Changing the channel of a messed up audio in video

[[ss]vegeta]

Hello
I have a video file with messed up audio channels. When I play the video, the audio comes only from left speaker.
Here's media info

Both audio streams are messed up (on both, sound comes from left speaker only).
When I open the video in Sony Vegas for example, I see this (I removed the surround stream, don't need it)

In Sony Vegas I can easily fix for the sound to come from both speakers by choosing Combine or Left only. Both of this fix the audio


However, I want to do this with with ffmpeg.

I extracted the audio from the file with MeGUI.

I read this
https://trac.ffmpeg.org/wiki/AudioChannelManipulation

and I tried ffmpeg with the following command

ffmpeg -i audio.aac -filter_complex "[0:a]channelsplit=channel_layout=stereo:channels=FL[left]" -map "[left]" front_left.aac

But I get an error


I want to change the channel, without reencoding of the audio (is this possible?) and then just mux the audio and video.

Can anyone help me?
Thanks

[ProWo]

Try this:
ffmpeg -i audio.aac -filter_complex "channelmap=map=FL-FL|FL-FR:channel_layout=stereo" output.aac

This should copy the left channel to both left and right channel and give you a stereo output.

[[ss]vegeta]

Try this:
ffmpeg -i audio.aac -filter_complex "channelmap=map=FL-FL|FL-FR:channel_layout=stereo" output.aac

This should copy the left channel to both left and right channel and give you a stereo output.

Thanks man, you are a lifesaver.
It worked.