Post Production Flashcards
Frame rate for NTSC colour video
29.97 fps
USA colour video rate
59.94 fields per second
CRT meaning
Cathode Ray Tube
PAL video frame rate
25 fps
Film’s width to height ratio is called
Aspect Ratio
4:3 is also known as
1.33:1
What does ‘i’ stand for in 480i?
Interlaced or Interleaved
What does ‘p’ stand for in 480p?
Progressive
‘High Definition’ is used to describe video quality ____ and higher
1280x720
Wordclocks clock sample rate. What do black burst and tri-level sync clock?
Frame rates
Black burst & tri-level sync
Video references because they are well-clocked analogue video signals
Luminance
Varying brightness of the screen of the CRT and is determined by amount of voltage sent to the electron gun
Vertical retrace
0V dropout rate signals that are the clocking pulses for video that happen at 29.97 fps or 59.94 fields per second
How is tri-level sync more accurate than black burst?
It adds one voltage level to the black + retrace equation
Sync word
Identical information message that lets the synchroniser know ‘you have reached the end of the frame, start reading the next,’ similar to a period at the end of a sentence
Synchroniser
A device that reads the timecode playing from two or more tape machines, compares the codes, and adjusts the machines’ tape positions and speeds to match them
Cables affect on clocking
No matter how good your clock source, the cable used can greatly affect its timing
Cable normally used for clocking
75Ω coaxial cable
T-connectors are used for
Parallel distribution; connecting devices to function like a parallel circuit
Serial clock distribution
Uses the ‘thru’ port and connects devices in series
Signal degradation
As signal is passed from one device to another, quality can degrade further down the chain
Clock Skew
In some cases, signal may not split directly from the input to the output, and may first go thru additional circuitry - and this can cause small delay to the output signal. As this happens from device to device, the clock edge may become progressively misaligned, potentially introducing clocking errors
Audio arriving ____ ms early is within noticeable threshold of ‘subconscious disturbance’
20 - 40 ms
Subconscious disturbance
The point at which the audience notices audio out of sync
Tri-level sync is a _______ reference
Pace
Blackburst is a ______ reference
Speed
Timecode is a _______ reference
Position
Wordclock is used to control ______
Audio sample rate
What must be used on the last device in the chain when configuring a serial or parallel clock distribution?
A terminator
Dialogue (DX)
Recordings of voices. Humans, robots, cats, anything with a voice is dialogue, including breathing, laughing, coughing, and other sounds related to the mouth
Music (MX)
Used to guide the viewer’s experience throughout the film. In some cases, music is chosen and licensed, while in others, original music is written and performed in sync with picture
Sound Effects (SFX)
Almost everything that isn’t dialogue or music is likely to be considered a sound effect: explosions, laser blasts, background sounds like wind through a field, urban streets in a city. These sounds are either purchased and licensed or captured during field recording or sound design.
Foley
AKA. Sync Effect Acting: the process of performing sound effects in sync with, and while watching the picture, and recording them to be used in the soundtrack. Footsteps, clothing rustles, typing, and other sounds with specific timing and velocity
The biggest difference between SFX and Foley
Foley is performed and recorded in sync with picture, while SFX are gathered/created and edited after the fact
2-Pop
A 1kHz tone, one frame in duration which occurs in the audio track, coinciding with visual cue in the picture.
What is 2-Pop used for?
It is used to create a sync point between the sound mix delivered as audio-only, and the picture itself.
When does 2-Pop typically occur?
It usually occurs two seconds prior to picture start, thus the name 2-Pop
Flash frame
The visual sync point that 2-Pop aligns with, which is one frame of white screen followed by two full seconds of black screen
3:2 Pull Down
When converting 24 fps to interlaced 29.97 fps, each odd frame of film is copied to two video fields, while each even frame is copied to three video fields. This produces 60 fields of video (30 frames) from 24 film frames
AAF
Advanced Authoring Format
What is AAF
Originally designed to be an alternative to OMF, it is a universal file format used to transfer projects between different DAWs and NLEs
What does AAF store?
File track names, clip definitions and references to media files, volume, panning automation, and clip gain.
ADR
Alternative Dialogue Recording
or
Automated Dialogue Replacement
What is ADR?
The process of recording dialogue while lip-syncing with previously recorded video. It is used to replace problematic (noisy, roomy, distorted, etc.) production sound recordings, or to introduce new dialogue that didn’t exist during the original shoot
ADR Stage
Studio designed specifically for recording ADR and are acoustically treated to be very dead and free of reverberations or resonances
Aspect Ratio
Width-to-height ratio of an image, motion picture, or screen
What does aspect ratio affect when scaling up or down?
Program material can be scaled to different resolutions without stretching or distorting the image
Ex. 1920x1080 res can scale perfectly down to 1280x720
B-Roll
A term used to describe alternate footage, shot to intercut with the primary shots used in a program
How is B-Roll often shot?
MOS - shooting picture without audio
Backgrounds
AKA. ambience
Sound effects which recreate the background noise of the space seen on screen. Usually several different layers fill the surrounds and screen channels.
Room Tone
Recording ambient noise in a shooting location, used to fill in gaps in the dialogue track. Room tone is often mono, and is capture with the same boom mic used to record dialogue
Black Burst
AKA. House sync, video sync, video reference
Synchronisation pulse that matches the refresh rates (frame rates) of different video devices and platforms
Blimp
AKA. Zeppelin
A large pill-shaped basket whose surfaces are a grill of light plastic, lined internally with foam. It provides diffusion for microphones
BNC
AKA. Bayonet Nut Connector
A professional connector for wide-bandwidth coax cable and is the standard connector type for SDI video, and is used for component and composite video in professional applications.
Standard connector type for cables carrying clocking signals such as wordclock, Black Burst, and tri-level sync
BNC
BWAV
AKA. Broadcast Wave File (BWF)
An extension of the WAV file format that includes additional metadata such as timecode, scene, shot and take number, and other useful production information
Cueing
Documenting the specific timecode start and end times when a dialogue line, Foley element, piece of music, or any specific clip of audio needs to be placed in the soundtrack. This is done using slugs
Slugs
Blank clips created and used in Pro Tools to cue when dialogue, Foley, music, or any specific clip of audio needs to be placed in the soundtrack
Cue Sheet
A document that identifies at what specific timecode start and end time that each sound will, or currently does happen. They are sometimes displayed as vertical columns, per track, with events arrayed chronologically from the top of the page to the bottom
Dailies
AKA. Rushes
Refers to the workflow when shooting film in which the reels are sent to the lab at the end of each shooting day, developed overnight, and returned to the set for review in the morning - daily
DCP (Digital Cinema Package)
A set of the final data-compressed files including picture, sound, subtitles and other metadata, packaged on a hard-drive for playback in a digital theatre
Digital equivalent of a ‘release print’
DCP
Release Print
The final copy of a film to be played in theatres
DCI (Digital Cinema Initiatives)
Sets guidelines to ensure compatibility with all digital cinemas
Dead Cat
AKA. Wind jammer, wind sock
An artificial fur covering that wraps around a blimp or foam microphone windscreen to add extra wind diffusion
Decca Tree
A T-shaped microphone bracket designed to suspend three widely-spaced omni-directional microphones over a large musical ensemble or orchestra. The mics are arrayed in an obtuse, isosceles triangle, with the two mics at the base typically being 2 meters apart, and the 3rd mic extending out 1 meter from the centre of the base
Deliverables
The final audio files that will be returned to the production company, studio or network. The recipient will usually dictate their required channel layout for multichannel mixes as well as requirements for alternate dubs, down-mixes, and stems
Diegetic Music
AKA. Source music
Music that seems to be audible within the environment pictured on screen. In other words, it is part of the characters’ experience, not just part of the viewers’ experience.
Drop Frame Timecode
A type of timecode that selectively skips over specific frame numbers (not the frames themselves)
Dub Stage
A control room for mixing films and tv programs which is built to mimic the condition of an actual movie theatre
Dub
A mix of a film soundtrack
EDL (Edit Decision List)
A document that is generate by an NLE which contains documentation regarding every clip in a particular sequence’s timeline. It usually includes the timecode start and end time of each clip’s current timeline position
Edit Bays
Small office-sized rooms designed to house non-linear editing systems for video and audio. Acoustically treated and have high quality monitoring; typically tied to the facility’s data network so files can be quickly sent to any of the stages
Foley Stage
Studio designed specifically for recording Foley. Typically large rooms that look like a warehouse full of props. Part of the floor will house “Foley pits” which are compartments containing different surfaces, such as sand, gravel, cement, grass, wood, tile, etc.
Frame
A single image in a motion picture sequence. On film, it is literally a single image on the reel. In progressive scan video, it is a single capture or rendered image. In interlaced video, it is one complete scanning cycle containing both fields
Frame Rate
In video: the number of frames that are captured or played within one second
In timecode: the number of frame numbers that a whole real-time second is divided into
Futz
Processing audio to make it sound like it is playing out of a device or object, such as a cell phone, walkie talkie, boom box, etc.
Gaffer
The head of the electrical department on a film set
Grip
A skilled person who is part of the team that provides, sets up, adjusts and tears down the majority of the tech equipment on a film set. Deals with lighting, camera mounting, rigging, etc.
Group Walla
AKA. walla
Audio that is used to recreate background conversation of a group of people
Hard Sound Effect
A sound effect that is edited to synchronies with a specific event that in seen on screen