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• ffmpeg video freezes some seconds the output video

  7 septembre 2022, par FreddicMatters

  I'm using the program ffmpeg on windows, I just downloaded the binaries setted the path variable of windows to be able of use it.

  


  I'm ran ffmpeg with python and also just running the command in the cmd

  


  #videos.txt

  


  file C:/Users/freddydev/Videos/video1.mp4
file C:/Users/freddydev/Videos/video2.mp4
file C:/Users/freddydev/Videos/video3.mp4
file C:/Users/freddydev/Videos/video4.mp4


  


  #python script :

  


  import subprocess
import shlex

subprocess.run(shlex.split('ffmpeg -f concat -safe 0  -i videos.txt -c:v libx264 -c copy output.mp4'))


  


  #cmd

  


  ffmpeg -f concat -safe 0  -i videos.txt -c:v libx264 -c copy output.mp4


  


  The output video plays fine the half of the video and after some 5 seconds it freezes and the final seconds of the video there is not sound.

  


  I have downloaded multiple ffmpeg binaries from https://ottverse.com/ffmpeg-builds and I'm getting the same result.

  


  My laptop is a core i5 with 12GB of RAM.
The rendering is very fast only takes 2 seconds, I also used moviepy library with python and it takes more than 20sg to render the video but when I concatenate large videos this give me wrong frames in the video at the end.

  


  What could I do to fix this problem with ffmpeg.
Thanks so much.

  


• trying to merge audio with video

  9 juillet 2019, par vikram

  i am using ffmpeg for merging audio and video. i have download 4 sec 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.

    this command for silent audio works but cut video
  
  
  
  
  
  
  
    String mergecmd1[]={"-i",output,"-f", "lavfi" ,"-i", "aevalsrc=0", " - 
  
    shortest", "-y", output};     
  
  
  
     this command for mp3 audio but not working 
  
  
  
     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

• Picture-in-Picture overlay skips forward in time when input video orientation changes [closed]

  28 octobre 2024, par Macster

  On my website I can record and stream a video to my server using javascript.
The video is then encoding in realtime using FFMPEG. Additionally there is a second video injected as picture-in-picture.

  


  For some reason, when using a mobile phone for recording and the phone is rotated into landscape mode, the picture-in-picture video will jump forward in time. It's always about half the time that had already passed. This happens on each orientation change.

  


  The video file for the picture-in-picture is not edited by code at any time, so I assume this has to be a FFMPEG thing.

  


  

  


  FFMPEG Command

  


  ffmpeg 
-re 
-i strm.webm 
-i source.webm 
-filter_complex "[0:v]scale=640:480:force_original_aspect_ratio=decreasepad=640:480:-1:-1:color=black[main];[1]scale=iw/1.5:-1setpts=PTS-STARTPTS,format=yuva420p[ovrl]; [main][ovrl]overlay=W-w-10:10[v]; [0:a][1:a]amerge[a]" 
-r 24 
-deadline realtime 
-crf 22 
-cpu-used 15 
-level 2.0 
-map "[v]" 
-map "[a]" 
-c:a aac 
-c:v libvpx 
-pix_fmt nv12 
-threads 4 
-strict -2 
-auto-alt-ref 0 
-b:v:1 1800k 
-s:v:1 1280x720 
-b:v:0 300k 
-s:v:0 640x480 
-bf 1 
-keyint_min 48 
-g 48 
-sc_threshold 1 
-b_strategy 0 
-ar:a:1 96000 
-scenario livestreaming 
-look_ahead 0 
-seg_duration 2 
-remove_at_exit 1 
-streaming 1 
-window_size 30 
-adaptation_sets "id=0,streams=v id=1,streams=a" 
-utc_timing_url https://time.akamai.com/?iso 
-live 1 
-y 
-f dash 
manifest.mpd