• Matthew Heaney's avatar
    WebM muxer writes WebVTT subtitle track · 509642b4
    Matthew Heaney authored
    The Matroska muxer now allows WebVTT subtitle tracks to be written
    while in WebM muxing mode.
    
    WebVTT subtitle tracks have four kinds: "subtitles", "captions",
    "descriptions", and "metadata". Each text track kind has a distinct
    Mastroska CodecID and track type, as described in the temporal
    metadata guidelines here:
    
    http://wiki.webmproject.org/webm-metadata/temporal-metadata/webvtt-in-webm
    
    When the stream has codec id AV_CODEC_ID_WEBVTT, the stream packet is
    serialized per the temporal metadata guidelines cited above. The
    WebVTT cue is written as a Matroska block group. The block frame
    comprises the WebVTT cue id, followed by the cue settings, followed by
    the cue text.  (The block timestamp is synthesized from the cue
    timestamp.)
    Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
    509642b4
matroskaenc.c 59.8 KB