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• How to limit cpu usage for a terminal command that works on m1 mac and macOS Monterey ?

  18 juin 2024, par mcaay

  I have a m1 macbook pro and I regularly need to do some heave processing with ffmpeg. When I do it, all my 8 cores go at it 100% and my cpu temperature goes to 92°C, which I don't feel comfortable about.

  


  I don't really need 100% speed, I'd much rather see 80°C and wait 5x longer for it to finish.

  


  I use Macs Fan Control which sets my fan at 100% at 75°C, so this helps definitely, but is not enough.

  


  I tried ffmpeg -threads 1 parameter but it doesn't make a difference in compressing speed nor temperature, so I assume it just doesn't work.

  


  I tried cpulimit -l 60 -i ffmpeg ... and it doesn't change a thing, so I assume it also doesn't work. cpulimit -l value gives 100% for every core, so cpulimit -l 800 should be 100%, -l 400 should be 50% and -l 60 should be 7.5%.

  


  I tried nice and it is not for my use case. Even with the lowest priority the task uses all available cpu, resulting in 92°C.

  


  Did anybody figure it out for m1 macs already ?

  


• How to execute this ffmpeg command for multiple videos is a folder on Linux terminal

  3 février 2023, par average_grad_student

  I'm trying to change the framerate of my video to 15fps and I need to do that for 100+ videos that are in the same folder

  


  For processing a single video I use the following command-
ffmpeg -i input.mp4 -filter:v fps=fps=15 processed/input_15fpst.mp4

  


  How do I do this for multiple videos in the folder and add a suffix _15fps to them ? I'm not very familiar with Linux programming

  


  Thank you so much !

  


  I tried doing this-
  
for f in *.MP4; do ffmpeg -i "$f" -filter:v fps=fps=15 process/"$f"; done

  


  But I want to rename the file as well, how do I change my loop ?

  


• FFMPEG command works on terminal but not with Java/Kotlin

  11 septembre 2019, par Antony

  I’m trying to use an FFMPEG command for concatenating different videos. The command is

  ffmpeg -i video.mp4 -i video-2.mp4 -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp4

  This command works good when I run on Windows PowerShell. But when I try to run with Kotlin code it doesn’t work.

  val firstVideo = "D:\\Videos\\ffmpeg\\video.mp4"
  
  val secondVideo = "D:\\Videos\\ffmpeg\\video-2.mp4"
  
  val resultPath = "D:\\Videos\\ffmpeg\\result-2.mp4"
  
  
  
  val cmd = "ffmpeg -i $firstVideo -i $secondVideo -filter_complex \"[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]\" -map \"[v]\" -map \"[a]\" $resultPath"
  
  .split(" ").toTypedArray()
  
  
  
  Runtime.getRuntime().exec(cmd)

  I’m not taking any error messages since I’m using FFMPEG cli.

  Also, this piece of Kotlin works perfect when I’m trying to run other FFMPEG operations.