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• Using FFmpeg and IPython

  25 février 2014, par Kreger51

  I am relatively new to Python (I used MATLAB a lot more). I essentially want to be able to make and save animations. So I went and checked how it's done and found this :
  http://jakevdp.github.io/blog/2012/08/18/matplotlib-animation-tutorial/

  I straight up copied/pasted the code in an IPython Notebook.

  I understand that ffmpeg must be installed, which I thought I did (according to http://www.wikihow.com/Install-FFmpeg-on-Windows). The path is C :/ffmpeg. It does work when I try ffmpeg -version in the command prompt. It also works in WinPython's command prompt. I don't know if it helps, but the path for Ipython is :
  C :\Users\Sal\WinPython-32bit-3.3.2.3\python-3.3.2\Scripts /

  However, it still doesn't work. The error given is :
  AttributeError : 'str' object has no attribute 'saving'
  This error occurs at the .save command of course.
  I even tried to add what's below. Doesn't do anything extra.
  writer = 'ffmpeg'

  I am using Windows 7, WinPython3.3.

  Thank you very much

• Aws lambda audio features extraction ( Not enough storage -Layers )

  6 novembre 2019, par Amit Neuhaus

  We have IOT sensors that uploads wav files into S3 Bucket.

  We want to be able to extract sound features from each file that is getting uploaded (create obj event) with aws lambda

  For that we need :

  • python librosa or pyAudio analysis package + numpy and scipy. ( 240mb unzziped)
  • ffmpeg ( 70mb unzziped)

  As you can see there is no way to put them all together in same lambda package (250mb uncompressed max). And im getting an error when not including the ffmpeg in the layers when gathering the wav file :

  [ERROR] FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe': 'ffprobe'

  which is related to ffmpeg.

  We are looking for implementation recommendation, we thought about :

  1. Putting the ffmpeg file in s3 and getting it every single invoke ( without having to put it in the layers. ( if it is even possible)

  2. Chaining two lambdas : 1 for processing the input file through ffmpeg and puting the output file in abother bucket > 2 function invoked and extracting features from the processed data. ( using SNS / chaining mechanism) ( if it is even possible)

  3. Move to EC2 where there we will have a problem with concurrent invokation accuring when two files uploads at the same time.

  there has to be and easier way, ill be glad to hear for other opinions before diving into implementation,
  Thank you all !

• Extract frames from a video (errors from using grabVideoStills and ffmpeg)

  6 juin 2023, par PBJB

  I'm attempting to extract frame-by-frame images from a set of videos. I've tried to do this using grabVideoStills and ffmpeg but I can't get either to work.

  


  Here is my grabVideoStills command :

  


    grabVideoStills(
    01_H35_combined_small.mp4,
  imageDir = "C:/Users/pb/OneDrive/PD/MAG/split_stimuli",
  overWriteDir = FALSE,
  sampleWindow = 1
)


  


  And I get the following error :

  


      imageDir = "C:/Users/pb/OneDrive/PD/MAG/split_stimuli",
Error: unexpected ',' in "imageDir = "C:/Users/pb/OneDrive/PD/MAG/split_stimuli","
>   overWriteDir = FALSE,
Error: unexpected ',' in "  overWriteDir = FALSE,"
>   sampleWindow = 1
> )
Error: unexpected ')' in ")"


  


  Here is my ffmpeg command :

  


  ffmpeg - i 01_H35_combined_small.mp4 %04d.png


  


  And I get the following error message :

  


  Error: unexpected numeric constant in "ffmpeg - i 01"


  


  One thought I had about this error is that it doesn't like the number at the start of the filename, I've tried using quotation marks but it yields a similar error :

  


  Error: unexpected string constant in "ffmpeg - i "01_H35_combined_small.mp4"" 


  


  Any help would be greatly appreciated !