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Title: input frame size in lame
Post by: gonzo1948 on 2014-04-07 17:10:24

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

Title: input frame size in lame
Post by: saratoga on 2014-04-07 17:42:28

mp3 is always 1152 samples, even at lower sampling rates.

Title: input frame size in lame
Post by: halb27 on 2014-04-07 17:43:58

There's no such thing like a PCM frame size. A mp3 encoder just takes sequences of 1152 wave samples for the mp3 frames.

Title: input frame size in lame
Post by: gonzo1948 on 2014-04-09 23:54:38

thanks guys for clarifying that for me.

-Andres

HydrogenAudio

Lossy Audio Compression => MP3 => MP3 - Tech => Topic started by: gonzo1948 on 2014-04-07 17:10:24