mkv subtitle container(S_TEXT/UTF8) not work

mkv video file with subtitle container(S_TEXT/UTF8) vlc player not show.

need support for(ffmpeg/libavcodec/avcodec.h)

AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p')

errors in console:

[0x7f7438da9a98] main decoder debug: looking for decoder module matching "any": 37 candidates [0x7f7438da9a98] main decoder debug: no decoder modules matched [0x7f7438da9a98] main decoder error: no suitable decoder module for fourcc undf'. VLC probably does not support this sound or video format. [0x7f7438da9a98] main decoder debug: killing decoder fourcc undf', 0 PES in FIFO

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