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• Android ffmpeg - 3gp to mp4(or avi) videos - not playing

  18 juillet 2013, par santhosh

  I am doing an android application which is used to merge two videos and after merge completed play the result video. For this I am using ffmpeg.

  When I record two mpeg or mp4 videos, the result merged video playing fine. Now I record the videos as 3gp and convert it into mp4(or avi) and merged it. Then the result video is not playing.

  Can anybody help me What may be the problem ?

  I am using the following code :

  String args[] = {"ffmpeg","-i",""+filename[i]+"",
  
                              "-qscale","1",
  
                              ""+Environment.getExternalStorageDirectory().getPath()+"/Movies/i"+(i + 1)+".mp4(or avi)"};

  To merge the videos :

  String args[] = {"ffmpeg","-i","concat:"+concatPath.toString()+"",
  
                                "-vcodec", "copy" ,
  
                                "-acodec" ,"copy",
  
                                "-vbsf", "aac_adtstoasc",
  
                                ""+Environment.getExternalStorageDirectory().getPath()+"/Movies/3.mp4"};

• 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.