I use ffmpeg to embed .ssa subtitles into mkv, but ffprobe recognizes that the subtitle is ass format.
ffmpeg -i input.avi -i input.ssa -map 0:0 -map 0:1 -map 1:0 -c copy demo.mkv
Also, I learned that ssa subtitles also support MP4, but when I use the command to convert to MP4 that ffmpeg report error:could not find tag for codec ass in stream #2, codec not currently supported in container
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How can I solve this problem?