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• fluent-ffmpeg concatenate audio files

  8 septembre 2020, par Martin

  I am trying to use fluent-ffmpeg with my electron app to concatenate multiple audio files together with an image in a video. So if i have three files :

  


  song1.mp3 1:00
song2.mp3 0:30
song3.mp3 2:00
front.jpg

  


  I could create output.mp4 which would be 3:30 seconds long, and play each file one after the other in order. With front.jpg set as the background image.

  


  I have succesfully been able to render a single audio file with an image file, but havent been able to render multiple audio files together yet into a video.

  


  Here is my concat attempt :

  


  const command = ffmpeg();
       
            const audioFiles = ['C:\\Users\\marti\\Documents\\martinradio\\uploads\\Movers - 1970 greatest hits vol. 2\\01 back from the moon.mp3', 'C:\\Users\\marti\\Documents\\martinradio\\uploads\\Movers - 1970 greatest hits vol. 2\\02 love me not.mp3'];
            audioFiles.forEach((fileName)=>{
                command.input(fileName);
            })
            command
                    .complexFilter([
                        '[0]adelay=1000|1000[a]',
                        '[1]adelay=4000|4000[b]',
                        '[a][b]amix=2'
                    ])
                    .input(imgPath)
                    .videoCodec('copy')
                    .save('C:\\Users\\marti\\Documents\\martinradio\\uploads\\Movers - 1970 greatest hits vol. 2\\concat-autio.mp4')
                    .on('codecData', function(data) {
                        console.log('codecData=',data);
                    })
                    .on('progress', function({ percent }) {
                        console.log('progress percent: ' + percent);
                    })
                    .on('end', function() {
                        console.log('file has been converted succesfully');
                    })
                    .on('error', function(err) {
                        console.log('an error happened: ' + err.message);
                    })
                    command.run()


  


  When I run it I can see in my console it start, run, and end.

  


  

  


  My example uses two audio files :

  


  01 back from the moon.mp3 02:31
02 love me not.mp3' 02:35

  


  So my output file should be 05:06 in length, but my output is only 02:39 in length


  


• How do I compile a c++ repository with multiple libraries [on hold]

  12 septembre 2017, par Firat Oezcan

  before someone comes and tells me that I should just google stuff first. I did. I didn’t really found anything that suits my needs and also asked my colleagues and other graduates and no one really could help me out.

  It is about this repository specifically : https://github.com/facebook/transform360

  Yes, there are literal instructions on how to do it but they are, honestly, too vague for me. I know that sounds really weird but I guess I’m just spoiled by Unity3D and other IDEs that did most of it for me.

  I don’t understand what is meant with :
  Build .cpp and .h files in Transform360, together with openCV, as a library, where these files are dependent on openCV
  and this line
  Add the Transform360 library file to the extra-libs of ffmpeg.

  I would love if anyone could help me out or better, explain to me how something of this kind is done correctly so I don’t have to ask again. Or really, just point me to information that already exists.
  Thanks in advance

• Using FFMPEG to add pillar bars

  10 février 2021, par Ewok BBQ

  I have transferred some film to video files from 16mm (native 4:3). The image looks great.

  


  When I scanned them, I scanned to a native 16:9. As I overscanned them, I got the entire height of the frame, which is what I want. But it also got the soundtrack and perforation. But I want to go just to the frame line on the sides as well.

  


  I can CROP the image down with FFMPEG to remove the information outside of the framing I want [-vf crop=1330:1080:00:00].
I know this will result in a non-standard aspect ratio.
This plays fine on a computer (vlc just adapts to the non-standard).

  


  But for standardized delivery, I would love to keep the native 1920x1080 pixels, but just make everything outside of the centered 1330:1080 black.

  


  Is there a way to specifically select where the pillar bars are ?

  


  I really want to re-encode the video as little as possible.

  


  In that vein, does anyone have a better tool than -vf crop as well ?

  


  thank you very very much.