JACOsub demuxer, decoder and muxer.

libavcodec/avcodec.h

@@ -423,6 +423,7 @@ enum CodecID {
     CODEC_ID_SRT,
     CODEC_ID_MICRODVD   = MKBETAG('m','D','V','D'),
     CODEC_ID_EIA_608    = MKBETAG('c','6','0','8'),
+    CODEC_ID_JACOSUB    = MKBETAG('J','S','U','B'),
 
     /* other specific kind of codecs (generally used for attachments) */
     CODEC_ID_FIRST_UNKNOWN = 0x18000,           ///< A dummy ID pointing at the start of various fake codecs.