Recherche avancée

Sur d’autres sites (11881)

• Issues in python based ffmpeg operation

  28 septembre 2021, par Adideva98

  I am trying to write a script that would automatically take duration values and chop an audio file into smaller splits. To do this I have saved all my start times and durations in a list. And this is the code I am trying to run.

  


  for k in range(0,len(start_time)):
  s=start_time[k]
  e=Duration[k]
  filename = "output%d.mp3" % (k)
  !ffmpeg -i Audio.mp3 -ss s -t e -acodec copy filename
  k=k+1


  


  On running this I get the following error
Invalid duration specification for ss: s
I suspect that this error arises because of the fact that since I am using lists to call elements, the time stamp comes with quotes on both sides. Secondly, I am not sure how to specify the filename, such that each created split has the name of this format Output_1.mp3 and so on. The integer will be an identifier of the split. What could be possible fixes for this piece of code ? Please note that I am running this on Google Colab.

  


• FFMPEG changing output framerate issues

  12 septembre 2022, par is_this_taken

  I want to take the input, blend N frames, decimate the other frames and use those for the output with the fps of my choice.

  


  I used this line :

  


  ffmpeg -y -i input.mp4 -vf tmix=frames=15:weights="1",select='not(mod(n\,15))'  -vsync vfr frames/output-%05d.tif


  


  That generated images, which I combined into the video. So far, so good.
But I'd like to skip the image output and go straight to video, so I tried this :

  


  ffmpeg -y -i input.mp4 -vf tmix=frames=15:weights="1",select='not(mod(n\,15))'  -vsync vfr -r 30 -c:v prores_ks -profile:v 3 -vendor apl0 -bits_per_mb 8000 -pix_fmt yuv422p10le output.mov


  


  That produces 1.62 fps video, instead of 30 fps.

  


  I'm at a loss on how to get it to output 30fps without the intermediate step of outputting images.

  


  Thanks

  


• Issues in building ffmpeg on windows

  18 janvier 2024, par RKum

  I have to use ffmpeg in our c++ on windows project. I have visual studio 2017.
For this I have to use ffmpeg-cpp( https://github.com/Raveler/ffmpeg-cpp ).
ffmpeg-cpp is dependent on ffmpeg( https://ffmpeg.org/download.html ).

  


  To build ffmpeg I am following instructions in https://ffmpeg.org/platform.html#Windows.
I installed "MSYS2 MINGW64" using installer msys2-x86_64-20240113.exe.

  


  But I am not seeing files like msys_shell.bat or mingw64_shell.bat or mingw32_shell.bat.

  


  How do I get these file ?

  


  Also if I run commands like "pacman -S make pkgconf diffutils" I get error

  


  error: failed retrieving file 'pkgconf-2.1.0-1-x86_64.pkg.tar.zst' from mirror.iscas.ac.cn : SSL certificate problem: self-signed certificate in certificate chain


  


  How to resolve this certificate issue ?