Audio problem after upload to Youtube/Facebook

[sendspellme]

Hi

As topic, I can hear the sound of the video without problem in my computer. But after upload to Youtube/Facebook, it will has problem (only can hear zizizizizizizizi sound).
I think it has something to do with "fake stereo from a mono track by inverting one channel is the problem."
But I dont know how to solve it with ffmpeg.
Any expert here can teach me to correct command?
Thanks !


General
Complete name : C:\a.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/mp41)
File size : 583 KiB
Duration : 36s 826ms
Overall bit rate mode : Constant
Overall bit rate : 130 Kbps
Writing application : Lavf56.30.100

Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 36s 826ms
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Frame rate : 46.875 fps (1024 spf)
Compression mode : Lossy
Stream size : 576 KiB (99%)
Language : English
Default : Yes
Alternate group : 1

[Baldrick]

Try reconvert the audio.

Open the video in for example avidemux. Under video choose copy, Under audio choose mp3(or aac), under format choose mp4, save as a new video.mp4. Check how it sounds. Upload to youtube.

[JVRaines]

FFmpeg turns out to be a somewhat gnarly command. To use only the left channel:

ffmpeg -i myinput.mp4 -filter_complex "channelsplit[L][R],[R]anullsink" -c:v copy -c:a aac -b:a 160k -map 0:v -map [L] myoutput.mp4

[sendspellme]

@Baldrick I have avidemux in my pc, but didnt think of using it. Will try it. Thanks!

@Jvraines I tried and it works. Appreciate it! If I want to use only right channel (just in case for the future)
this is the correct command?

ffmpeg -i myinput.mp4 -filter_complex "channelsplit[L][R],[L]anullsink" -c:v copy -c:a aac -b:a 160k -map 0:v -map [R] myoutput.mp4

Really appreciate the reply, you used seconds to reply me, but saved me few hours of works..
I have spent several hours to figure out the problem...

[JVRaines]

You got it.

[sendspellme]

Thank you!!!!

You got it.