Here we need to create a mp3 file with maxbit rate 56kbps. So I used -ab 56K but unfortunately It creates with 64K max bit rate.
So I want to know , is there any other command to create the file with proper maxbit rate?
and another question is what is the command in ffmpeg to get the max bit rate?
Answer of the above two questions are relly helpful to me.
Please remove -v:a 1 as this maps to LAME's quality setting, it overrides -ar 56K.
Edit: This looks like it produces a CBR file. You can use -v:a 9 for a closer approximation. Average bitrate encoding (A variant on how VBR is calculated) doesn't look achievable through FFMPEG so you may need to use LAME's direct executable in the command line if you need absolute accuracy.