Slow encoding

[floydback]

You write

Fast mp3 encoder written in JavaScript. On my machine it works 20x faster than realtime
but I have a problem with it.

I have demo.mp3 file with total duration 54 sec
On my machine
time sox demo.mp3 -C 256 ~/demo2.mp3
real 0m1.557s
user 0m1.527s
sys 0m0.018s

When I use lamejs encoding spend ~50 sec and it's too much!

Now I try to use another js encoder (https://higuma.github.io/mp3-lame-encoder-js/) and it spent only ~3sec!

What I do wrong? My code:

buffer // <-- decoded with web audio api AudioBuffer
let mp3buf = [];
let mp3encoder = new lamejs.Mp3Encoder(buffer.numberOfChannels, buffer.sampleRate, 192)
mp3buf.push(mp3encoder.encodeBuffer(buffer.getChannelData(0), buffer.getChannelData(1)))
mp3buf.push(mp3encoder.flush())
let blob = new Blob(mp3buf, { type: 'audio/mp3' })

[danibezoff]

@floydback are you using the npm package? I've managed to reduce the encoding time by nearly 6 times with the help of UglifyJs.

Actually, their minified version seems to be even faster, you should use it.

[vasinl124]

I'm in the same boat right now. I have > 5 min wav file. It took me 7-8mins to convert. Can you show me how you can reduce the encoding time? I'm using React.

[rafael2k]

In firefox is much faster than in chrome. Strange.

[rafael2k]

My bad. The minified version works fast.