$ fq -d matroska 'matroska_path(".Segment.Tracks[0].TrackEntry[0].CodecID")' avc.mkv
exitcode: 5
stderr:
error: avc.mkv: cannot iterate over: null
$ fq -d matroska 'matroska_path(".Segment.Tracks[0].TrackEntry[0].CodecID") | matroska_path' avc.mkv
exitcode: 5
stderr:
error: avc.mkv: cannot iterate over: null
$ fq -d matroska 'matroska_path(matroska_path(".Segment.Tracks[0].TrackEntry[0].CodecID"))' avc.mkv
exitcode: 5
stderr:
error: avc.mkv: cannot iterate over: null
$ fq -n '"a" | raw | matroska_path(".Segment")'
exitcode: 5
stderr:
error: not matroska format
$ fq -n '1 | matroska_path(".Segment")'
exitcode: 5
stderr:
error: expected decode value but got: number (1)