Eyevinn / hls-m3u8 / 28228945126

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main: 92%

Pull #86

github

fix: omit repeated zero byte range offsets

EXT-X-BYTERANGE without an @o offset is not equivalent to @0.
When the offset is omitted, HLS clients continue from the byte after
the previous range. Writing @0 for every zero-valued Offset turns
parsed continuation ranges into absolute ranges at the start of the
resource, changing playlist semantics on encode.

Keep an explicit @0 only for the first emitted media segment so the
playlist has an anchor when there is no previous visible range.
Subsequent zero offsets are written without @0 to preserve
continuation behavior, while non-zero offsets remain explicit.
Attribute byte ranges still include zero offsets because they are
self-contained attributes rather than segment continuation markers.

See the EXT-X-BYTERANGE docs for more details on the offset parameter:
https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis#section-4.4.4.2

Also take note that EXT-X-MAP requires the offset to be present:
https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis#section-4.4.4.5

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