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• 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 ?

  


• JavaCV FFmpegFrameGrabber & Java2DFrameConverter creating weird looking image

  4 juin 2020, par mega12345mega

  I'm new to JavaCV, so the issue is probably very obvious. I'm trying to do the easy said, difficult done, task of getting the images and audio from a video so I can start making a video editor. After lots of confusion and errors, I am finally getting a result, but it is as odd as the errors. The image appears to be squished in the x direction, with the extra space to the right being transparent (so the image size matches the video's size). Additionally, it has a lot of extra transparent pixels and is multicolored in an odd way.

  



  What the image should look like : https://gofile.io/d/1lQnNd

  



  What the image looks like : https://gofile.io/d/kc09G7

  



  Here is my code :

  



  try {
    FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber("C:/Users/mega12345mega/Desktop/Test Files/video.mp4");
    frameGrabber.setFormat("mp4");
    frameGrabber.start();

    int width = frameGrabber.getImageWidth();
    int height = frameGrabber.getImageHeight();
    System.out.println("width: " + width + ", height: " + height);

    Frame frame = frameGrabber.grabImage();
    if (frame == null)
        throw new Exception("Frame is NULL!");
    if (frame.image == null)
        throw new Exception("Frame Image is NULL!");

    BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
    if (bi == null)
        throw new Exception("bi is NULL!");

    Java2DFrameConverter.copy(frame, bi);
    ImageIO.write(bi, "png", new File("C:/Users/mega12345mega/Desktop/Test Files/img.png"));

    frameGrabber.stop();
    frameGrabber.close();
} catch (Exception e) {
    throw new Exception("Error Getting Image", e);
}


  



  If you are interested, here is the console :

  



  width: 1280, height: 720
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:/Users/mega12345mega/Desktop/Test Files/video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:04.95, start: 0.000000, bitrate: 16375 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 16401 kb/s, 60 fps, 60 tbr, 90k tbn, 120 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  



  Additionally, if I just do frameGrabber.grab() instead of frameGrabber.grabImage() (which I believe leaves out the audio), the frame's image property is null (that is what the frame.image == null statement is there for). I am not sure if that belongs in a new question, but help on that is also appreciated.

  



  Thanks in advance !

  


• ffmpeg replace central channel with ffmpeg

  24 mai 2020, par Rafal B

  I'm trying to replace central channel in the movie (Movie-A) with another audio stream from another movie (Movie-B).
I was able to extract stereo stream from Movie-B :

  



  ffmpeg.exe" -i "Movie-B.mkv"

Stream #0:1(pol): Audio: ac3, 48000 Hz, stereo, fltp, 320 kb/s (default)


  



  and convert it to mono stream :

  



  ffmpeg.exe" -i "Movie-B.mkv" -vn -ab 320k -ac 1 "Movie-B-Audio.ac3"
Output #0, ac3, to 'Movie-B-Audio.ac3':
Stream #0:0(pol): Audio: ac3, 48000 Hz, mono, fltp, 320 kb/s (default)


  



  For Movie-A :

  



  ffmpeg.exe" -i "Movie-B.mkv"
Stream #0:1(eng): Audio: aac (LC), 48000 Hz, 5.1, fltp (default)


  



  so Layout is 5.1 (FL+FR+FC+LFE+BL+BR), not 5.1(side) (FL+FR+FC+SL+SR)

  



  Media Info shows :

  



  Audio
ID: 2
Format: AAC
Format info: Advanced Audio Codec Low Complexity
Commercial name: AAC
Codec ID: A_AAC-2
Bit rate: 426 kb/s
Channel(s): 6 channels
Channel positions: Front: L C R, Side: L R, LFE
Channel layout: C L R Ls Rs LFE


  



  I have extracted all 6 channels into one stream with containing 6 channels :

  



  ffmpeg.exe" -i "Movie-A.mkv" -vn -ab 320k -ac 6 "Movie-A-Audio.ac3"
Output #0, ac3, to 'Movie-A-Audio.ac3':
Stream #0:0(eng): Audio: ac3, 48000 Hz, 5.1, fltp, 320 kb/s (default)


  



  But at this stage I'm getting different Layout in Movie-A-Audio.ac3 :

  



  Audio
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Duration                                 : 2 h 16 min
Bit rate mode                            : Constant
Bit rate                                 : 320 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs


  



  In source Movie-A.mkv it is : Channel layout : C L R Ls Rs LFE

  



  In output Movie-A-Audio.ac3 it is : Channel layout : L R C LFE Ls Rs

  



  Then I tried to extract those 6 channels into separate mono-stream files :

  



  ffmpeg.exe" -i "Movie-A-Audio.ac3" -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR]" -ab 320k -ac 1 -map "[FL]" extr_front_left.ac3 -ab 320k -ac 1 -map "[FR]" extr_front_right.ac3 -ab 320k -ac 1 -map "[FC]" extr_front_center.ac3 -ab 320k -ac 1 -map "[LFE]" extr_subwoofer.ac3 -ab 320k -ac 1 -map "[BL]" extr_back_left.ac3 -ab 320k -ac 1 -map "[BR]" extr_back_right.ac3


  



  With result :

  



  Stream mapping:
  Stream #0:0 (ac3) -> channelsplit
  channelsplit:FL -> Stream #0:0 (ac3)
  channelsplit:FR -> Stream #1:0 (ac3)
  channelsplit:FC -> Stream #2:0 (ac3)
  channelsplit:LFE -> Stream #3:0 (ac3)
  channelsplit:BL -> Stream #4:0 (ac3)
  channelsplit:BR -> Stream #5:0 (ac3)
Press [q] to stop, [?] for help
Output #0, ac3, to 'extr_front_left.ac3':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Audio: ac3, 48000 Hz, mono, fltp, 320 kb/s
    Metadata:
      encoder         : Lavc58.54.100 ac3
Output #1, ac3, to 'extr_front_right.ac3':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #1:0: Audio: ac3, 48000 Hz, mono, fltp, 320 kb/s
    Metadata:
      encoder         : Lavc58.54.100 ac3
Output #2, ac3, to 'extr_front_center.ac3':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #2:0: Audio: ac3, 48000 Hz, mono, fltp, 320 kb/s
    Metadata:
      encoder         : Lavc58.54.100 ac3
Output #3, ac3, to 'extr_subwoofer.ac3':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #3:0: Audio: ac3, 48000 Hz, mono, fltp, 320 kb/s
    Metadata:
      encoder         : Lavc58.54.100 ac3
Output #4, ac3, to 'extr_back_left.ac3':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #4:0: Audio: ac3, 48000 Hz, mono, fltp, 320 kb/s
    Metadata:
      encoder         : Lavc58.54.100 ac3
Output #5, ac3, to 'extr_back_right.ac3':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #5:0: Audio: ac3, 48000 Hz, mono, fltp, 320 kb/s
    Metadata:
      encoder         : Lavc58.54.100 ac3


  



  When I'm checking channels layouts of those files extracted I see each of them is having Channel Layout marked with Central, for instant front_left.ac3 :

  



  Audio
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Duration                                 : 2 h 16 min
Bit rate mode                            : Constant
Bit rate                                 : 320 kb/s
Channel(s)                               : 1 channel
Channel layout                           : C
Sampling rate                            : 48.0 kHz


  



  Then I try to join needed channels :

  



  ffmpeg.exe" -i extr_front_left.ac3 -i extr_front_right.ac3 -i Movie-B-Audio.ac3 -i extr_back_left.ac3 -i extr_back_right.ac3 -i extr_subwoofer.ac3 -filter_complex "[0:a][1:a][2:a][3:a][4:a][5:a]join=inputs=6:channel_layout=5.1[a]" -map "[a]" "final-output.ac3


  



  But it is completely messed up : central channel (voice) is heard in front right speaker, in back right speaker is silence (or maybe it is subwoofer ?)

  



  Target is easy :

  



  

  1. convert source stereo central audio channel in Movie-B.mkv to mono channel
and

  


  2. insert it as central channel into Movie-A.mkv that have 5.1 Audio stream with layout C L R Ls Rs LFE

  


  



  So far I was able to complete 1. but I have a problem with mappings.
Can someone try to guide me how to do that ?