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• Shifting audio in MPEG4 content and manipulating atoms

  10 janvier 2018, par LLL

  1. Shift audio

  I use ffmpeg / avconv quite often ... and usually I hate it.
  Those tools do what they are instructed to do about 30% of the time. I could give you countless examples but I don’t want to start flame war, so please help me with my current problem (really easy one).

  I wanted to shift audio (content is standard mp4 file with aac and h264 tracks), so I have found a "highly upvoted" solution :

  https://superuser.com/a/983153/758887

  the only problem with it is that it doesn’t work. I downloaded latest stable ffmpeg (even on windows as in the thread, so it’s version was 3.4.1) and executed command without changing literaly anything :

  ffmpeg.exe -i "movie.mp4" -itsoffset 3.84 -i "movie.mp4" -map 0:v -map 1:a -vcodec copy -acodec copy "movie-audio-delayed.mp4"

  Result was no shift (I expected audio to be 3.84s late).

  2. Remove MPEG4 atoms

  I would be also grateful if you could recommend some tool for removing MPEG4 boxes from content. For examining MPEG4 content I use MP4 Explorer / Codec Visa (limited) on Windows and AtomicParsley on Linux, however they only print atoms and I would like to edit / remove them. For example MP4Box can remove whole moov->track with "-rem" option but what if I would like to remove moov->track->edts only ?

• Documentation #2094 : Déclarer ses objets éditoriaux - pipeline declarer_tables_objets_sql

  17 août 2011, par Eric Lupinacci

  Il existe aussi un fichier Google partagé que j’ai écrit avec Denisb et que Cédric a relu et corrigé : https://spreadsheets.google.com/spreadsheet/ccc?key=0Aq-LDsZ2YhzydDBvMjRSamQ5aWtfNWpKcnFESjQwU3c&hl=fr&authkey=CMmWhpEC

• How to run a ffmpeg command in Powershell and pass variables to it ?

  22 avril 2021, par lucullus

  I would like to run the following command in Powershell :
ffmpeg -i "VIDEO.mp4" -i "AUDIO.m4a" -c copy -map 0:v:0 -map 1:a:0 "OUTPUT VIDEO.mp4"

  


  But I would like to browse for the files. I have tried this :

  


  Add-Type -AssemblyName System.Windows.Forms 

$VideoBrowser = New-Object System.Windows.Forms.OpenFileDialog -Property @{ 
    InitialDirectory = $PSCommandPath
    Filter = 'Video file (*.mp4)|*.mp4|All files (*.*)|*.*'
    Title = 'Choose video file'
}
$null = $VideoBrowser.ShowDialog()
if (!($VideoBrowser.FileName))
{
    return
}

$AudioBrowser = New-Object System.Windows.Forms.OpenFileDialog -Property @{ 
    Filter = 'Video file (*.m4a)|*.m4a|All files (*.*)|*.*'
    Title = 'Choose audio file'
    RestoreDirectory = $true
}
$null = $AudioBrowser.ShowDialog()
if (!($AudioBrowser.FileName))
{
    return
}

$NewVideoBrowser = New-Object System.Windows.Forms.SaveFileDialog -Property @{ 
    Filter = 'Video file (*.mp4)|*.mp4|All files (*.*)|*.*'
    Title = 'Save new video file as'
    RestoreDirectory = $true
}
$null = $NewVideoBrowser.ShowDialog()
if (!($NewVideoBrowser.FileName))
{
    return
}


  


  And all these ways to run the command but all fail :

  


  $ArgumentList = '"{0}" -i "{1}" -c copy -map 0:v:0 -map 1:a:0 "{2}"' -f $VideoBrowser.FileName, $AudioBrowser.FileName, $NewVideoBrowser.FileName;
Start-Process -FilePath ffmpeg.exe -ArgumentList $ArgumentList -Wait -NoNewWindow


  


  OR

  


  $ArgumentList = '"' + $VideoBrowser.FileName + '" -i "' + $AudioBrowser.FileName + '" -c copy -map 0:v:0 -map 1:a:0 "' + $NewVideoBrowser.FileName + '"'
Start-Process -FilePath ffmpeg.exe -ArgumentList $ArgumentList -Wait -NoNewWindow


  


  OR
ffmpeg.exe $VideoBrowser.FileName -i $AudioBrowser.FileName -c copy -map 0:v:0 -map 1:a:0 $NewVideoBrowser.FileName

  


  What should I try ?