Subtitle format notes

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The physical and human spects dealing with audio, video, and images

Vision and color perception: objectively describing color · the eyes and the brain · physics, numbers, and (non)linearity · color spaces · references, links, and unsorted stuff

Image: file formats · noise reduction · halftoning, dithering · illuminant correction · Image descriptors · Reverse image search · image feature and contour detection · OCR · Image - unsorted

Video: file format notes · video encoding notes · On display speed · Screen tearing and vsync

Simpler display types · Video display notes · Display DIY
Subtitle format notes


Audio physics and physiology: Sound physics and some human psychoacoustics · Descriptions used for sound and music

Noise stuff: Stray signals and noise · sound-related noise names · electronic non-coupled noise names · electronic coupled noise · ground loop · strategies to avoid coupled noise · Sampling, reproduction, and transmission distortions · (tape) noise reduction


Digital sound and processing: capture, storage, reproduction · on APIs (and latency) · programming and codecs · some glossary · Audio and signal processing - unsorted stuff

Music electronics: device voltage and impedance, audio and otherwise · amps and speakers · basic audio hacks · Simple ADCs and DACs · digital audio · multichannel and surround
On the stage side: microphones · studio and stage notes · Effects · sync


Electronic music:

Electronic music - musical terms
MIDI · Some history, ways of making noises · Gaming synth · microcontroller synth
Modular synth (eurorack, mostly):
sync · power supply · formats (physical, interconnects)
DAW: Ableton notes · MuLab notes · Mainstage notes


Unsorted: Visuals DIY · Signal analysis, modeling, processing (some audio, some more generic) · Music fingerprinting and identification

For more, see Category:Audio, video, images

Formats

Formats include:

  • Plain-text:
    • Various, but most importantly:
    • SRT (SubRip [1] [2]) - very simple (but not too well standardized, and some advanced features are not well handled by some players/editors)
  • Subtitle editors' internal formats (text, binary, xml, other), some of which became more widely used:
    • SSA (SubStation Alpha, software of the same name) [3] [4]
    • ASS (Advanced Substation Alpha, aegisub) - an extension of SSA
    • AS5 (ASS version 5) [5] [6]
    • AQTitle(verify) [7]
    • JacoSub [8]
    • XombieSub (old?)
    • Turbotitler (old)
  • Image-based: (avoids font problems, larger)
    • VOBsub (.sub and .idx) are subtitle streams as used by DVD (verify)
    • MicroDVD (.sub), specific to the MicroDVD player [9]
    • PRS (Pre-rendered subtitles) stores (PNG) images [10]
  • XML-based
    • USF (Universal Subtitle Format) [11] [12], and XML format that is not very common outside of Matroska containers
    • SSF (Structured Subtitles Format) is a newer XML-based format (apparently with no current major interest or support [13])
  • Other/unsorted (and other internal formats):
    • VTT, a.k.a. WebVTT[14][15]
    • SAMI (.smi) [16], often used in Korea
    • DVD-based/derived (CC, SPU, VobSub)
    • Karaoke formats (.lrc, .vkt, )
    • MPSub (.sub), a format internal to mplayer [17]
    • MPEG-4 Timed Text [18]
    • Power DivX (.psb) [19]
    • ViPlay Subtitle File (.vsf)
    • Phoenix Japanimation Society (.pjs) [20] (old(verify))
    • Subsonic (.sub) [21]
    • ZeroG (.zeg) [22]
    • Adove Encore (.txt) [23]
    • MPL2 [24]
    • VPlayer [25]
    • Sasami Script (.s2k)
    • SubViewer (verify)
    • RT (verify)
    • DVB (verify)
    • Teletext (verify)
    • LRC[26] (Lyrics, meant for lyrics/karaoke on audio)
    • TTML [27]
    • ARIB (Association of Radio Industries and Businesses)


Software

Editors and other utilities: