convert G.723.1 to normal wav and split channels? - audio

Question

I have a wav file who's info is
ion#aurora:~/Inbound$ mediainfo 48401-3405-48403--18042018170000.wav
General
Complete name : 48401-3405-48403--18042018170000.wav
Format : Wave
File size : 327 KiB
Duration : 4mn 11s
Overall bit rate : 10.7 Kbps
Audio
Format : G.723.1
Codec ID : A100
Duration : 4mn 11s
Bit rate : 10.7 Kbps
Channel(s) : 2 channels
Sampling rate : 8 000 Hz
Stream size : 327 KiB (100%)
and the audacity shows like this
To tackle it I tried
ffmpeg -i 48401-3405-48403--18042018170000.wav -f wav test.wav
But it just appends the second channel at the back of first channel , So I get only single channel.
and its media info is:
ion#aurora:~/Inbound$ mediainfo test.wav
General
Complete name : test.wav
Format : Wave
File size : 7.67 MiB
Duration : 8mn 22s
Overall bit rate mode : Constant
Overall bit rate : 128 Kbps
Writing application : Lavf56.40.101
Audio
Format : PCM
Format settings, Endianness : Little
Format settings, Sign : Signed
Codec ID : 1
Duration : 8mn 22s
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 1 channel
Sampling rate : 8 000 Hz
Bit depth : 16 bits
Stream size : 7.67 MiB (100%)
Any idea how to solve this?
PS: When I hear the original wav file, It feels like the talking is too fast.
This is how the media info of processed file should look like.
ion#aurora:~/Downloads/Call Recordings$ mediainfo 9417648939\ \(G\ Call\)_Done.wav
General
Complete name : 9417648939 (G Call)_Done.wav
Format : Wave
File size : 8.01 MiB
Duration : 8mn 44s
Overall bit rate mode : Constant
Overall bit rate : 128 Kbps
Audio
Format : ADPCM
Format profile : U-Law
Codec ID : 7
Codec ID/Hint : CCITT
Duration : 8mn 44s
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Sampling rate : 8 000 Hz
Bit depth : 8 bits
Stream size : 8.01 MiB (100%)

Answer 1

1) ffmpeg from ubuntu (18.04) repository has a bug (ffmpeg does not detect stereo channel in g723). Use FFmpeg from git repository https://github.com/FFmpeg/FFmpeg
git clone https://github.com/FFmpeg/FFmpeg
cd FFmpeg/ && ./configure --disable-x86asm && make
2) Now you can convert audio:
FFmpeg/ffmpeg -i test.g723 test.wav
3) And separate channels:
FFmpeg/ffmpeg -i test.wav -filter_complex 'channelsplit=channel_layout=stereo[L][R]' -map '[L]' test.wav -map '[R]' test.wav