Emerge Tools

Emerge helps teams like @Spotify, @Duolingo, @Bumble, @Square, @Tinder, @Dropbox, @OpenAI & @CashApp build better mobile apps 🚀 Now a part of @Sentry 🧠

[Emerge Tools @emergetools]

Good question @VishalMalvi_ ! Here's what's going on behind the scenes of the @gmail iOS app 👇

[Emerge Tools @emergetools]

@KhalidWarsa

[Emerge Tools @emergetools]

1. why do I need to install an app to set up a printer
2. why is that app 400+ MB

[Emerge Tools @emergetools]

@SoVeryCuul

[Emerge Tools @emergetools]

...I knew this was familiar 😐
https://t.co/hPDrmK7k5n

[Emerge Tools @emergetools]

Time to open up the printer to see what’s going on

… aka time to look at the HP iOS app to see why it’s 400 MB 🖨️

[Josh Cohenzadeh @jshchnz]

At @Sentry’s AI offsite this week, @indragie & I decided to kick things off with a bang❗️

We’d seen a video where friends bought each other ridiculous shirts before a flight and had to wear whatever they were given... so naturally, we did the same for the offsite (ft. @zeeg)

If you see us around SF today, make sure to say hi

[Emerge Tools @emergetools]

@AymenMak84548 Size Analysis by Sentry 🙂
https://t.co/gGSAlK3HOl

[Emerge Tools @emergetools]

Alright, we bit

It's the 83.5 MB flutter assets that grind our gears w/ an egregious example of bad practice

[Basil🧡 (they/them) @LinkofSunshine]

Every app now is insanely sized. Why is my Wingstop app half a GB. How does that even happen!! These ppl should be beaten in the streets until it gets under 50mb again

[Emerge Tools @emergetools]

@jazzychad

[Emerge Tools @emergetools]

@Nailington1 @advaithj1 @LinkofSunshine

[Emerge Tools @emergetools]

@thinkverse

[Emerge Tools @emergetools]

@KsbjA @LinkofSunshine

[Emerge Tools @emergetools]

@harry__politics @LinkofSunshine

[Emerge Tools @emergetools]

@harry__politics @LinkofSunshine https://t.co/Z2PtgJ6cML

[Emerge Tools @emergetools]

Alright, we bit

It's the 83.5 MB flutter assets that grind our gears w/ an egregious example of bad practice

[Emerge Tools @emergetools]

@advaithj1 @LinkofSunshine https://t.co/Z2PtgJ6cML

[Emerge Tools @emergetools]

Alright, we bit

It's the 83.5 MB flutter assets that grind our gears w/ an egregious example of bad practice

[Emerge Tools @emergetools]

@KsbjA @LinkofSunshine https://t.co/Z2PtgJ6cML

[Emerge Tools @emergetools]

Alright, we bit

It's the 83.5 MB flutter assets that grind our gears w/ an egregious example of bad practice

[Emerge Tools @emergetools]

The real TL;DR
https://t.co/foZltFbWRP

[Emerge Tools @emergetools]

There's no excuse anymore, Sentry Size Analysis is free 100 builds / month

That's a nightly + weekly releases on Android & iOS and then some
https://t.co/gGSAlK4fDT

[Emerge Tools @emergetools]

Other notes:

- Flutter app
- 207 MB of dynamic frameworks (worse for size compared to static)
- lot of external dependencies

[Emerge Tools @emergetools]

We focused on the video file b/c it's so easy to optimize + having a 23 MB onboarding video, seen once by user, is ... not ideal

But all the images are also easily optimized, saving 30+ MB.

Optimizing the video & images + stripping binary symbols would save ~75 MB, a third of the total app size

[Emerge Tools @emergetools]

TL;DR on the video file, it's encoded with way higher bitrate than needed

If you want to learn more about bitrate, check out this thread
https://t.co/Pzsr0FjulN

[Emerge Tools @emergetools]

It’s Friday, we do have a job, and we do have things to do

But we’re going to tell you about bitrate today

Why this @weedmaps video on the left is 14x bigger than the one on the right, despite looking the same 🌿

[Emerge Tools @emergetools]

Here's the metadata comparison of the new file + a side-by-side of a random frame, which is virtually indistinguishable

Note the lower bitrate (15.45 Mbps vs. 3.42 Mbps) and file size (23.2 MB vs. 5.1 MB)

[Emerge Tools @emergetools]

This code is re-encoding the video with a constant rate factor of 28 (`-crf 28`)

Low CRF (0) = higher quality, larger file size
High CRF (51) = lower quality, smaller file size

In this case, CRF 28 gave us the same video with a lower bitrate & a visually similar output

[Emerge Tools @emergetools]

It's a 12 second video of some wings flying around

What's egregious is that 1 line of ffmpeg reduces this by ~80% (and you could do even more)