View Source vtc-ex

A SMPTE Timecode Library for Elixir

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PyPI version Documentation

demo

Demo

A small preview of what Vtc has to offer:

iex> Timecode.with_seconds!(1.5, Rates.f23_98())
"<00:05:23:04 <23.98 NTSC>>"

iex> tc = Timecode.with_frames!("17:23:13:02", Rates.f23_98())
"<17:23:00:02 <23.98 NTSC>>"

iex> Timecode.frames(tc)
1501922

iex> Timecode.feet_and_frames(tc)
"<93889+10 :ff35mm_4perf>"

iex> Timecode.compare(tc, "02:00:00:00")
:gt

iex> tc = Timecode.add(tc, "01:00:00:00")
"<18:23:13:02 <23.98 NTSC>>"

iex> Timecode.eval at: 23.98 do
iex>   tc + "00:30:00:00" * 2 - "00:15:00:00"
iex> end
"<19:08:13:02 <23.98 NTSC>>"

iex> a_in = Timecode.with_frames!("01:00:00:00", Rates.f23_98())
iex> a = Range.new!(a_in, "02:00:00:00")
"<01:00:00:00 - 02:00:00:00 :exclusive <23.98 NTSC>>"
iex>
iex> b_in = Timecode.with_frames!("01:45:00:00", Rates.f23_98())
iex> b = Range.new!(b_in, "02:30:00:00")
"<01:45:00:00 - 02:30:00:00 :exclusive <23.98 NTSC>>"
iex>
iex> Range.intersection!(a, b)
"<01:45:00:00 - 02:00:00:00 :exclusive <23.98 NTSC>>"

Note that printing statements like inspect/1 have been elided from the examples above. For a more in depth look at the full capabilities of this library, check out the quickstart guide or API reference.

goals

Goals

  • Offer a comprehensive set of tools for parsing, manipulating and rendering timecode in with all it's quirks and incarnations.

  • Define an intuitive, idiomatic Elixir API.

  • Do all calculations in Rational representation, so there is both no drift or rounding errors when manipulating NTSC timecode, and we can represent time as finely as possible rather than being limited to the granularity of frame numbers.

  • Be approachable for newcomers to the timecode problem space. Each function and concept in the API reference includes a primer on what it is and where it is used in Film and Television workflow.

  • Offer a flexible set of tools that support both rigorous, production-quality code and quick scratch scripts.

features

Features

  • SMPTE Conventions:
    • [X] NTSC
    • [X] Drop-Frame
    • [ ] Interlaced timecode
  • Timecode Representations:
    • [X] Timecode | '01:00:00:00'

    • [X] Frames | 86400

    • [X] Seconds | 3600.0

    • [X] Runtime | '01:00:00.0'

    • [X] Rational | 18018/5

    • [X] Feet+Frames | '5400+00'

      • [X] 35mm, 4-perf
      • [ ] 35mm, 3-perf
      • [X] 35mm, 2-perf
      • [X] 16mm
    • [X] Premiere Ticks | 15240960000000

  • Operations:
    • [X] Comparisons (==, <, <=, >, >=)
    • [X] Add
    • [X] Subtract
    • [X] Scale (multiply and divide)
    • [X] Divmod
    • [X] Modulo
    • [X] Negative
    • [X] Absolute
    • [X] Rebase (recalculate frame count at new framerate)
    • [X] Native Operator Evaluation
  • Flexible Parsing:
    • [X] Partial timecodes | '1:12'

    • [X] Partial runtimes | '1.5'

    • [X] Negative string values | '-1:12', '-3+00'

    • [X] Poorly formatted tc | '1:13:4'

  • [X] Built-in consts for common framerates.
  • [X] Configurable rounding options.
  • [X] Support for standard library sorting behavior.
  • [X] Range type for working with and comparing frame ranges.
    • [X] Overlap between ranges
    • [X] Distance between ranges
    • [X] Inclusive and exclusive ranges

attributions

Attributions

Drop-frame calculations adapted from David Heidelberger's blog.
35mm, 2perf and 16mm format support based on Jamie Hardt's work for vtc-rs.
Logo made by Freepik from www.flaticon.com

installation

Installation

If available in Hex, the package can be installed by adding vtc to your list of dependencies in mix.exs:

def deps do
  [
    {:vtc, "~> 0.7"}
  ]
end