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• Trying to merge audio with video using ffmpeg

  9 juillet 2019, par vikram

  I am using ffmpeg for merging audio and video. I download a 4 second long MP3 file trying to merge but not successful. i am also trying to merge silent audio. It works but the video become half of its original length. The following command works for silent audio but cuts the video :

  String mergecmd1[]={"-i",output,"-f", "lavfi" ,"-i", "aevalsrc=0", " - 
  
  shortest", "-y", output};     

  This is the command I have used for MP3 audio but it does not work :

     String cmd1[]={"-i", output ,"- 
  
     i","/storage/emulated/0/FestiveApp/Assets/audio.mp3" ,"-codec", "copy", 
  
     "-shortest", output};
  
  
  
           ffmpeg = FFmpeg.getInstance(Donts_Activity.this);
  
      try {
  
  
  
          ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {

  // Log.e("ffmpeg","Exaction Start") ;
  }

              @Override
  
              public void onProgress(String message) {}
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  progressDialog.dismiss();
  
                  Log.e("ok",message);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  new Sessionmanager(Donts_Activity.this).SetImageToVideoPath(output);
  
  
  
                  Log.e("ok","success");
  
  
  
  
  
                  progressDialog.dismiss();
  
  
  
                  Intent intent=new Intent(Donts_Activity.this,MediaRecorderRecipe.class);
  
                  startActivity(intent);
  
                  finish();
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
  
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          Log.e("ffmpeg",e.toString());
  
          progressDialog.dismiss();
  
      }

  My first goal generate video with audio but video length does not be reduce or cut if i am using mp3 or silent ffmpeg audio command

• drawtext video transition is not smooth

  7 juin 2020, par Sterpu Mihai

  Edit : it seems that youtube displays the 00:05 transition smoothly ; however, my local VLC doesn't so I think this must be a VLC issue of some kind.

  



  Take a look at this video : https://youtu.be/47JJnrH_LyM

  



  It's created from a bigger video and it's composed of 3 parts :

  



  part 1: 00:00 - 00:05 original.mp4
part 2: 00:05 - 00:10 original_with_caption.mp4
part 3: 00:10 - 00:15 original.mp4


  



  The caption snippet was created using the following command :

  



  ffmpeg -ss 00:05 -t 5 -i original.MP4 -vf drawtext="fontfile=C\\:/Windows/Fonts/arial.ttf:fontsize=100:fontcolor=white:x=(w-text_w)/2:y=(h-th-100):text='some random text here'" original_with_caption.MP4


  



  The cuts from the original video were made with the following commands :

  



  ffmpeg -y -i D:\temp\0706\caption\original.MP4 -ss 0 -t 5 -c copy D:\temp\0706\caption\ws\original_split_0_5.MP4
ffmpeg -y -i D:\temp\0706\caption\original.MP4 -ss 10 -t 5 -c copy D:\temp\0706\caption\ws\original_split_10_15.MP4


  



  Finally, all 3 have been merged together by creating a concat.txt file containing the following :

  



  file D:\\temp\\0706\\caption\\ws\\original_split_0_5.MP4
file D:\\temp\\0706\\caption\\original_with_caption.MP4
file D:\\temp\\0706\\caption\\ws\\original_split_10_15.MP4


  



  and then executing the command :

  



  ffmpeg -f concat -safe 0 -i D:\temp\0706\caption\ws\concat.txt -c copy D:\temp\0706\caption\ws\output.MP4


  



  The problem I'm facing is that the transition from 00:05 is not smooth whereas the one from 00:10 is.
What do I need to adapt so the transition is smooth ?

  


• A 'clean' way to cut an MP4 movie into two sections using FFMPEG ?

  30 août 2020, par Peter in Japan

  I am attempting to use FFMPEG to make a script that can easily split a short MP4 movie with sound into two pieces at a certain point. I've searched through what feels like hundreds of posts to try to find "the" answer, but most of my attempts end up with poor results, broken video files that cause my video play to freeze, and so on. I am attempting to make a script that allows me to easily cut a short anime movie (something grabbed from Twitter or some other short source) and cut it into two sections, so it can be under the 2:20 Twitter time limit, or to cut out some scene I don't want to show my followers.

  


  The issue is that FFMPEG is good at cutting videos into segments, but bad at know where keyframes are, so most videos have two seconds of blank video at the front before some keyframe appears, which looks terrible.

  


  One example I found that works well is below, which cuts any mp4 into a bunch of chunks of n second size (six seconds in the example below). Source and documentation for this is https://moe.vg/3b8eNTs

  


  ffmpeg -i seitokai.mp4 -c:v libx264 -crf 22 -map 0 -segment_time 6 -reset_timestamps 1 -g 30 -sc_threshold 0 -force_key_frames "expr:gte(t,n_forced*1)" -f segment output%03d.mp4

  


  This code works great, at least allowing me to access the "left" side of a video that I want, in this case a six-second segment I want. Can anyone tell me how to accomplish the above, but starting at the 13-second period in said video, so I could get right "right" (not starting from 00:00:00) video cut cleanly ?

  


  Alternately, a single, unified and elegant way to split (re-encode) an MP4 into two segments that forces keyframes from the very beginning of the cut pieces would be wonderful. I can't believe how hard this seems to be.

  


  Thanks in advance for any help you can give ! Greetings from rural Japan !