avformat/matroskadec: add WebVTT support

WebM files now support inband text tracks, as described in the
following specification:

http://wiki.webmproject.org/webm-metadata/temporal-metadata/webvtt-in-webm

The Matroska demuxer now detects the presence of WebVTT tracks,
synthesizing WebVTT packets (having codec id AV_CODEC_ID_WEBVTT) and
pushing them downstream in the normal way.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 1 insertions, 1 deletions

diff --git a/libavformat/matroska.h b/libavformat/matroska.h
index 9c8071adaf..7cf423c502 100644
--- a/libavformat/matroska.h
+++ b/libavformat/matroska.h
@@ -265,7 +265,7 @@ typedef enum {
  */
 
 typedef struct CodecTags{
-    char str[20];
+    char str[22];
     enum AVCodecID id;
 }CodecTags;