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• How does the moov atom corrupt when editing metadata

  20 juin 2015, par Sam

  I have been editing metadata for some video files that I have, using a program called iDentify (on a mac). This is an old version of the program, made before they charged for it. It generally works perfectly, however about one in a hundred files that it processes, corrupts as it updates the metadata (artwork, description etc). The file is then un-openable.

  If I run the corrupt mp4 file through ffmpeg, I get an error saying that the moov atom could not be found. I have tried to research and I think the moov atom is sort of like a folder within the file, that holds the movie data... But I really am not sure about it. It seems like this is an issue that is normally seen when a camera crashes while filming, before it can make an index for the file. Thats not the case here, the file worked fine before running it through identify.

  What I would like to know is how editing the metadata can corrupt a file like this. Does anyone have any suggestions what the identify application would be doing to a file to corrupt it in this way ? The application is really quick (a couple of seconds), there is no encoding or new files, just inserting metadata.

  I managed to get another copy of the original good file and made a few copies of it. Every time I ran that particular video through identify, it would come out corrupted (but was absolutely fine beforehand). Therefore there must be a characteristic in the file that makes inserting metadata dangerous, causing corruption.

  Can anyone suggest what might be causing this corruption of the moov atom ? And then it might be possible to work out a fix...?

• FFMPEG amix filter volume of different audios at different time is not constant

  5 novembre 2018, par Ahsam Aslam

  I am using FFMPEG in one of my Project I used the command following below to merge audio with video at specific time but as the audio has very slow volume at the begining of the video but starts growing rapidly...

  I tried diffrent solution but none of the worked for me I will be highly grateful if anyone could sort out this

      ffmpeg -i temp_0.mp4 -i user_2123_10.mp4  -i user_2123_3.mp4  -i user_2123_4.mp4  
  
      -i user_2123_7.mp4  -i user_2123_5.mp4  -i user_2123_1.mp4  -i user_2123_8.mp4  
  
      -i user_2123_0.mp4  -i user_2123_6.mp4  -i user_2123_9.mp4  -i user_2123_2.mp4  
  
      -i user_2123_11.mp4 -filter_complex "[1:a]adelay=34741.0[aud1];
  
      [2:a]adelay=18241.0[aud2];[3:a]adelay=20602.0[aud3];
  
      [4:a]adelay=27852.0[aud4];[5:a]adelay=22941.0[aud5];
  
      [6:a]adelay=13142.0[aud6];[7:a]adelay=29810.0[aud7];
  
      [8:a]adelay=12.0[aud8];[9:a]adelay=25692.0[aud9];
  
      [10:a]adelay=32143.002[aud10];[11:a]adelay=16101.0[aud11];
  
      [12:a]adelay=40848.0[aud12];
  
      [0:a][aud1][aud2][aud3][aud4][aud5][aud6][aud7]
  
      [aud8][aud9][aud10][aud11]
  
      [aud12]amix=inputs=13:dropout_transition=0,dynaudnorm=r=0.6" 
  
      -vcodec copy -y temp_1.mp4 

• Why is the stream stream interrupted ?

  5 décembre 2023, par mmrer

  Task : endlessly play video files from the folder to work screens.
I decided to use Ubuntu Server, Nginx+RTMP_MODULE, Ffmpeg.

  


  Ubuntu 22.04.3 LTS Jammy

  


  uname -a
Linux streamserver 5.15.0-89-generic #99-Ubuntu SMP 


  


  /nginx.conf/

  


  worker_process 1;
events {
    worker_connections 1024;
}

# RTMP configuration
rtmp {
    server{
        listen 1935;
        chunk_size 4096;
        
        application live {
            live on;
            record off;
        }
    }
}


  


  /bash.sh/

  


  #!/bin/bash

directory_video="/home/stream_server/VideoStream"
stream="rtmp://localhost/live"

while :
do
    name_video=$(ls $directory_video|sort -R|head -1) #take video name
    
    ffmpeg -re -i $directory_video/$name_video \
    -b:v 3000k                                 \
    -f flv -flvflags no_duration_filesize      \
    rtmp://localhost/live
done


  


  When starting the script bash.sh everything goes well.
The problem arises when the player tries to start the next video.
For some reason, the player launches only the first few frames after which the picture stops on them.

  


  What am I missing ?

  


  I tried to launch FFMPEG separately from the script, changed various speed settings, bitrate, and resolution.

  


  No matter what I do the problem, it is saved as it is.