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Topic: input frame size in lame (Read 4409 times) previous topic - next topic
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input frame size in lame

I am using lame in a streaming, RTP, application. I have seen reference to an input PCM frame size of 1152 samples.

Q1: is this regardless of the sample frequency of 44100 or 48000?
Q2: is this very strict?  That is, are there any issues if I use different input PCM frame sizes, for example, 882 samples for a frame period of 20 milliseconds @ 44100?  or larger, say  2880 for 60 milliseconds @ 48000? 

Thanks,

-Andres

input frame size in lame

Reply #1 –
mp3 is always 1152 samples, even at lower sampling rates.

input frame size in lame

Reply #2 –
There's no such thing like a PCM frame size. A mp3 encoder just takes sequences of 1152 wave samples for the mp3 frames.
lame3995o -Q1.7 --lowpass 17

input frame size in lame

Reply #3 –

thanks guys for clarifying that for me.

-Andres