ffmpeg

正确的命令行是：ffmpeg -i alert-109578.mp3 -acodec pcm_alaw -ac 1 -ar 8000 -ab 64000 .\alert-109578.wav

ffmpeg -i alert-109578.mp3 -acodec pcm_alaw -ac 1 -ar 8000 -ab 64000 .\alert-109578.wav

https://avmedia.0voice.com/?id=311 音视频开发中文
ffmpeg -i alert-109578.mp3 -acodec pcm_alaw -ac 1 -ar 8000 -ab 64000 .\alert-109578.wav
https://github.com/leandromoreira/ffmpeg-libav-tutorial
https://en.wikipedia.org/wiki/Libavcodec
https://g711.org/
https://en.wikipedia.org/wiki/G.711

https://stackoverflow.com/questions/64049222/ffmpeg-encode-a-wav-file-to-g711

https://www.programmersought.com/article/54029478183/
./ffmpeg -i d: \ audio identification \{} -c: a g723_1 -ar 8000 -ac 1 -b: a 6.3k D: \ audio recognition has been transferred \{}'.format(path, out_path)

https://www.bing.com/search?q=ffmpeg+wav+to+g711+&qs=n&sp=-1&lq=0&pq=ffmpeg+wav+tog711+&sc=8-18&sk=&cvid=00C40B4F59E5422087EDA4E28BEF8A8B&ghsh=0&ghacc=0&ghpl=&FPIG=48EE7EEEA00F4136A523781F76709B03&first=11&FORM=PORE
https://stackoverflow.com/questions/69842657/converting-mp3-file-to-wav-g-711-file-using-libav-api

https://superuser.com/questions/1474339/how-to-use-ffmpeg-to-convert-a-g711-u-law-or-a-law-file-to-wav
ffmpeg.exe -f mulaw -ar 44100 -i output.g711u output_file3.wav

ffmpeg -acodec pcm_alaw -i xylofon.wav .\xylofonoutput.wav

-f alaw -f mulaw

https://github.com/search?q=ffmpeg+g711+mp3&type=code&p=3
ffmpeg -i Macroform_-Simplicity.mp3 -ac 1 -ar 8k -ab 64k -f mulaw Macroform-_Simplicity.ulaw
ffmpeg -i test.mp3 -acodec pcm_alaw -f alaw -ac 1 -ar 8000 test.g711a
ffmpeg -i xylofon.wav -acodec pcm_alaw -f alaw -ac 1 -ar 8000 .\xylofonoutput.wav

ffmpeg -i xylofon.wav -acodec pcm_alaw -ac 1 -ar 8000 -ab 64000 .\xylofonoutput.wav
ffmpeg -i alert-109578.mp3 -acodec pcm_alaw -ac 1 -ar 8000 -ab 64000 .\alert-109578.wav

https://ffmpeg.org/pipermail/libav-user/2016-August/009377.html
$ ffmpeg -i input -f alaw out1
$ ffmpeg -i input -f mulaw out2
or:
$ ffmpeg -i input out.al
$ ffmpeg -i input out.ul

ffmpeg -nostats -loglevel 0 -acodec pcm_alaw -f alaw -ar 8000 -i .\xylofon.wav -ar 8000 kkk.mp3