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• Using `grab_frame` with `FFMpegFileWriter` Yields Error in the Figure Argument to Subprocess

  7 juillet 2024, par GPU Programmer

  I want to generate an MP4 file using frames produced by a rather complicated simulation. If I have to watch the movie as a side affect of generating it I will not complain too much, but would rather not "show" anything on the screen. The overhead of making the movie is trivial compared to the simulations, so I care much more about clean simple code than about performance.

  


  It seemed natural to use grab_frame with FFMpegFileWriter. The following code seemed right.

  


  fig, ax = plot.subplots(figsize=(6.5, 6.5))

assert(animation.FFMpegFileWriter().isAvailable())
writer = animation.FFMpegFileWriter(fig)
writer.setup(fig, "test1.mp4",224)

with writer.saving(fig,"test1.mp4", dpi=224):
    for i in range(len(frameSeg)):
        PlotFrame(i)
        writer.grab_frame()

# writer.finish()

print("done")


  


  It runs, but yeilds the following error

  


  


  [image2 demuxer @ 0000021fab8c1000] Unable to parse option value "Figure(650x650)" as video rate
[image2 demuxer @ 0000021fab8c1000] Error setting option framerate to value Figure(650x650).
[in#0 @ 0000021fab8c1e00] Error opening input : Invalid argument
Error opening input file ... AppData\Local\Temp\tmpe19ci2wz\tmp%07d.png.
Error opening input files : Invalid argument

  


  


  


  subprocess.CalledProcessError : Command '['ffmpeg', '-framerate', 'Figure(650x650)', '-i', 'F :\Users\Kenne.DESKTOP-BT6VROU\AppData\Local\Temp\tmpe19ci2wz\tmp%07d.png', '-loglevel', 'error', '-vcodec', 'h264', '-pix_fmt', 'yuv420p', '-y', 'test1.mp4']' returned non-zero exit status 4294967274.

  


  


  Did I miss something in setup, is it an installation problem, or is it a bug ?

  


  By the way using FFMpegWRiter with FuncAnimation works ...

  


• Unknown OS 'msys_nt-6.1'. using Mingw on win7 64bit

  9 janvier 2016, par user63898

  I try to compile FFmpeg from source using MSYS2 and MIngW I’m using win7 64 bit .
  using .

  $ ./configure --enable-shared

  I’m getting this error :

  Unknown OS 'msys_nt-6.1'.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solve the problem.

  looking in to config.log
  i see ( the end of the log ) :

  gcc -std=c99 -Wall -O3 -c -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  check_code cc  int test[2*(sizeof(void *) > 4) - 1]
  
  check_cc
  
  BEGIN /tmp/ffconf.e8DJYGJM.c
  
      1   int main(void) { int test[2*(sizeof(void *) > 4) - 1]; return 0; }
  
  END /tmp/ffconf.e8DJYGJM.c
  
  gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -std=c99 -c -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c: In function 'main':
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c:1:22: error: size of array 'test' is negative
  
   int main(void) { int test[2*(sizeof(void *) > 4) - 1]; return 0; }
  
                        ^
  
  check_cpp_condition stddef.h defined(__x86_64__)
  
  check_cpp
  
  BEGIN /tmp/ffconf.e8DJYGJM.c
  
      1   #include 
  
      2   #if !(defined(__x86_64__))
  
      3   #error "unsatisfied condition: defined(__x86_64__)"
  
      4   #endif
  
  END /tmp/ffconf.e8DJYGJM.c
  
  gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -std=c99 -E -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c:3:2: error: #error "unsatisfied condition: defined(__x86_64__)"
  
   #error "unsatisfied condition: defined(__x86_64__)"
  
    ^
  
  Unknown OS 'msys_nt-6.1'. 

  what did i miss ? what did i do wrong ?
  Thanks

• Unknown OS 'msys_nt-6.1'. using Mingw on win7 64bit

  6 juillet 2018, par user63898

  I try to compile FFmpeg from source using MSYS2 and MIngW I’m using win7 64 bit .
  using .

  $ ./configure --enable-shared

  I’m getting this error :

  Unknown OS 'msys_nt-6.1'.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solve the problem.

  looking in to config.log
  i see ( the end of the log ) :

  gcc -std=c99 -Wall -O3 -c -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  check_code cc  int test[2*(sizeof(void *) > 4) - 1]
  
  check_cc
  
  BEGIN /tmp/ffconf.e8DJYGJM.c
  
      1   int main(void) { int test[2*(sizeof(void *) > 4) - 1]; return 0; }
  
  END /tmp/ffconf.e8DJYGJM.c
  
  gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -std=c99 -c -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c: In function 'main':
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c:1:22: error: size of array 'test' is negative
  
   int main(void) { int test[2*(sizeof(void *) > 4) - 1]; return 0; }
  
                        ^
  
  check_cpp_condition stddef.h defined(__x86_64__)
  
  check_cpp
  
  BEGIN /tmp/ffconf.e8DJYGJM.c
  
      1   #include 
  
      2   #if !(defined(__x86_64__))
  
      3   #error "unsatisfied condition: defined(__x86_64__)"
  
      4   #endif
  
  END /tmp/ffconf.e8DJYGJM.c
  
  gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -std=c99 -E -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c:3:2: error: #error "unsatisfied condition: defined(__x86_64__)"
  
   #error "unsatisfied condition: defined(__x86_64__)"
  
    ^
  
  Unknown OS 'msys_nt-6.1'. 

  what did i miss ? what did i do wrong ?
  Thanks