How to change audio tempo and pitch individuality using ffmpeg?

Question

I have managed to play audio files using ffmpeg and AudioTrack class in my android project. I can change the speed of audio using AudioTrack class setRate method. But it also change the pitch of audio, I want to change only Tempo of audio but I found no solution on net.

anyone can please help me on this as there is no support for this.

score 15 · Answer 1 · answered Apr 15 '14 at 16:16

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You can use the atempo filter in ffmpeg 1.0 and later:

ffmpeg -i input.wav -f:a atempo=1.25 output.wav

atempo only accepts values between 0.5 and 2.0, but you can bypass the limitation by chaining multiple filters:

ffmpeg -i input.wav -f:a atempo=2,atempo=1.5 output.wav

answered Apr 15 '14 at 16:16

Lri

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But using this shortens the original duration of audio. What if I want to keep the original duration along with the modified pitch? – Vikrant_Dev Jan 14 '16 at 06:09
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On windows with version N-77870 at least it appears you need to spell out the word filter as in `ffmpeg -i input.wav -filter:a atempo=1.25 output.wav` – User Feb 09 '16 at 00:31
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Or `ffmpeg -i input.wav -af atempo=1.25 output.wav` – Shovalt Sep 03 '18 at 11:37
ffmpeg -i input.wav -af atempo=1.0827 output.wav – ariane26 Aug 30 '20 at 10:20

score 8 · Accepted Answer · answered Jul 16 '12 at 13:05

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Solution : I tried SoundTouch library. I compiled it successfully for android but then I failed to use its function because I don't know how to use this library to load audio.

But after that I tried library called Sonic. Its basically for Speech as it use PSOLA algo to change pitch and tempo. But its ok.

answered Jul 16 '12 at 13:05

Vipul Purohit

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Hi vipul . I am trying to concatenate and change tempo of mp3 files in my android app. As i am new to android I dont know how to use library Sonic that you suggested above. As the work you have done with audio files , I hope that you have solution for my problem. If you can help me out in changing tempo , that will be a great help. And if you have answer I can post a question for it. Thank you Vipul – Harsh Aug 01 '12 at 02:20
Hello @Harsh User OpenSL ES library which is a part of android OS and try this question [OPEN SL ES](http://stackoverflow.com/questions/11094377/android-how-to-change-playback-rate-of-music-using-opensl-es) This will help you to use OpensSL ES lib. – Vipul Purohit Aug 01 '12 at 06:15
@Vipul Purhit I am developing a video player which records a video and manipulates its sound i.e change its pitch. how can i use libsonic for that since it is only working for audio files. – Talha Malik Mar 30 '13 at 08:10
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Hi @VipulPurohit I had gone through the Sonic Library and I saw a talking.bin file in that, so can you tell me how can I make that .bin file by recording or manually from any mp3,etc file. – Jagdeep Singh Jun 12 '13 at 07:28

score 2 · Answer 3 · answered Jun 29 '12 at 17:40

Pitch and tempo are very strongly linked. What you're trying to do is called "time stretching", and is a somewhat complicated algorithm. You can find information online about it, and a java library for it can be found here, along with a paper describing the process.

score 0 · Answer 4 · answered Aug 25 '23 at 19:13

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The answer by @Lri does not work for me, it shows error:

'atempo=1.2' is not a suitable output format

The next command works properly:

ffmpeg -i input.mkv -filter:a "atempo=2.0" -vn output.mkv

Taken from ffmpeg.org.

answered Aug 25 '23 at 19:13

Yuriy N.

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How to change audio tempo and pitch individuality using ffmpeg?

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