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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: Michael Niedermayer <michaelni@gmx.at>
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory in git. You can also view it online at http://ffmpeg.org/documentation.html 2) Licensing ------------ * See the LICENSE file. 3) Build and Install -------------------- * See the INSTALL file.