CODEWITHSUNDEEP
audioffmpegconcatenationcodecandroid-ffmpeg
Vivek Thummar
Vivek Thummar

Reputation: 413

Merge Audio Files with different Codecs

i'm working on merging multiple audio merge and i'm using this command

(in below command tempTxtFile is file for all audiopath)

cmd = "-f concat -safe 0 -i " + tempTxtFile + " -c copy -preset ultrafast " + filepath;

well, because i'm using -c copy it only works if selected audios are of codec mp3,but if i will use mp3 and m4a(aac) or both m4a audios,it is preventing me from merge.

So, i now i'm using another command which is as follows(for 2 audios):

cmd = "-f concat -safe 0 -i " + tempTxtFile + " -filter_complex [0:a][1:a]" + "concat=n=2:v=0:a=1[outa] -map [outa] -c:a mp3 -preset ultrafast " + filepath;

This command showing me given error when running

Invalid file index 1 in filtergraph description [0:a][1:a]concat=n=2:v=0:a=1[outa].

This is whole log 

Input #0, concat, from '/storage/emulated/0/Download/tempFile.txt':
  Duration: N/A, start: 0.000000, bitrate: 117 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 117 kb/s
    Metadata:
      handler_name    : SoundHandler
Invalid file index 1 in filtergraph description [0:a][1:a]concat=n=2:v=0:a=1[outa].

Right now i'm not able to do anything and don't know any working solution.

Upvotes: 0

Views: 1186

Answers (1)

Gyan
Gyan

Reputation: 92928

When codecs are different across files, you should feed all inputs individually and then use the concat filter e.g.

ffmpeg -i file1 -i file2 -i file3 -filter_complex concat=n=3:v=0:a=1 -c:a mp3 -vn out.mp3

Upvotes: 2

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