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It seems something inside libav is not behaving properly. Either MKV is not well-defined in terms of supported formats or
av_codec_get_tag2
should not be used like that. Maybe it doesn't support getting tags for subtitle streams, I have no idea really. The fact is, it prevents adding aubtitles to an MKV container and it's wrong so I removed that check. It's redundant anyway because right after adding a stream we check the result for NULL, so if it didn't work for whatever reason we'dthrow_if
.