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• Concatenate audio files using ffmpeg

  4 juin 2021, par user13962029

  I am trying to concatenate ac3 and aac using ffmpeg.

  


  ffprobe of jpn_op.m4a :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'jpn_op.m4a':
Metadata:
major_brand     : M4A 
minor_version   : 512
compatible_brands: M4A isomiso2
encoder         : Lavf58.76.100
Duration: 00:01:17.28, start: 0.000000, bitrate: 224 kb/s
Stream #0:0(jpn): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 224 kb/s (default)
Metadata:
  handler_name    : SoundHandler
  vendor_id       : [0][0][0][0]
Side data:
  audio service type: main


  


  ffprobe of eng_nop.m4a

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'eng_nop.m4a':
Metadata:
major_brand     : M4A 
minor_version   : 512
compatible_brands: M4A isomiso2
encoder         : Lavf58.76.100
Duration: 00:22:09.26, start: 0.023000, bitrate: 41 kb/s
Stream #0:0(und): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 39 kb/s (default)
Metadata:
  handler_name    : SoundHandler
  vendor_id       : [0][0][0][0]


  


  I tried this :

  


  ffmpeg -f concat -i concat_files.txt -c copy final.m4a -y


  


  concat_files.txt contains :

  


  file 'jpn_op.m4a'
file 'eng_nop.m4a'


  


  ffprobe of final.m4a

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'final.m4a':
Metadata:
major_brand     : M4A 
minor_version   : 512
compatible_brands: M4A isomiso2
encoder         : Lavf58.76.100
Duration: 00:23:26.50, start: 0.000000, bitrate: 51 kb/s
Stream #0:0(jpn): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 224 kb/s (default)
Metadata:
  handler_name    : SoundHandler
  vendor_id       : [0][0][0][0]
Side data:
  audio service type: main


  


  But, there is silent in place of 2nd file in final.m4a

  


• Trim Audio Flutter ( ffmpeg_kit_flutter Package) Not Working

  23 septembre 2024, par Sharath Appesh

  Audio Trim is not working

  


  Flutter Version : 3.0.2
Dart : 2.17.3

  


  Package used :
ffmpeg_kit_flutter : ^4.5.1

  


  Input file path :
"/data/user/0/com.goonetech.v1.gofinal/cache/file_picker/sample-15s.mp3"

  


  Output file path :
"/data/user/0/com.goonetech.v1.gofinal/app_flutter/output.mp3"

  


  &#xA;double start=2, &#xA;double end=5;&#xA;&#xA;String path="/data/user/0/com.goonetech.v1.gofinal/cache/file_picker/sample-15s.mp3"&#xA;&#xA;&#xA;    static Future<string> cutAudio(String path, double start, double end) async {&#xA;    final Directory dir = await getApplicationDocumentsDirectory();&#xA;    final outPath = "${dir.path}/output.mp3";&#xA;    double start = 1;&#xA;    double end = 5;&#xA;&#xA;    try &#xA;{&#xA;      await File(outPath).delete();&#xA;    } catch (e) {&#xA;      print("Delete Error");&#xA;    }&#xA;&#xA;    var cmd =&#xA;        "-y -i \"$path\" -vn -ss $start -to $end -ar 16k -ac 2 -b:a 96k -acodec libmp3lame $outPath";&#xA;&#xA;    FFmpegKit.executeAsync(cmd, (session) async {&#xA;      final returnCode = await session.getReturnCode();&#xA;      print("returnCode $returnCode");&#xA;    });&#xA;&#xA;    return outPath;&#xA;  }&#xA;&#xA;</string>

  


  The output is :
returnCode 1

  


  The output path does not have the file (File not found exception)

  


• How to merge two videos from Firebase Database and local file ? [closed]

  2 avril 2020, par i i

  I need to merge two videos from a local file and Firebase Storage. How can I solve it ?
I can get the file from a local file but I couldn't get the video from Firebase Storage.

  



  Part of my code :

  



  if(secondlength >0){
        if (secondlength > secondinterval) {
            final File source = new File(files.get(1));
            //  String filename = "https://firebasestorage.googleapis.com/v0/b/***.appspot.com/o/video_covers%2Fvideo_ornek.mp4?alt=media&token=10c3fa8a-4510-4984-8247-8036fffe18b3";
            //  filesname.add(filename);
            //  final File output = new File(Uri.parse(filename).getPath());
            String filename = String.format(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + System.currentTimeMillis() + ".mp4");
            filesname.add(filename);
            final File output = new File(filename);
            startTrim(source, output, startsecond, startsecond + secondinterval);
            startsecond = startsecond + secondinterval + .7;
            secondlength = secondlength - secondinterval;
            Log.e("filename2 in 10", "" + filename);
        } else {
            final File source = new File(files.get(1));
            String filename = String.format(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + System.currentTimeMillis() + ".mp4");
            filesname.add(filename);
            final File output = new File(filename);
            String DownloadUrl = "https://firebasestorage.googleapis.com/v0/b/*****.appspot.com/o/video_covers%2Fvideo_ornek.mp4?alt=media&token=10c3fa8a-4510-4984-8247-8036fffe18b3";
            DownloadManager.Request request1 = new DownloadManager.Request(Uri.parse(DownloadUrl));
            request1.setDescription("Sample Music File");   //appears the same in Notification bar while downloading
            request1.setTitle("File1.mp3");
            request1.setVisibleInDownloadsUi(false);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                request1.allowScanningByMediaScanner();
                request1.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
            }
            request1.setDestinationInExternalFilesDir(getApplicationContext(), "/File", "Question1.mp4");

            DownloadManager manager1 = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
            Objects.requireNonNull(manager1).enqueue(request1);
            if (DownloadManager.STATUS_SUCCESSFUL == 8) {
                Toast.makeText(AllVideoMerge.this, "success", Toast.LENGTH_SHORT).show();
            }

            startTrim(source, output, startsecond, startsecond + secondlength);
            startsecond = 0;
            secondlength = 0;


            Log.e("filename2", "" + filename);
        }
    }