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My Totally Unscientific Spotify Bitrate Calculation

My Totally Unscientific Spotify Bitrate Calculation

So I've spent a lot of time comparing the native Spotify client with streaming Apple Music via Bluetooth. It's really a toss up to my ears. In summary, Spotify seems to have tighter bass at times, but then again it sometimes sounds a bit harsh overall to me. Apple Music seems to have a bit muddier bass, but it's not noticeable if that's the only thing you're listening to.

Today, though, I had some unused PTO that I needed to burn. I realized halfway through the day that I had the internet connection all to myself so it was prime time to do some experimenting. I have a SNMP endpoint that will tell me transfer rates and total transfers, up and down. I went to my car and brought up a playlist on Spotify that I had never listened to before.

https://photos.app.goo.gl/hoWCMTnezSJ1VtLy9

I reset the totals on my SNMP monitor to zero and then played the first 5 songs, waiting about 30s on each song, on that playlist. And then looked at the totals

https://photos.app.goo.gl/D7iji9guRXnDHksa8

17.1 MB, but I do have residual traffic on my network so I timed 4 minutes of traffic without downloading any songs

https://photos.app.goo.gl/QyKhgPKtpgHsDqhw8

About 2.5 MB over ~4 minutes which is about the time it took to do this test...I did say that this was totally unscientific.

Altogether, the songs add up to 16:18 or 978 seconds

(17.1 - 2.5 = 14.6 MB) / 16.3 min = 0.895 MB/min...but let's round that up to 0.9 to make it even less scientific

I mentioned earlier that I have Apple Music and my CD library was encoded at 256kbit so I started checking my library. Billy Joel's "This is the time" runs 5:02, the file size on my computer is 9.9MB. Blue Man Group's "Piano Smasher" runs 3:01 and weighs in at 6.9MB. Dire Straits' "Brothers in Arms" runs 6:59 and takes up 14.3MB. So roughly 2MB per minute or so.

My conclusion...Spotify is running around 128 kbits

I used this site to corroborate the files sizes for different bitrates as well

https://www.colincrawley.com/audio-file-size-calculator/

Mike UpNorth_ | 6 dicembre 2019

Awesome review!
When I contacted Spotify via chat they told me they stream to the Model 3 at 256 kbits.

Teslaguy | 6 dicembre 2019

I have Slacker account that is turned on to 320 bits. I know that it sounds better than their free Tesla connection but can't verify that it is really 320 bits. Therer should be a noticeable difference between 128 and 256 on Spotify.

mcmoyer | 8 dicembre 2019

I expanded my test to include the included slacker account and my iPhone playing music straight from Apple Music

I used the "Top Hits" station on Slacker and played 5 songs from that for a total of 16:13s and a total of 13.1 MB transferred. That comes out to around around 0.8MB/min

I played "The Eternal Remixes" from U2 on my iPhone straight from the Apple Music suggestions. 4 songs that clock in a 16 minutes and the total downloaded was 43.5 MB which is about 2.7 MB/min