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• From time to time ffmpeg makes my computer unable to restart

  6 juin 2022, par principal-ideal-domain

  I'm doing very time consuming ffmpeg video editing. That's why I put my commands into a .bat file and run them over night. Usually that works fine but from time to time when I look at the next moring a see an error message of this kind :

  


  

  


  From that state on I didn't find any good way to close the console. When I press the x in the top right corner, it freezes. When I try to kill it using the task manager nothing happens. Even explorer.exe can't be closed using the task manager. A shutdown won't do anything. During the last month I had this problem about three times and the only way I could close it was to long press the power button of the computer until it was turned off this hard way.

  


  Any ideas what to in such situations ? Or even better : Any ideas how to prevent those situations ? What is the reason for the error ? Do you understand the message ? By the way, when the computer is started again then at the next morining and I run the same bat file again everything works fine. So the same error does not repeat and the video is edited nicely.

  


  Edit : Now, about one week after posting this question the problem occurred many more times. It is very annoying. I guess it has to do with the external hard drive connected by USB. Sometimes it randomly interrupts the connection. That might be the reason for the behavior. However that be, I want to learn a solution how to deal with this in future. I don't want to always push the reset button of my computer. I want a proper way to shut it down.

  


• lavc/flacdsp : optimise RVV vector type for lpc16

  14 mai 2024, par Rémi Denis-Courmont

  lavc/flacdsp : optimise RVV vector type for lpc16
  This calculates the optimal vector type value at run-time based on the
  
  hardware vector length and the FLAC LPC prediction order. In this
  
  particular case, the additional computation is easily amortised over
  
  the loop iterations :
  T-Head C908 :
  
      C     V before  V after
  
   1   48.0    214.7     95.2
  
   2   64.7    214.2     94.7
  
   3   79.7    213.5     94.5
  
   4   96.2    196.5     94.2 #
  
   5  111.0    195.7    118.5
  
   6  127.0    211.2    102.0
  
   7  143.7    194.2    101.5
  
   8  175.7    193.2    101.2 #
  
   9  176.2    224.2    126.0
  
  10  191.5    192.0    125.5
  
  11  224.5    191.2    124.7
  
  12  223.0    190.2    124.2
  
  13  239.2    189.5    123.7
  
  14  253.7    188.7    139.5
  
  15  286.2    188.0    122.7
  
  16  284.0    187.0    122.5 #
  
  17  300.2    186.5    186.5
  
  18  314.0    185.5    185.7
  
  19  329.7    184.7    185.0
  
  20  343.0    184.2    184.2
  
  21  358.7    199.2    183.7
  
  22  371.7    182.7    182.7
  
  23  387.5    181.7    182.0
  
  24  400.7    181.0    181.2
  
  25  431.5    180.2    196.5
  
  26  443.7    195.5    196.0
  
  27  459.0    178.7    196.2
  
  28  470.7    177.7    194.2
  
  29  470.0    177.0    193.5
  
  30  481.2    176.2    176.5
  
  31  496.2    175.5    175.7
  
  32  507.2    174.7    191.0 #
   # Power of two boundary.
  With 128-bit vectors, improvements are expected for the first two
  
  test cases only. For the other two, there is overhead but below noise.
  
  Improvements should be better observable with prediction order of 8
  
  and less, or on hardware with larger vector sizes.
  

  • [DH] libavcodec/riscv/flacdsp_init.c
  • [DH] libavcodec/riscv/flacdsp_rvv.S

• Anomalie #3227 : Bug date de publication

  17 septembre 2014, par 毎日 erational -

  quelqu’un sur le forum http://forum.spip.net/fr_258722.html signale une erreur de type avec le mktime