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• How to reduce the file size during conversion of video from any video to mp4 using ffmpeg &mp4box in PHPmotion ?

  6 mars 2016, par Balaji Kandasamy

  I am using ffmpeg & mp4box in my PHPmotion site to convert videos to mp4 format. When I convert a 50MB video to mp4, the file size remain same. So Its affecting the video streaming in my site. So I want to reduce the file size of the video in conversion. This is my code example, that I’ve used the site for converting m4v videos in PHPmotion.

  $ffmpeg_cmd2_2 = "$config[path_to_ffmpeg] -i $raw_video_path -vcodec libx264 -vpre veryfast -crf 15 -b 5120000 -threads 0 -acodec libfaac -ac 2 -ab 128k -ar 44100 -f mp4 $new_flv_1";
  
  $mp4box_cmd = "$mp4box_path -add $new_flv_1 $new_flv_2" 

  When I use this command,it converts the m4v file to mp4 format, but the filesize doesn’t change. What command I should use in this to reduce the filesize during video conversion in PHPmotion ? Can anyone write a ffmpeg command to reduce the filesize during conversion ?

• Trim video in Android using ffmpeg, audio and video not in sync

  8 novembre 2017, par Nidhin Radh

  I’m creating an Android application which process video files and I’ve used VideoKit library (https://github.com/inFullMobile/videokit-ffmpeg-android) to integrate ffmpeg with the application.
  I used the following snippet to trim a video,

                      Command command= videoKit.createCommand()
  
                                      .overwriteOutput()
  
                                      .inputPath(ipfile.getAbsolutePath())
  
                                      .outputPath(opfile.getAbsolutePath())
  
                                      .customCommand("-ss 10 -t 30 -vcodec "+ 
  
                                       "copy -acodec copy -async 1")
  
                                      .copyVideoCodec()
  
                                      .experimentalFlag()
  
                                      .build();
  
                              command.execute();

  Sometimes the output seems to be okay, but sometimes the video and audio are not in sync, i.e. video ends before audio. Most of the time this happens with videos downloaded from YouTube.
  Can someone give me an idea to trim videos in android without any problems ?

• ffmpeg play short video during playing another video

  10 mai 2016, par Szymek Świderski

  I want put and play scrap of short video during play another video in ffmpeg. I use this : ffmpeg -i 0.mp4 -i "prawo.mp4" -filter_complex "blend=all_mode='heat':all_opacity=0.3" output.mp4

  and i get this :

  First input link top parameters (size 1280x720, SAR 0:1) do not match the corresponding second input link bottom parameters (1920x1080, SAR 1:1)

  What should i do ? Any help ?