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• FFmpeg, Record Multiple different Stream

  14 janvier 2021, par veysel

  How many stream can I record using Raspberry Pi 4 2 GB simultaneously by FFmpeg ? i tried 30 different stream URLs, it seems working good but, i am not trusting that everything is okay because when i try to record 50 same stream simultaneously, some records are not same. I mean when i compare 2 same mp3 stream records these are not the same, there are some differences between the two of them. Are there any method that i can calculate how many stream can I record simultaneously in theory ?

  


  Here that i used code

  


  for i in range(50):
    os.system("ffmpeg -i one_stream_URL -c copy output"+str(i)+".mp3 &")


  


• FFmpeg : fade in and fade out doesn't work with filter_complex

  7 avril 2022, par George

  I have several audio files in Mac application that I need to merge so that the finished file starts with a fade in, then crossfade between audio files, and ends by fade out.

  


  I have the following query and it works only partially. Crossfade works perfectly, but fade in and fade out does not work at all.
-y -i '/Users/george.lucas/Desktop/Task5/Task5/Task5/Sounds/billie_eilish_happier_than_ever.mp3' -i '/Users/george.lucas/Desktop/Task5/Task5/Task5/Sounds/Linkin_Park_California.mp3' -i '/Users/george.lucas/Desktop/Task5/Task5/Task5/Sounds/Rammstein â Du riechst so gut.mp3' -filter_complex "\[0\] atrim=60.780234547806856:152.71856767246777, afade=enable='between(t, 0, 60.0)':t=in:st=0:d=60.0 \[outdf0\]; \[1\] atrim=37.65177079420725:153.98897875714704  \[trm1\];\[outdf0\]\[trm1\] acrossfade=d=60.0:c1=exp:c2=exp \[outdf1\]; \[2\] atrim=106.79850757480907:196.73409290096407  \[trm2\];\[outdf1\]\[trm2\] acrossfade=d=60.0:c1=exp:c2=exp \[outdf2\]; \[outdf2\] afade=enable='between(t,29.935585326155007, 60.0)':t=out:st=29.935585326155007:d=60.0 \[outtotal\] " -map \[outtotal\] '/Users/george.lucas/Library/Containers/com.someinitials/Data/Library/Application Support/mergedfile.m4a'

  


• How to convert all files in a specific directory using batch script

  30 mars 2017, par sks

  I have videos in a folder of .h264 format and i want to convert them to mp4. now by default i can use ffmpeg to do this :
  Here is the command :

  ffmpeg -i youtube.flv -c:v libx264 filename.mp4

  But, new h264 files are being added and I want to keep converting the videos so as to use it for my python script.

  I know i can use this to initialize the variable

  SET /A num=1

  But how do i write a batch script to take all the videos from the directory one by one even though there new videos being added ?

  I wrote this but this isn’t working :

  @echo off
  
  SET /A num=1
  
  
  
  for file in E:\Records\1\*.h264
  
  do
  
      ffmpeg -i "$file" -c:v libx264 E:\Recods\1\converted\%num%.mp4
  
      move E:\Records\1\"$file" E:\Records\1\done\
  
      set /A num=%num%+1
  
  done
  
  PAUSE

  I am making a done folder and moving the videos that have been converted there and in converted folder i am putting converted videos.. Now i just have to run a task scheduler each hour so that if there is a new entry it should convert it and move it to appropriate folder.