Subtitles and Caption Subtitle File Formats and Standards 1 — Questions and Answers
Question 1: What does the file extension '.srt' stand for in subtitle files?
- Standard Rendering Text
- SubRip Text (Correct answer)
- Subtitle Reference Track
- Streaming Readable Text
Correct answer: SubRip Text
SRT stands for SubRip Text, a simple and widely supported subtitle file format that stores timecodes and plain text in a sequential numbered format.
Question 2: Which subtitle file format is the web standard used by HTML5 video and most online streaming platforms?
- SRT
- ASS
- WebVTT (.vtt) (Correct answer)
- TTML
Correct answer: WebVTT (.vtt)
WebVTT (Web Video Text Tracks) is the HTML5 standard subtitle format, natively supported by most modern browsers and streaming platforms.
Question 3: What subtitle format is commonly required by Netflix for professional content delivery?
- SRT only
- TTML/IMSC (Timed Text Markup Language) (Correct answer)
- Plain text (.txt)
- PDF captions
Correct answer: TTML/IMSC (Timed Text Markup Language)
Netflix requires TTML/IMSC (also called DFXP) for professional content delivery because it supports precise formatting, positioning, and styling metadata.
Question 4: What is the file format used for closed captions in US broadcast television (ATSC digital TV)?
- SRT
- WebVTT
- CEA-708 embedded in the video stream (Correct answer)
- SubStation Alpha (SSA)
Correct answer: CEA-708 embedded in the video stream
CEA-708 caption data is embedded directly within the video stream's user data area for US digital broadcast television, not stored as a separate file.
Question 5: What is the SMPTE-TT format used for in subtitle standards?
- A format for printing subtitle scripts on paper
- A timed text format for professional broadcast and cinema applications (Correct answer)
- A compressed video format for subtitle storage
- An audio format for audio description tracks
Correct answer: A timed text format for professional broadcast and cinema applications
SMPTE-TT (Society of Motion Picture and Television Engineers Timed Text) is an XML-based format for professional broadcast, cinema, and archive subtitle delivery.
Question 6: What is the primary limitation of the SRT format compared to WebVTT?
- SRT files are larger than WebVTT files
- SRT does not natively support styling, positioning, or speaker identification metadata (Correct answer)
- SRT cannot store timecodes in milliseconds
- SRT only works on Windows systems
Correct answer: SRT does not natively support styling, positioning, or speaker identification metadata
SRT is a plain text format that stores only timecodes and text without native support for styling (fonts, colors) or precise positioning, unlike WebVTT which supports CSS styling and cue positioning.
Subtitles and Caption Subtitle File Formats and Standards 1
What does the file extension '.srt' stand for in subtitle files?