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• Can not hear audio when concatenate some mp4 files using FFMPEG [duplicate]

  16 février 2019, par Pimager

  This question already has an answer here :

  • How to add a new audio (not mixing) into a video using ffmpeg ?
    
    6 answers
    

  I need to concatenate some MP4 files. Only one of them has audio. The other ones hasn’t.

  MyList.txt contains :
  file1.mp4 without audio and 5s length
  File2.mp4 without audio and 5s length
  File3.mp4 without audio and 5s length
  File4.mp4 with audio and Ns length

  I need an output that cotains the 4 mp4 files and when file4.mp4 starts I want to hear its audio.

  If I set the file4.mp4 as the first video to concat, the output video has audio, but If I set the file4.mp4 in another position, the output video hasn’t audio.

  What I’m doing wrong ? What I have to modify in my code ?

  ffmpeg -f concat -safe 0 -i myList.txt -c:v copy -c:a copy output.mp4

• Ffmpeg split video file to few video files (with fixed duration) with playlist

  13 septembre 2020, par Kiril Mytsykov

  I need to split video file by duration (for example, if I have video file with duration of 30sec and I want to get 10 chunks : 3sec, 3sec etc.. and m3u8 playlist).

  


  I have my-video.mp4 (30 sec).
When I run this command :

  


  ffmpeg -i my-video.mp4 -c:v libx264 -c copy -an -map 0 -muxdelay 0 -muxpreload 0 -output_ts_offset 0 -f segment -segment_time 3 -segment_wrap 1000 -segment_list_size 1 -segment_list my-video.m3u8 -segment_list_flags +live my-video-%03d.mp4


  


  The first problem is :
I receive only 4 mp4 files :

  


  my-video-000.mp4 (8sec)
my-video-001.mp4 (8sec)
my-video-002.mp4 (8sec)
my-video-003.mp4 (5sec)


  


  The second problem is :
my-video.m3u8 playlist is created, but with last segment only :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:3
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:6
#EXTINF:5.033333,
my-video-003.ts 
#EXT-X-ENDLIST


  


  What's wrong with my command. I have tried a lot of different combinations (after reading http://ffmpeg.org/ffmpeg-formats.html#segment_002c-stream_005fsegment_002c-ssegment and similar questions/answers on stackoverflow, but didn't succeed)

  


• LoaderLock error in videoreader [duplicate]

  22 août 2016, par Naseer Ahmed

  This question already has an answer here :

  • Loader lock error
    
    7 answers
    

  I am getting Following Error

  

  Following is my code

  private void btnVideoBrowse_Click(object sender, EventArgs e)
  
      {
  
          string videoPath = @"******\video.mp4";
  
          VideoFileReader reader = new VideoFileReader();
  
          reader.Open(videoPath);
  
          Bitmap videoFrame = reader.ReadVideoFrame();
  
          pcBoxImage.Image = videoFrame;
  
          videoFrame.Dispose();
  
          reader.Close();
  
      }

  Update

  So I tried to use another method

  VideoFileSource video = new VideoFileSource(@"******\video.mp4");

  But I got the same error.