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• How to pipe output of ffmpeg to three different processes ?

  19 juillet 2012, par Richard Knop

  How can I pipe output of ffmpeg without saving it to a file to three different processes ?

  Let's say I have :

  ffmpeg -i input.mpg output.yuv

  I would like to change that in order to avoid saving YUV to physical disk. I would like to pipe it to three different shell commands.

  How to do it ?

• Am I able to stream .mp4 file with the appropriate stream key ?

  8 octobre 2022, par akumakan

  Expected Results :
Right now, this is the code that I am trying to edit. What this does is that I input a name (example.mp4) and it take the contents from a notepad with my stream keys and streams the .mp4 file I input. I want it so that I have .mp4 files with the names as stream keys and the program streams it with the appropriate stream key in the notepad. Is that possible ?

  


  Initial code :

  


  import subprocess

print("Enter the name of the file you want to stream. Include the file extension.\nExample: lofi.mp4 or image.png or pogchamp.gif")
filename = input("\nFilename: ")
with open('stream_keys.txt','r')as keys:
    for key in keys:
        subprocess.Popen(f'ffmpeg -stream_loop -1 -re -i {filename} -stream_loop -1 -i music.mp3 -c:v libx264 -preset veryfast -b:v 3000k -maxrate 3000k -bufsize 6000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 160k -ac 2 -ar 44100 -f flv "rtmp://live.twitch.tv/app/{key}"', shell=True)


  


  What I tried :
Im not proficient with coding and i tried to change the filename into keys.mp4 thinking it will have my expected results.

  


  
print("Edit Names of .mp4 files with twitch stream keys")
open('stream_keys.txt','r')as keys:
    for key in keys:
        subprocess.Popen(f'ffmpeg -stream_loop -1 -re -i {key}.mp4 -stream_loop -1 -i music.mp3 -c:v libx264 -preset veryfast -b:v 3000k -maxrate 3000k -bufsize 6000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 160k -ac 2 -ar 44100 -f flv "rtmp://live.twitch.tv/app/{key}"', shell=True)


  


  thank you

  


• ffprobe | ShowFrames | Packet Size | Divide | Add

  8 mai 2015, par Ben

  I am running this statement in shell

  for file in /path/to/files/*.mp4; do ffprobe -show_frames $file | grep "pkt_size" > ${file}.txt

  done

  It would be great if I could get this information too ;

  1. When I grep pkt_size row with numbers then I want script to - divide
     every pkt_size number with 100,
  2. then add (sum) pkt_size row numbers every after 50 rows.