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• Why is ffmpeg taking up so much memory when I try to stop a livestream ?

  4 juillet 2019, par FiskFan1999

  When the ffmpeg function is running, there are no problems with memory and everything runs smoothly. However, when I attempt to stop the stream/ffmpeg by pressing q (or ctrl-c), ffmpeg freezes, doesn’t take any other inputs, and suddenly takes up an obscene amount of memory.

  I am using ffmpeg to livestream on youtube. I am using a MacBook Mid 2015 running macOS Mojave.

  here is the function I am using with ffmpeg.

  ffmpeg -re -f lavfi -i testsrc2=s=1280x720:r=60 -re -i "INPUT FILE.mp3" -vcodec libx264 -pix_fmt yuv420p -preset "ultrafast" -r 60 -g 120 -b:v 6168000 -filter_complex "[0]scale=1280:720;[1]aloop=start=0:size=202*44100:loop=-1" -acodec libmp3lame -ar 44100 -threads 3 -b:a 640000 -qscale:a 5 -bufsize 512k -f flv ${YOUTUBE_URL}/${KEY}

  The command runs perfectly and as expected while it is running. At this point, in Activity Monitor I can see that ffmpeg seems to peak to about 101 MB. When I press q, which is the button to end the encoding, if the stream had been going for about ten minutes ffmpeg freezes and in Activity monitor the ffmpeg command appears to climb to several gigabytes of memory without any sign of stopping. The most I have noticed is about 6 GB before I killed the command. Ffmpeg seems to be writing almost a gigabyte of data into memory a second. In fact, this slows down my computer when it occurs and threatens to completely fill up my memory.

  When this occurs, there are no error messages (except for warnings about running out of memory) and the terminal running ffmpeg seems to not respond to any kill commands, and the only way to alleviate the situation is to force close the terminal window itself.

  I’m wondering if somehow I am creating a memory leak issue or if I wrote something wrong or didn’t include something that would be necessary for live-streaming with ffmpeg.

• Truncate / Trim audio file using start and stop times [duplicate]

  19 juin 2019, par richierich

  This question already has an answer here :

  • How do you convert an entire directory with ffmpeg ?
    
    15 answers
    
  • How to iterate over files in a directory with Bash ?
    
    5 answers
    

  I am attempting to truncate a .wav file from any length to 1 minute by using the ffmpeg package. once truncated, I want to save the file in another directory.

  I am able to do so with he following command :

  ffmpeg -i ~/test/audio.wav -ss 00:00:00 -t 00:01:00 -async 1 ~/test/test-minute/*.wav

  But my issue is that I would like to be able to iterate through multiple files within my /test directory and truncate each .wav file, then place the new file in the new /test/test-minute directory.

  Also, I would like to keep the same name for each file when it is created in the new directory. Thus, when a copy of audio.wav is truncated to 1 minute, the new file will also be named audio.wav in the other directory.

  In short, how do I perform the truncate process across the entire directory ?

• Handling an arbitrary number of start and stop time pairings to cut a movie file down

  9 juin 2019, par Kieran

  I am writing a function that takes a list of tuples and a file path string as arguments and outputs a cut down video that only includes the frames that fall inside the start/stop pairings provided.

  I’m getting stuck because I am not sure whether the .trim() method of the ’infile’ object is altering the existing object or or creating a new one or doing something else entirely.

  the list of start/stop frame pairings can be arbitrarily long, every example I have found has been for a specific number of start and stop pairings and I can’t find anything describing what data structure needs to be passed back to ffmpeg.concat().

  My code is displayed below :

  import ffmpeg
  
  
  
  frameStamps = [(50,75),(120,700),(1250,1500)]
  
  videoFilePath = 'C:/Users/Kieran/Videos/testMovie.mp4'
  
  outputFolder = 'C:/Users/Kieran/Videos/'
  
  
  
  def slice_video(frameStamps, videoFilePath, outputFolder):
  
  
  
      originalFile = ffmpeg.input(videoFilePath)
  
  
  
      for stamp in frameStamps:
  
          ffmpeg.concat(originalFile.trim(start_frame=stamp[0], end_frame=stamp[1]))
  
  
  
  
  
      ffmpeg.output(outputFolder + 'testoutput.mp4')
  
      ffmpeg.run() 
  
  
  
  slice_video(frameStamps, videoFilePath, outputFolder)

  Now I am able to get the following when I individually print out originalFile.trim() which are getting recognised in the console as "FilterableStream" objects

  trim(end_frame=75, start_frame=50)[None] <29b4fb0736ec>
  
  trim(end_frame=700, start_frame=120)[None] <c66c4e1a48f5>
  
  trim(end_frame=1500, start_frame=1250)[None] &lt;13e0697a5288>  
  
  </c66c4e1a48f5>

  and I have tried passing them back as a list, dictionary and tuple and haven’t been able to get it working

  Output Errors :

    File "C:/Users/Kieran/Example.py", line 21, in slice_video
  
  ffmpeg.output(outputFolder + 'testoutput.mp4')
  
  
  
    File "C:\ProgramData\Anaconda3\lib\site-packages\ffmpeg\_ffmpeg.py", line 94, in output
  
  return OutputNode(streams, output.__name__, kwargs=kwargs).stream()
  
  
  
    File "C:\ProgramData\Anaconda3\lib\site-packages\ffmpeg\nodes.py", line 282, in __init__
  
  kwargs=kwargs
  
  
  
    File "C:\ProgramData\Anaconda3\lib\site-packages\ffmpeg\nodes.py", line 170, in __init__
  
  self.__check_input_len(stream_map, min_inputs, max_inputs)
  
  
  
    File "C:\ProgramData\Anaconda3\lib\site-packages\ffmpeg\nodes.py", line 149, in __check_input_len
  
  raise ValueError('Expected at least {} input stream(s); got {}'.format(min_inputs, len(stream_map)))
  
  
  
  ValueError: Expected at least 1 input stream(s); got 0