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• How to run .mp4 videos on firefox

  19 novembre 2015, par Haseeb Ahmad

  When play mp4 videos on chrome it works fine.But same videos not playing on firefox. After some search I found this

  Firefox does not support .mp4 playback. Try conveting the video to .ogg format which is fast becoming a standard format for html 5 applications.

  Now how I convert this to ogg for firefox.
  My model code is

  has_attached_file :videod, :styles => { 
  
    :medium => { :geometry => "640x480", :format => 'mp4' },
  
    :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
  
  }, :processors => [:ffmpeg]
  
  validates_attachment_size :videod, :less_than => 100.megabytes
  
      validates_attachment_presence :videod
  
      validates_attachment_content_type :videod, :content_type => /\Avideo\/.*\Z/

• FFMPEG 4 videos merge in one screen [duplicate]

  10 août 2018, par Farukh Zahoor

  This question already has an answer here :

  • Vertically or horizontally stack several videos using ffmpeg ?
    
    2 answers
    

  I found a sample that merge 2 videos on one screen

  ffmpeg.exe -i 1.mp4 -i 2.mp4 -filter_complex "[0:v]scale=iw/2:ih/2,pad=2*iw:ih[left];[1:v]scale=iw/2:ih/2[right];[left][right]overlay=main_w/2:0[out]" -map [out] -map 0:a? -map 1:a? -b:v 768k output.mp4

  I tried this command to merge 4 videos on one screen

  ffmpeg.exe -i 1.mp4 -i 2.mp4 -i 3.mp4 -i 4.mp4 -filter_complex "[0:v]scale=iw/2:ih/2,pad=2*iw:ih[upperleft];[1:v]scale=iw/2:ih/2[upperright];[2:v]scale=iw/2:ih/2,pad=2*iw:ih[lowerleft];[3:v]scale=iw/2:ih/2[lowerright];[upperleft][upperright]overlay=main_w/2:0;[lowerleft][lowerright]overlay=main_w/2:0[out]" -map [out] -map 0:a? -map 1:a? -b:v 768k output.mp4

  But this generates output similar to 1st command having 2 videos merged in one view. I need all 4 videos to be shown on one screen. Additionally I want audio of 1st video file should be used for output. Please guide

  The suggested duplicate link and examples merge videos with exact same quality and takes lot of time to generate output file. I want dimension of video should be changed to half and should quickly generate the output file. The example I shared working fine for 2 videos but not for 4 videos.

• Splitting multiple videos into shorter ones at once

  6 juin 2022, par detach429

  I am trying to split my videos into multiple shorter ones, I've managed to make it work for one video, code is given below, but I have multiple videos saved in a folder and I want the code to go through all of them at once, so I don't have to manually change paths for every video, can anyone help ?

  


  required_video_file = 'Videos/Logitech/LogiCapture/1_stresni.mp4'

with open("times.txt") as f:
  times = f.readlines()

times = [x.strip() for x in times] 

for time in times:
  starttime = int(time.split('-')[0])
  endtime = int(time.split("-")[1])
  ffmpeg_extract_subclip(required_video_file, starttime, endtime, targetname=str(times.index(time)+1)+".mp4")```