
  8. pack up the tripod
    • unlock, retract then relock the telescopic legs
    • put the tripod and the black camera bag back to its original place

Contributors to this page: dnet5208 points  .
Page last modified on Wednesday 16 of March, 2016 10:28:18 CET by dnet5208 points .

Upcoming events

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