ffmpeg's decoder error [libaribcaption @ 0000025ee70e1e00]

[shibababa]

I got the following error in the decoder process inside ffmpeg.

[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 a368b4ce2212ef80e2bf3d68559f5151 to Unicode
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
Last message repeated 2 times
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
Last message repeated 3 times
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
Last message repeated 5 times
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 a368b4ce2212ef80e2bf3d68559f5151 to Unicode
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
Last message repeated 5 times
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
Last message repeated 1 times
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
Last message repeated 1 times
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
Last message repeated 2 times
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
Last message repeated 2 times
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 33d4c5243a45503d43fbb858a728664d to Unicode
[libaribcaption @ 0000025ee70e1e00] DecoderImpl: Cannot convert unrecognized DRCS pattern with MD5 a368b4ce2212ef80e2bf3d68559f5151 to Unicode

I presume that there is a character string that has not been converted, but how should I deal with it?

[xqq]

Unfortunately, I think this should not be treated as an error (I wonder if it is outputted as a warning).
and unfortunately, the libaribcaption module in libavcodec doesn't provide a way to dump the DRCS bitmap at this time.

[shibababa]

Thanks for your reply.
Like I can freely convert characters by editing the UNICODE_cc_DRCS file with Caption2Ass, can't I do the same with libaribcaption?
In order for me to use Caption2Ass, I have to use TsSplitter, but TsSplitter often fails to process m2ts files, so it's not practical, so I'm trying FFmpeg.