Could not open MPEG file: mpgtmp.mpg, because it never existed.

The latest versions of mencoder, mplayer and the 2.2b version of mpeg_stat return this error, running on either Debian 10 or Ubuntu 18.04.04:


mpeg_stat -- MPEG Analyzer for MPEG I video streams (version 2.2b)
MPlayer 1.3.0 (Debian), built with gcc-8 (C) 2000-2016 MPlayer Team
MEncoder 1.3.0 (Debian), built with gcc-8 (C) 2000-2016 MPlayer Team
It seems we found all programs :)...continuing
______________________________________________
Converting input.avi
Transcoding video:   done
Transcoding audio:   done
Could not open MPEG file:  mpgtmp.mpg

Usage:  mpeg_stat [options] [mpeg_file]
Options:
  -quiet:        Turn off output of frame types/matricies as encountered
  -verify:       Do more work to help assure the validity of the stream
             (slows processing somewhat)
  -start N:          Begin collection at frame N (first frame is 1)
  -end N:        End collection at frame N (end >= start)
  -histogram file:   Put detailed histograms into file
  -qscale file:      Put qscale information into file
  -size file:        Write individual frame type and size into file
  -offsets file:     Write high level header offsets into file
  -block_info file:  Put macroblock usage into file
  -dct           Puts decoded DCT info into block file
  -rate file:        Put instantaneous rate information in file
  -ratelength N:     Measure bitrate per N frames, not one second's worth
  -syslog file:      Store parsing of systerm layer into file
  -userdata file:    Store user data information into file
  -time:         Measure time to decode frames
  -all file:         Put all information into files with basename file

A single dash (-) may be used to denote standard in/out in place of a filename.

mpeg_stat -- MPEG Analyzer for MPEG I video streams (version 2.2b)

Writing offset information to stat.tmp
Error using mpeg_stat ... see error above
Removing temporary files

artm / dpgconv

Could not open MPEG file: mpgtmp.mpg, because it never existed. #3