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• Terminal prompt disappears after asyncio script with ffmpeg writing things is run

  8 avril 2022, par David I

  I've followed a simple example https://docs.python.org/3/library/asyncio-task.html#running-tasks-concurrently in trying to learn the basics of asyncio.

  


  It works as expected with most commands however when employed with three ffmpeg commands that take an input and write an output, see the example below, the terminal window prompt becomes invisible after the script has (seemingly successfully run). It responds to typed commands and shows the result but the input isn't shown until I start a new terminal session. It's the same with Code's bash terminal as with Kitty.

  


  It doesn't seem to be a "write to file system concurrantly" problem as the echo lines don't produce the problem. The ffprobe commands don't produce it either but "command1" and 2 and 3 always do. It's the same with other ffmpeg commands that write to the file system via a conversion or a split of an audio input file.

  


  The processes exit with 0 and ffmpeg issues most output to stderr so the output looks like

  


  


  ['ffmpeg -y -i "01 Dia Artio.m4a" "oof1.wav"' exited with 0]
[stderr]
ffmpeg version N-104926-gc8b5f2848d Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (GCC)...

  


  


  import asyncio

async def run(cmd):
    proc = await asyncio.create_subprocess_shell(
        cmd,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE)

    stdout, stderr = await proc.communicate()
    print(f'[{cmd!r} exited with {proc.returncode}]')
    print(f'[stderr]\n{stderr.decode()}')

async def main():
    # Schedule three calls *concurrently*:
    command1 = "ffmpeg -y -i '01 Dia Artio.m4a' 'oof1.wav'"
    command2 = "ffmpeg -y -i '03 Cleansing.m4a' 'oof3.wav'"
    command3 = "ffmpeg -y -i 'The Cranberries - 10 - Dreaming My Dreams.flac' 'oof2.wav'"

    cat1 = "echo 'cat' > cat.txt"
    cat2 = "echo 'kitteh' > kat.txt"
    cat3 = "echo 'eirlyss' > eirlyss.txt"

    ffprobe1 = "ffprobe oof1.wav"
    ffprobe2 = "ffprobe oof2.wav"
    ffprobe3 = "ffprobe oof1.wav"
    await asyncio.gather(
        run(command1),
        run(command2),
        run(command3)
    )
    
 
asyncio.run(main())


  


  This problem has only happened with this combination of asyncio and ffmpeg and it appears consistent and I would very much like to know what might be the cause of it.

  


  I'm on Fedora 35 with Python 3.10.4 and a self built (via ffmpegs instructs) ffmpeg from a few months back).

  


• ffmpeg - Creates a Terminal like Text Video Instead of Slide Show Of Images

  15 novembre 2017, par RAJESH KUMAR ARUMUGAM

  I am using ffmpeg encoder to render Images in my Android App with the Help of this Library

  The following Command is used to Render video from a list of images.

  String command[] = {"-r","1/5","-i",gpxfile.getAbsolutePath(),"-c:v","libx264","-vf","fps=25","-pix_fmt","yuv420p",root.getAbsolutePath()+"/"+"video.mp4"};

  and here the gpxfile is my text file that contains the following

      file '/storage/emulated/0/DCIM/Camera/P_20170807_143916.jpg'
  
      duration 2
  
      file '/storage/emulated/0/DCIM/Pic/P_20170305_142948.jpg'
  
      duration 5
  
      file '/storage/emulated/0/DCIM/Camera/P_20170305_142939.jpg'
  
      duration 6
  
      file '/storage/emulated/0/DCIM/Pic/P_20170305_142818.jpg'
  
      duration 2

  My Problem is While Running the Command it renders a Terminal Like Black Screen with the TextPaths inside the file instead of a Video...!!!
  Any Suggestions...??

  Here is my Project Source Code

• how to run ffmpeg terminal (mac) command in java

  18 avril 2016, par Hasan

  I use FFmpeg codec in order to do the video conversion. This time I have a huge number of videos, so I am trying to do the video conversion automatically.

  I am trying to do so like this in java.

  Runtime.getRuntime().exec("ffmpeg -video_size 1920x1080 -r 25 -pixel_format yuv422p -i input.yuv -vf yadif  output.yuv");

  But my java program returns the following error :

  Cannot run program "ffmpeg": error=2, No such file or directory

  Does anyone has any clue how I can do it in java ?