[FFmpeg-user] Error during conversion of MP4 to WAV

[Pierre Frenkiel]

hi,
try my 2 following scripts: mp4tomp3 and mp3towav
============ mp4tomp3 ==================================================
#!/bin/bash
#?: usage: mp4tomp3 [-d] file.mp4 [ file2.mp4 ... ]
#?:    convert mp4 to  mp3
#?: -d: delete mp4 file after conversion
#?:
[[ -f /etc/setenv ]] && . /etc/setenv
[[ $1 = -h ]] && xhelp $0
[[ -n $DBG ]] && set $DBG

unset DEL
if [[ $1 = -d ]]; then
    DEL=true
    shift
fi

for F in $*
do
    FN=${F%.mp4}
    ffmpeg -i $FN.mp4  -acodec libmp3lame -ab 256k $FN.mp3 || exit 1
    touch -r $F $FN.mp3
    [[ -n $DEL ]] && rm -f $F
done
=============== mp3towav ==========================================
#!/bin/bash
#?:     usage: mp3towav  [options] infile[.mp3]
#?:  infile: file name
#?:  output is infile.wav
#?:  options
#?:     -n: normalize the output file
#?:     -g gain: add this option to normalize-mp3
#?:     -rm: remove mp3 file if no error
#?:  examples: 
#?:  mp3towav in
#?:  mp3towav in.mp3

. /etc/setenv
[[ $1 = -h || $1 = --help ]] && xhelp $0
[[ -n $DBG ]] && set $DBG
unset NORM RM
unset GAIN
while true
do
    case  $1 in
    -n)
       NORM=true
       shift
    	;;
    -g)
       GAIN="-g $2"
       shift 2
    	;;
    -rm)
       RM=true
       shift
    	;;
    *)
       break
    	;;
    esac
done

typeset -l OUT
F=$1
IN=${F%.mp3}.mp3
[[ -f $IN ]] || mexit mp3towav 1 "$IN not found"
IND=`dirname $F`
OUT=${IND}/`fname $IN`.wav
if [[ -f $OUT ]]; then
    cpb $OUT
    rm -f $OUT
fi

lame --replaygain-accurate --preset medium $IN $OUT || exit 1

touch -r $IN $OUT
[[ -n $RM ]] && rm -f $IN
[[ -z $NORM ]] && exit 0
norm $GAIN $OUT
=========================================================


Pierre Frenkiel

On Wed, 5 Apr 2023, Nicolas George wrote:

> Alexander Gorodetski (12023-04-05):
>> I have MP4 file audio encoded with g722.1 (I do not know the reason why MP4
>> was created in such a strange way).
>>
>> In any case I am trying to convert the MP4 file to WAV format and I receive
>> the following strange message. It seems that ffmpeg does not support the
>> g722.1 audio format. What can be a solution to this problem?
>
> Hi.
>
> Do you know at least one software that can read that file?
>
> Regards,
>
> --
>  Nicolas George
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