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• Data from Python to FFMpeg

  3 mai 2016, par user2956849

  I’m using Python and FFMpeg under Windows OS.

  The problem is to create a single video file from images and audio tracks, stored in memory as numpy array.

  I have done it in 2 steps, but I think it can be done better and faster :

  Firstly, i create video file (using pipe:0 to transfer data from python to FFMpeg)

  ffmpeg -y -f rawvideo -vcodec rawvideo -s 1920x1080 -pix_fmt bgr24 -r 5.00 -i pipe:0 -an -vcodec libx264 -preset medium -pix_fmt yuv420p video.avi

  Then from this file and audio track from pipe I create needed file :

  ffmpeg -y -f s16le -acodec pcm_s16le -ar 44100 -ac 1 -i pipe:0 -i video.avi -c:v h264 -c:a ac3 videoANDaudio.avi

  Is it possible to do it just in one FFMpeg call ? Can I use 2 pipe streams to transfer data ? I also tried named pipe, but I found nothing in Google.

  PS. May be there is any better way to do this ?

• Renaming ffmpeg to something unique when running on linux [duplicate]

  30 janvier 2019, par glenskie16

  This question already has an answer here :

  • Start a process with a name
    
    2 answers
    

  I am currently trying to run multiple instances of ffmpeg on my vps, and i have a script that checks every 15 seconds to see if its still running. This script checks for "ffmpeg". What i need is to have it check for ffmpeg123 as example so that there can be multiple scripts to check if a specific ffmpeg has crashed so it can restart it.

      while [ 1 ]; do
  
  
  
      if pgrep -x "ffmpeg" > /dev/null
  
      then
  
          echo "Running"
  
      else
  
          //restart ffmpeg
  
      fi
  
      sleep 15
  
  done

  So what i would like is to have like 5 differently named ffmpeg’s running as like ffmpeg1,ffmpeg2,ffmpeg3, etc.

  Thank you in advanced ! FFMPEG is also started within this script.

• H264 fragments to Image Files

  19 novembre 2020, par Harsh Solanki

  first time here so be gentle.

  


  I followed following :

  


  H264 ByteStream to Image Files

  


  with this, I am able to correctly generate an image for the very first fragments.

  


  However, when I am trying for the subsequent fragments (.h264), I am getting following error :

  


  [h264 @ 0x5a8f640] Format h264 detected only with low score of 1, misdetection possible !
[h264 @ 0x5a8f640] Could not find codec parameters for stream 0 (Video : h264, none) : unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, h264, from 'frame-0003.h264' :
Duration : N/A, bitrate : N/A
Stream #0:0 : Video : h264, none, 24 tbr, 1200k tbn, 48 tbc
Output #0, image2, to 'output.png' :
Output file #0 does not contain any stream

  


  My fragments are named in following manner :

  


  frame-0001.h264, frame-0002.h264 ..... frame-1500.h264

  


  Is there any way I can create images for all the 1500 fragments. Any guidance, help or code is very appreciated.