[FFmpeg-user] the out mp3 file is shorter than the .caf file

[notedit]

hi,

when i use the ffmpeg to transcoding a ilbc encoding caf file to a mp3
file.  the out mp3 file is shorter than the caf file.
the command is:/usr/local/bin/ffmpeg -acodec ilbc -i xxx.caf -ab 16k
xxxx.mp3 .

anyone knows the answer?

thx