This is actually a bug, that just doesn't affect anything. First of all, the logic of functions that work with ff_codec_bmp_tags is "One tag -- one codec id". Also if you write this tag as MPEG2VIDEO, and then read the header (all by ffmpeg), it will interpret as MPEG1VIDEO:
ffmpeg -i whatever.mxf -vcodec mpeg2video test.avi && gdb ffprobe_g (gdb) break avi_read_header (gdb) r -i test.avi (gdb) finish (gdb) p s->streams[0]->codecpar->codec_id $1 = AV_CODEC_ID_MPEG1VIDEO
0001-avformat-riff-remove-useless-tag-correlation-mpg2-AV.patch
Description: Binary data
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