Hi,

I am downgrading the bitrate of mp3 files. Is there a way to find out the
file size of the converted file before actually converting the audio file.

I wanted to convert a 320 kbps mp3 file to a 64 kbps mp3 file and send it
over the wire using http.
For this I need the content-length filed which is the size of the converted
file.
I preserved the sampling rate and number of channels of the original file.

Is this formula corrext
inputFormatContext->duration * outputCodecCtx->birate (given that the number
of channels are same)

for some files this formula works, but not for all the files.
Is there a more accurate way to calculate the file size beforehand.

Sandeep.
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