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Topic: Which bitrate for mono? (Read 3270 times) previous topic - next topic
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Which bitrate for mono?

I use Lame 3.97b1 to transcode movie soundtracks from AC3.
My usual command line (in foobar 0.9b) is -S -b 160 -h - %d
Now, I've got one mono track to transcode (AC3 192k - 2 channels but they are the same, I'll use foobar's downmix-to-mono DSP), do you think 80k is okay or will I loose quality compared to 160k stereo?

Which bitrate for mono?

Reply #1 –
With 2 channels Lame is making use of the redundancy between both channels.
In mono you have no redundancy (of course), so you will need more than half the bitrate.
I'd say about 112kbps in your case.

Which bitrate for mono?

Reply #2 –
Thanks I'll probably be using 112k then =)
In fact I was suspecting It'd need a higher bitrate, but wasn't 100% sure as -h alone will encode stereo at 128k and mono at 64k.

Which bitrate for mono?

Reply #3 –
Quote
In fact I was suspecting It'd need a higher bitrate, but wasn't 100% sure as -h alone will encode stereo at 128k and mono at 64k.

Hum...should be changed
 

Which bitrate for mono?

Reply #4 –
Maybe it was this way because mono is more likely to be speech or some lo-fi material.