* 在以下形式的字符串中捕获字幕: * Language Name Formats <= 返回0, 继续 * gu vtt, ttml, srv3, srv2, srv1 * zh-Hans vtt, ttml, srv3, srv2, srv1 * en English vtt, ttml, srv3, srv2, srv1, json3 * 其它形式一律视为终结符, 返回-1, 终结 * @param {String} line
(line)
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