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• Python, FFMPEG : Redirecting output of FFMPEG subprocess call to a string

  31 décembre 2019, par user1452030

  I’ve managed to run an FFMPEG command using the subprocess module as shown below :

  output = subprocess.check_output(command, shell=True)

  This works fine, but it prints the verbose FFMPEG output to console. The program I’m writing is supposed to run for hundreds/thousands of files in a batch and I don’t want detailed outputs for every file processed, unless the user chooses to do so. Can I redirect the console outputs and errors to strings, so that I can decide when I should and shouldn’t print them ?

  This might be lame, but I tried the following snippet :

  outputBuffer = BytesIO()
  
  output = subprocess.check_output(command, shell=True, stdout=outputBuffer)

  But it gave me the following error :

  ValueError: stdout argument not allowed, it will be overridden.

  I saw other examples where the POpen interface was used, but given that I’m not communicating with the external command as it is running, and that I need to run this for a large number of items, I’d prefer something simpler, if possible.

  Thanks in advance !

  Note : I’ve found lots of questions in this broad topic, but I couldn’t find anything perfectly relevant to my situation.

• how to redirect adb screenrecord output to pc(windows/linux) storage

  30 novembre 2018, par asullaherc

  In linux, I use following code to cast android screen to pc, it work well

  adb shell "screenrecord --time-limit 1 --output-format=h264 -; screenrecord --time-limit 180 --output-format=h264 -" | ffplay -

  so I think exist way to redirect screenrecord output to pc storage, so I try following code

  adb shell "screenrecord --time-limit 1 --output-format=h264 -; screenrecord --time-limit 180 --output-format=h264 -" >> /tmp/t.mp4

  but the output video file cannot be opened by vlc and google-chrome, how to fix it ?

  ffplay is belongs ffmpeg, so I guess exist similar cli in ffmpeg to output input video streaming into video file

• Running FFmpeg from AWS

  11 mai 2019, par Jay

  This code works perfectly from my local machine.

  import subprocess
  
  
  
  p = subprocess.call('ffmpeg -r 1 -loop 1 -i "ep1.png" -i "ep1.mp3" -acodec copy -r 1 -shortest -vf scale=1280:720 ep1.flv',shell=True)

  I would like to run it from AWS

  Lambda code

  import boto3
  
  
  
  import subprocess
  
  
  
  s3 = boto3.client('s3')
  
  
  
  
  
  def lambda_handler(event, context):
  
  
  
      ep1PNG = s3.get_object(Bucket='my-buc',Key='ep1.PNG')
  
      ep1MP3 = s3.get_object(Bucket='my-buc',Key='ep1.mp3')
  
  
  
      p = subprocess.call(
  
      '/opt/ffmpeg/ffmpeg -r 1 -loop 1 -i ep1PNG -i ep1MP3 -acodec copy -r 1 -shortest -vf scale=1280:720 /tmp/ep1.flv', shell=True)
  
  
  
  
  
      # TODO implement
  
      return {
  
          'statusCode': 200,
  
  
  
      }

  Questions

  Are these correct inside subprocess.call() ?

  /opt/ffmpeg/ffmpeg  #<-----Is this correct ?
  
  ep1PNG           #<-----Is this correct ?
  
  ep1MP3          #<-----Is this correct ?
  
  /tmp/ep1.flv   #<----- Not Sending Output to S3 Bucket 

  Please comment if I’m heading in the right direction been trying this for about a week now

  ffmpeg is uploaded as a layer