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Use when modifying the WebVTT parser, debugging timestamp truncation, matching Python webvtt library behavior, or working with subtitle files.
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| name | vtt-parsing |
| description | Use when modifying the WebVTT parser, debugging timestamp truncation, matching Python webvtt library behavior, or working with subtitle files. |
The VTT parser converts WebVTT subtitle files into plain text with second-granularity timestamps. It matches the Python webvtt library behavior byte-for-byte.
s02_parse_vtt_file.py)# Python original:
old_text = ["__bla__"]
old_time = "00:00:00"
out = [dict(text="")]
for c in webvtt.read(filename):
if out[-1]["text"] != old_text[-1]:
out.append(dict(text=old_text[-1], time=old_time))
old_text = c.text.split("\n")
old_time = c.start
# Skip first two entries, format as "HH:MM:SS text\n"
c.text.split("\n")[-1])Auto-generated YouTube captions contain inline VTT tags like <00:00:01.350>, <c>, </c>. These are stripped before processing:
fn strip_vtt_tags(text: &str) -> String {
// Remove anything between < and >
}
vtt crate)Although the vtt crate is in Cargo.toml, a custom parser is used because the vtt crate handles whitespace-only lines differently from Python's webvtt library. The custom parser:
-->)Each line: HH:MM:SS caption_text\n
No milliseconds, no VTT tags, no consecutive duplicate lines.
The test fixture tests/fixtures/cW3tzRzTHKI.en.vtt produces a known 37-line output that matches the Python implementation byte-for-byte.
src/utils/vtt_parser.rs — Parser implementationtests/fixtures/cW3tzRzTHKI.en.vtt — Test fixturesource04/tsum/s02_parse_vtt_file.py — Python originalsource04/tsum/t02_parse_vtt_file.py — Python ground truth test