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• File input of avformat_open_input in ffmpeg

  28 février 2016, par Justin Chang

  I’m trying to use function avformat_open_input in FFmpeg to open the file which contains Chinese word.

  For example :

  char* file="C:/測試/baby.mp4";
  
  
  
  avformat_open_input(&pFormatCtx, file, NULL, NULL);

  But, it seems to be failed.

  My question is how do I pass the file path which contains Chinese (or other languages except for English) ?

• How to re-encode a 120fps (or higher) MP4 from my Samsung Galaxy to a 30fps (example) so it plays on Windows like it does on the Samsung

  21 septembre 2022, par remark70

  I have some high fps slow-motion videos (mp4) that I've recorded on my phone, but when I copy them to windows and play them back, they play at the normal speed (or they play really fast), unless I slow down playback but this isn't a good result.

  


  What I'd like to do is re-encode (if that's the right word) the video to a standard fps (such as 30) to get a longer video (keeping all the frames), i.e. a 10 second 120fps would end up being a 40 second video at 30fps.

  


• Trying to save an animation gives error : OSError : Error saving animation to file (cause : [Errno 22] Invalid argument)

  18 octobre 2019, par Esmee

  I am trying to save an animation, but I get the error :

  OSError : Error saving animation to file (cause : [Errno 22] Invalid argument) Stdout : b’’ StdError : b’’. It may help to re-run with logging level set to DEBUG.

  I have installed ffmpeg and also added the path to it in my code. If I add print(animation.writers.list()), it gives ’ffmpeg’ in the list as well so I’m sure my computer can find the right file.

  At the top of my code, I have :

  import matplotlib.pyplot as plt
  
  plt.rcParams['animation.ffmpeg_path'] = 'C:/FFmpeg/bin/ffmpeg.exe'

  And when saving the animation, I have :

  SubplotAnimation_1 = SubplotAnimation(F_vector, eta_atm, Pkid, Tb_sky)
  
  Writer = animation.FFMpegWriter(fps=20, metadata=dict(artist='Me'), extra_args=['--verbose-debug'])
  
  file_string = r'C:/Users/Esmee/Documents/Animations/animation_tryout.mp4'
  
  print(file_string)
  
  SubplotAnimation_1.save(file_string, writer=Writer)

  I have added the r in front of the string, so there are no problems with the /a in the file_string. The folder C :/Users/Esmee/Documents/Animations/ exists for sure, so that also shouldn’t be a problem.
  I have also tried

  Writer = animation.writers['ffmpeg']
  
  mywriter = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800)

  But it doesn’t work either.

  I have looked at animation save gets errror, How can I overcome this key word error and No Moviewriters available, but none of them offers a solution to my problem.

  Does anyone know what the problem could be ? Thanks in advance !