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• Removing / Overlaying logo on mp4 video format with ffmpeg on linux

  12 septembre 2020, par SilverShadow

  I'm trying to remove a logo from an .mp4 video file with ffmpeg on linux machine without re-encoding (for preserving the same quality) with the following command :

  


  ffmpeg -i input.mp4 -vf delogo=x=270:y=190:w=40:h=40 -c:a copy output.mp4 


  


  and it gives me the following errors :

  


  Unrecognized option 'vf'


  


  then a new error came up :

  


  Unable to find a suitable output format for 'delogo=x=270:y=190:w=40:h=40'


  


  ffmpeg is always updating and it seems that they change command line arguments a lot so any material or tutorial I find online seems to get outdated quickly ...

  


  I reviewed the documentation but can't get it to work, I think I'm missing something...?

  


  So : What is the correct command line in linux shell ? Also, how to view or find out the exact coordinates of the area to be removed before actually removing the logo ? And how can I overlay a solid color in a certain area instead of removing the logo transparently ?

  


• Discrepancy in Video Quality with FFmpeg Encoding on Different Laptops [closed]

  17 juillet 2024, par sonusi

  I’m experiencing an issue where encoding the same video with identical FFmpeg commands on two different laptops results in different output quality. Here’s the command I’m using :

  


  ffmpeg -hwaccel none -loglevel verbose -i test_video.mp4 -r 30 -c:v libx264 -profile:v baseline -level 1.0 -b:v 10000k -s 1920x1080 -preset medium -force_key_frames "expr:gte(t,n_forced*1/30)" -c:a aac -b:a 32k -ac 1 -ar 22050 ENC_test_video.mp4



  


  Both laptops are running VirtualBox 7.0 with the same virtual machine configuration. However, one laptop produces a clear and high-quality encoded video, while the other results in a noisy and lower-quality output.

  


  Details :
VirtualBox Version : 7.0
Operating System inside VMs : Ubuntu 20.04

  


  I’ve ensured that both systems have the same FFmpeg version, yet the output quality differs. What could be causing this discrepancy, and how can I ensure consistent video quality across both systems ?

  


  Thanks in advance for your help !

  


• PHP's exec() not executing command for FFmpeg

  16 septembre 2011, par tundoopani

  I have installed ffmpeg on my server and it works fine via my terminal. I'm able to successfully convert a file to webm format, so I'm sure the installation is fine. I'm also sure that I only have one installation of ffmpeg installed on my machine.

  A problem arises when I try to convert files through PHP via PHP's exec(). When I run the same commands, I ran in the terminal, nothing happens. I looked around stackoverflow and other parts of the net for some help. I tried this to see the output :

  exec($cmd, $out, $rv);
  
  echo "output is:\n".implode("\n", $out)."\n exit code:$rv\n";

  The output is : "output is : exit code:127"

  The command I'm using is in this format :

  ffmpeg -i "sample.mov" -vcodec libvpx  -r 30 -b "644k" -acodec libvorbis -ab 128000   -ar "44100" -ac 2 -s "352x198" "sample.webm"

  I've tried replacing "ffmpeg" with the full path to FFmpeg but that did not work.

  Why isn't the script running the command correctly and converting the files ?

  Thank you !