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• How to capture screenshots from a video clip 50 minutes into the clip and do it fast ?

  3 janvier 2015, par Mint

  Ok it seems that whenever I tell ffmpeg to take a screen cap half way though the clip (clip can be as long as 10 hours) it uses 100% of 1 cpu core and takes ages… whereas if I let it do a frame at the start it goes real quick, as if it scans though the video to get to the middle instead of just jumping to it !

  Here is the code im currently using :

  ffmpeg -y -itsoffset -“500"  -i “clipname.mov" -vcodec png -vframes 1 -an -f rawvideo “clipScreenshot001.png”

  This can take several minutes.

  These are HD videos too, 720p/1080p and allot of the time they are raw unedited clips (e.g. very long).

  So I was hoping for some better software that will make screen captures from video much faster (has to be linux and scriptable).

• FFMPEG change videos size

  16 juillet 2022, par Rittari771

  How do i change a video that is 1920x1080 to 1080x1920, and then "shrink" it so that it fills only half of the 1080x1920 screen size ?
here is what i mean :

  


  1920x1080 original

  


  needs to be changed to

  


  1080x1920 that covers 50% of screen space only

  


• MoviePy Is Able To Print Video Duration But When Performing Edit It Cannot Find Duration ? | Python

  10 avril 2021, par PythonProgrammer

  I have been troubled by this issue when I am making a video downloader.
The Code Below :

  


      videoclip = VideoFileClip(fr'{directory}\audio\{yt.title}.mp4')

    duration = videoclip.duration

    print(duration)

    audioclip = videoclip.audio
    audioclip.write_audiofile(fr"{directory}\{yt.title}.mp3")
    audioclip.close()
    videoclip.close()


  


  Output :

  


  145
MoviePy error: failed to read the duration of file C:\Users\achut\Desktop\Movies\audio\Winning With Half A Heart | Minecraft Skywars.mp4.
Here are the file infos returned by ffmpeg:

ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
C:\Users\achut\Desktop\Movies\audio\Winning With Half A Heart | Minecraft Skywars.mp4: Invalid argument


  


  For some odd reason it is able to print the video duration but apparently cannot find it when I am trying to save the audio from the video as a separate file.

  


  Thanks for the help ! I am using latest version of moviepy and its dependencies, I just installed it today.