Remove extra noise from ffmpeg video

Question

I am using the following command to record the audio and video:

ffmpeg -loglevel warning -y -f v4l2 -s 544x288 -i /dev/video0 -vstats -vstats_file '/home/2014-05-13T07-18-37/left_cam-stats' -f pulse -name 'Unknown source 0' -i alsa_input.pci-0000_00_1b.0.analog-stereo -filter lowpass -f pulse -name 'left_mic 0' -i alsa_input.usb-046d_0823_D81A0330-00-U0x46d0x823_1.analog-stereo  -f pulse -name 'right_mic 1' -i alsa_input.usb-046d_0823_4B709030-00-U0x46d0x823.analog-stereo  -f pulse -name 'default 0' -i default  -f mpegts -crf 20 -r 24 -pix_fmt yuv420p -vcodec libx264 -vprofile baseline -t 02:00:00 -map 0:0 -map 1:0 -map 2:0 -map 3:0 -map 4:0 /home/left_cam.mp4

It record both audio and video from different devices.

But the audio comes with the horrible noise (feed back). I want to remove that noise form the recording.

Is there any way to solve this problem?

Solution

Using Sox you can you can reduce noice.

Sox can be installed with :

sudo apt-get install sox

To use sox, you can follow this article at www.zoharbabin.com.

Or:

For direct use with ffmpeg you can try following code.

Source :ubuntuforums.org

ffmpeg -i input.avi -vcodec libx264 -crf 24 -preset slow -filter:v hqdn3d=4.0:3.0:6.0:4.5 -acodec aac -strict experimental -ab 192k output.mp4

Comments

[Takkat]

For background noise removal see: askubuntu.com/questions/391798/… and askubuntu.com/questions/429480/…

[xiota]

please explain which flags in the command are enabling noise reduction.