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• FFMPEG Images to video - 'file not found' error in command - I'm sure it's something obvious

  8 août 2017, par jgads

  I’m running this command on my Android phone with an FFmpeg library. It works great for combining videos into one resultant video, but not with images. Here’s the command :

   -framerate 4 -start_number 0 -i '/storage/emulated/0/Pictures/phototest/%3d.jpg' -c:v libx264 -r 30 -pix_fmt yuv420p /storage/emulated/0/Pictures/phototest/result.mp4

  The error is :

  '/storage/emulated/0/Pictures/phototest/%3d.jpg': No such file or directory

  The images are just consecutively named, e.g. 1.jpg, 2.jpg and so on, and they’re definitely there - though I think FFMPEG is taking the image file name literally rather than interpreting it. I’m missing something obvious here, I’m sure of it. I looked round StackOverflow and the whole ’%3d’ wildcard is supposed to work ! Any ideas ?

  EDIT : Running the command with just the first image (1.jpg) works fine. Definitely an issue with the wildcard. In addition, running the command without the image path in quotes doesn’t seem to work either.

  EDIT 2 : Adding ’img’ in front of every file so that it it’s ’img1.jpg’, ’img2.jpg’ and so on doesn’t work either. Is there a way to pass multiple images separated by ’|’ like the concat command ?

• imagemagick gradient mask file creation

  6 avril 2016, par lang2

  I’m playing with this creative script here : http://www.fmwconcepts.com/imagemagick/transitions/. The plan is to mimic what happens with the script with ffmpeg and generate video with transition effects between pictures. My current understanding is this :

  1. I have two pictures A and B.
  2. I need in between a couple of pictures (say 15) that are partially A and partially B.
  3. To do that I use the composite -compose src-over A.jpg B.jpg mask-n.jpg out.jpg command.
  4. During the process, the mask-n.jpg gets generated automatically that gradually change from all black to all white.
  5. Depends on the mathematically equations, the way the transition effect looks is different.

  In one of the example, Fred the author gave this :

  convert -size 128x128 gradient: maskfile.jpg

  This will generate a image like this :
  

  This is partially black and partially white. For the transition to work, I’ll need an all white one and an all black one and a couple of others in between. What’s the magical command to do that ?

• Why is ffmpeg-python throwing a codec error here ?

  15 octobre 2019, par TwentyPenguins

  I’m trying out ffmpeg-python for the first time and I’m hitting what looks like a complex error surprisingly early on.

  Here’s my complete code as it stands :

  from tkinter import filedialog
  
  import ffmpeg
  
  
  
  sourceFile = filedialog.askopenfile()
  
  targetFile = filedialog.asksaveasfilename()
  
  
  
  stream = ffmpeg.input(sourceFile, ss=0, format='mov')
  
  stream = ffmpeg.output(stream, targetFile, format='mp4')
  
  ffmpeg.run(stream)

  In my head, this ought to be simple. The user browses to an existing MOV file (a standard h264 file which ’normal’ FFmpeg.exe can handle no problem on a Windows command line), then selects an output file for an MP4 to be saved, then FFmpeg is called and an MP4 file is converted from the MOV.

  However, regardless of what source file I choose, I am always hitting this error :

    File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\ffmpeg\_ffmpeg.py", line 85, in output
  
    File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\site-packages\ffmpeg\_run.py", line 285, in run_async
  
      args, stdin=stdin_stream, stdout=stdout_stream, stderr=stderr_stream
  
    File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\subprocess.py", line 775, in __init__
  
      restore_signals, start_new_session)
  
    File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\subprocess.py", line 1119, in _execute_child
  
      args = list2cmdline(args)
  
    File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\subprocess.py", line 530, in list2cmdline
  
      needquote = (" " in arg) or ("\t" in arg) or not arg
  
    File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\encodings\cp1252.py", line 23, in decode
  
      return codecs.charmap_decode(input,self.errors,decoding_table)[0]
  
  UnicodeDecodeError: 'charmap' codec can't decode byte 0x90 in position 41: character maps to <undefined>
  
  </undefined>

  The position number changes depending on the file but the error is always ’charmap’ codec can’t decode byte 0x90 in position [x] : character maps to < undefined >

  Please can somebody point me to where I may be going wrong on this one ? I feel the answer is staring me in the face but I’m not seeing it.