Public bug reported:

As posted on http://www.mplayerhq.hu/design7/news.html MPlayer 1.4 was released 
in April 2019.
If fixes a compatibility issue with ffmpeg affecting various codecs but not 
evident with all video files (luckily), e.g. hevc and flac, resulting in image 
freeze followed by gray image gradually augmented with delta content until the 
next I frame.

Console log typically looks like:

A: 169.3 V: 167.0 A-V:  2.250 ct:  5.446   0/  0  0%  3%  0.7% 0 0 
[hevc @ 0x7f0fcbcbf4c0]Got unexpected packet after EOF
[hevc @ 0x7f0fcbcbf4c0]Could not find ref with POC 1
[hevc @ 0x7f0fcbcbf4c0]Could not find ref with POC 0
[hevc @ 0x7f0fcbcbf4c0]Could not find ref with POC 4
A: 175.0 V: 173.3 A-V:  1.620 ct:  6.075   0/  0  0%  3%  0.7% 0 0 
A: 180.5 V: 179.5 A-V:  1.007 ct:  6.689   0/  0  0%  3%  0.7% 0 0 
A: 181.3 V: 180.4 A-V:  0.916 ct:  6.780   0/  0  0%  3%  0.8% 0 0 
A: 196.7 V: 194.2 A-V:  2.479 ct:  7.917   0/  0  0%  3%  0.8% 0 0 
[hevc @ 0x7f0fcbcbf4c0]Got unexpected packet after EOF
[hevc @ 0x7f0fcbcbf4c0]Could not find ref with POC 152
[hevc @ 0x7f0fcbcbf4c0]Could not find ref with POC 151
[hevc @ 0x7f0fcbcbf4c0]Could not find ref with POC 150
[hevc @ 0x7f0fcbcbf4c0]Could not find ref with POC 156
A: 209.3 V: 208.2 A-V:  1.082 ct:  9.314   0/  0  0%  3%  0.7% 0 0 

Upstream reports this issue fixed in 1.4:
http://trac.mplayerhq.hu/ticket/2353

The formalities:
1) Description: Ubuntu 20.04 LTS   Release: 20.04
2) mplayer: Installed: 2:1.3.0-8build5
3) smooth and error-free playback
4) in some videos, picture freezes, then is replaced by grey screen, content 
re-eppearing gradually

** Affects: mplayer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1885384

Title:
  version 1.4 available since over 1 year, 1.3 buggy

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