Recherche avancée

Sur d’autres sites (10846)

• How can I create a process that can be multiplied by a variable number ?

  18 octobre 2019, par Kaden

  A bit hard to explain this one, but I have an ingest of a variable amount of .mp4 files (sometimes it’s 30, other times it’s 10) and I need to have a subproccess.call('code', shell=True) for each of the .mp4 files that are being ingested into that folder. Each file has already been renamed in numeric order (1.mp4, 2.mp4, 3.mp4, etc...) and I can store the number of ingested files into a variable sumlines using the code
  with open(urls.txt", 'r') as file:     sumlines = sum(1 for _ in file)
  So my question is, is there a way I can use the variable sumlines to automatically subproccess call the exact number of files needed ?
  Find a screenshot here

• Can I use FFMPEG to replace $N number of frames while keeping the audio ?

  16 août 2020, par Ian Arman

  Is this possible with ffmpeg or am I required to use another program.

  


  I have a .mp4 file and I want to replace $n number of frames while keeping the audio.

  


  At this point I'm not concerned about transitions such as fading or anything - I'm only wondering if this is possible through the commands.

  


  Thus the output of the file would be {replaced frames - $N number}{remaining video - minus replaced frames}

  


• What is substitute for ffmpeg video filter "between" for audio filter

  18 janvier 2018, par Hekimen

  i want make a short video preview from long video with audio, but i have problem to select audio stream segments on specific timestamps.
  I am using this option for segmenting video

  -filter_complex "[0:v]select='between(t,216,220.5)+between(t,432,436.5)+between(t,648,652.5)+between(t,864,868.5)+between(t,1080,1084.5)+between(t,1296,1300.5)+between(t,1512,1516.5)+between(t,1728,1732.5)+between(t,1944,1948.5)+between(t,2160,2164.5)'[outv]"

  and my question is how this option rewrite for audio stream, because when i use just -filter without selecting any stream then i get error : Cannot connect video filter to audio input

  I am using this ffmpeg version :

  ffmpeg version 3.3.3-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.4.0 (Debian 6.4.0-2) 20170724
  configuration : —enable-gpl —enable-version3 —enable-static —disable-debug —disable-ffplay —disable-indev=sndio —disable-outdev=sndio —cc=gcc-6 —enable-fontconfig —enable-frei0r —e
  nable-gnutls —enable-gray —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopus —enable-librtm
  p —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx264 —enable-libxvid
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100