18

I would like to generate an audio file with a sine (sinusoid) wave with FFmpeg. I know there is a sine filter but that's as far as it goes.

I tried:

fmpeg -filter "sine=48:1:5" -c:a pcms16le test

to create 5 seconds of audio at 48kHz in PCM S16LE format, but I got the following error message:

Output file #0 does not contain any stream

and the test file is empty.

Samir
  • 21,235
UmNyobe
  • 375
  • 1
  • 3
  • 10

2 Answers2

35

To generate a 1000 Hz signal for 5 seconds duration use this:

ffmpeg -f lavfi -i "sine=frequency=1000:duration=5" test.wav

You can add -c:a pcm_s16le:

ffmpeg -f lavfi -i "sine=frequency=1000:duration=5" -c:a pcm_s16le test.wav

To also set the sampling rate to 48 KHz:

ffmpeg -f lavfi -i "sine=frequency=1000:sample_rate=48000:duration=5" -c:a pcm_s16le test.wav
Rajib
  • 3,156
15

If you wanted to do this in stereo, you would do the following:

ffmpeg -f lavfi -i "sine=frequency=1000:duration=5" -ac 2 output.wav

You could also use -filter_complex with amerge:

ffmpeg -f lavfi -i "sine=frequency=1000:duration=5" -filter_complex "[0:a][0:a]amerge=inputs=2[aout]" -map "[aout]" output.wav
Community
  • 1
ocdude
  • 151