32

I want to concatenate multiple WAV files into a single WAV file using FFMPEG.

I have used the following command and it generates the required file.

Command:

ffmpeg -f concat -i mylist.txt -c copy output.wav

File :

#mylist.txt
file '1.wav'
file '2.wav'
file '3.wav'
file '4.wav'

But as you can see the problem is that I have to create a text file to specify the list of WAV files to concatenate.

I can do all these tasks, but I would prefer a single command something that looks like

ffmpeg -i 1.wav -i 2.wav -i 3.wav -i 4.wav output.wav 

or

ffmpeg -i "concat:1.wav|2.wav|3.wav|4.wav" -c copy output.wav

I have tried these two simple commands but they return just the voice of 1.wav Please help me write a single command( or correct the above 2 commands ) that achieves the desired result.

Please don't suggest other Media Encoders/Editors, I want to use FFMPEG only, as it is already installed and used at other places.

migrated from stackoverflow.com Apr 25 '13 at 10:34

This question came from our site for professional and enthusiast programmers.

34

You could try using the concat filter; it requires re-encoding, and so will take more system resources (a pretty tiny amount on any vaguely modern computer in this particular case), but PCM -> PCM audio should be mathematically lossless. In your case, you would use something like:

ffmpeg -i input1.wav -i input2.wav -i input3.wav -i input4.wav \
-filter_complex '[0:0][1:0][2:0][3:0]concat=n=4:v=0:a=1[out]' \
-map '[out]' output.wav

If you have five input files, use n=5.

  • 4
    Note: Don't customize [0:0][1:0][2:0][3:0] to match the number of files. Use that exactly as it says. The only thing you should change is the input files and n=4. – Keavon Mar 7 '15 at 22:40
  • 7
    @Keavon: are you sure? Here ffmpeg (version N-49352-gc46943e x64) complains Too many inputs specified for the "concat" filter. when I try to process only 2 inputs with the original code. It works though when I remove [2:0][3:0]... which makes sense to me since in this case there are no such things as streams 2:0 and 3:0... – Bigue Nique Apr 22 '16 at 19:03
  • I agree with @BigueNique. I too ran into the same error and though it feels a little silly, wrote some code to generate the proper sequence given n. – Ryan DuVal May 12 at 18:54
16

I think the best option is to use sox, not ffmpeg:

$ sox short1.wav short2.wav short3.wav long.wav

Solution comes from How do I append a bunch of .wav files while retaining (not-zero-padded) numeric ordering?

  • 1
    This may work for .wav, but sox does not seem to support .mp3. – Aaron Franke Mar 7 '18 at 19:46
  • 1
    Question was precisely about .wav – Héctor M. Monacci Mar 16 '18 at 7:13
  • 1
    I know, I'm just adding a note for anyone who tries to use this method with non-wav files. – Aaron Franke Mar 16 '18 at 7:20
  • the question explicitly stated that a solution is required using ffmpeg only! – Manu Apr 3 '18 at 8:00
  • sox can support .mp3 files too – Benjamin May 28 '18 at 18:55
9

The FFmpeg wiki mentions using the concat protocol is not possible with all file types. It works fine with most MPEG containers and bitstreams, but obviously not WAV files with PCM audio.

You don't necessarily have to create a temporary file and use that. With Bash (or other shells that support process substitution), you can do everything in a single command:

ffmpeg -f concat -i <( for f in *.wav; do echo "file '$(pwd)/$f'"; done ) output.wav

The process substitution <( ) creates a file—or, to be precise, a file descriptor—on the fly, which ffmpeg can read. This file will contain the path to every .wav file in the current directory. We have to prefix it with $(pwd) to get the correct path relative to your current directory, and not relative to the file descriptor.

Of course, the command within the substitution can be changed to something else.

3

Another option is to use concat

ffmpeg -i "concat:file1.mp3|file2.mp3|file3.mp3" -acodec copy out.mp3

  • 1
    Welcome to superuser: While this may or may not answer the question,(an answer has been accepted) it would be a better answer if you could provide some explanation why your solution works with detail and an easy to follow instructions. If you feel your answer is correct do these things and re-edit. Please take a couple of minutes and read:- superuser.com/help .Answering: superuser.com/help/how-to-answer, again welcome to superuser.Thankyou – mic84 Mar 24 '18 at 7:34
  • I tested this and it does not appear to work – Nick Long Aug 7 at 13:56
1

In Win8's Cmd.EXE .BAT script:

Rem Get number of source files
For /F %%A In ('Dir *.3gp /B /A-D ^| Find /C /V ""') Do      Set FilCnt=%%A

Rem Build list of source filenames
Set Lst=
For    %%A In (     *.3gp                          ) Do Call Set Lst=%%Lst%% -i %%A

Rem Concat and Convert sources to target
FFMPeg.EXE %Lst% -filter_complex concat=n=%FilCnt%:v=0:a=1 -vn Output.OGG

This way, you don't bother with the source file names or the concat-count parameter.

-1

You could use shntool for wav-files.

shnjoin -r none 01.wav 02.wav ...

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