[FFmpeg-trac] #8452(undetermined:closed): slow png decode starting with ffmpeg-3.3.1

FFmpeg trac at avcodec.org
Sat Jan 18 21:24:13 EET 2020

#8452: slow png decode starting with ffmpeg-3.3.1
             Reporter:  DonMoir      |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
                                     |  needs_more_info
             Keywords:  regression   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by DonMoir):

 The first thing I did was run the current get head which I mentioned in
 initial post and became aware of the problem. Then looked back to find
 version where it became a problem.  I mentioned using ffplay and
 observation is not really the best way to test at least for me. There is
 extra overhead in play and sort of guessing game. It is really easy to
 time the decode and then you know without a doubt. Also gives you ability
 to fine tune and get better stats.

 I realize worksforme does not mean it works for others. But I have had to
 fight to get bugs fixed that were closed and tagged incorrectly. A few I
 had to mention it to Michael and were fixed in minutes. Much less than
 then the hours, days, weeks arguing with Carl. So in this case worksforme
 and closed with no comments was enough to convince me it was dead.

 If I was setup for it I could probably tell you exactly where the problem
 is quickly as it appears somewhat straight forward (maybe). Will do that
 soon but busy for a few weeks. I found another problem with png which is
 unrelated to this thread and some problems with hardware decoding. This
 after just a few hours of testing. I don't know what all I will run into
 with more complete testing. One thing for sure is I am not going to waste
 time arguing common sense things with Carl.

Ticket URL: <https://trac.ffmpeg.org/ticket/8452#comment:11>
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