/usr/share/mlt/presets/consumer/avformat/atsc_1080p_50/DNxHD is in libmlt-data 0.9.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | f=mov
vcodec=dnxhd
vb=185M
threads=2
acodec=pcm_s16le
meta.preset.extension=mov
meta.preset.note=A lightly compressed intermediate codec developed by Avid also known as SMPTE VC-3
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