Tesla to use internal microphone to detect emergency vehicles and aid in FSD

By Nuno Cristovao

As Tesla continues to inch closer to releasing Autopilot on city streets, and one day full self-driving, they need to account for more occurrences on the road. As we talked about briefly, Tesla now detects brake lights on vehicles in the latest beta and will soon also detect turn signals and even hand signals.

Elon has also said that Tesla will soon detect emergency vehicles such as ambulances, police cars and fire trucks. For Tesla to assess the situation properly they will also need to detect whether the vehicle is in an emergency situation so that it can follow proper driving procedures, such as pulling off, stopping at a green traffic light or letting the vehicle pass.

In order for Tesla to be able to do this, they will not only detect the emergency vehicles lights, but will also look for sirens.

Tesla Model 3 interior

Teslas do not currently have external microphones. The only microphones they have currently is the internal one used for voice commands and hands-free calling. Elon Musk confirmed that Tesla will start utilizing the internal microphone to help detect the presence of emergency vehicles.

Listening for sirens may only be the beginning if Tesla is successful in detecting situations using sound alone. What if they could detect other sounds that help the car further understand the environment and the current situation. Maybe listening for car honks, screeching tires or crashing sounds may be helpful. This may even be the start of Tesla adding a “Hey, Tesla”-like wake command to activate the voice-assistant like VW does in their ID vehicles. When Tesla starts to use the microphone for things beyond Bluetooth calling and voice commands, it could open up a whole new door of possibilities.

It’s great to see Tesla moving forward and increasing Autopilot’s capability, but this feature comes with some possible issues. How will Tesla distinguish between real emergency vehicle sounds and sirens coming from music or a ringtone?

The short answer is they probably won’t. In fact, who hasn’t been tricked before when hearing police sirens on the radio only to look around them and realize it’s not real. Tesla appears to be building FSD features based on human abilities, such as seeing and hearing. If a human can do it based on vision and hearing, then why not a machine? Especially if that machine has 360-degrees of vision and the ability to make pinpoint calculations in a fraction of a second.

Tesla Smoking While Supercharging? A Look at What's Actually Happening

By Karan Singh
Hot_Engineering3140 on Reddit

Winter is here, and temperatures are dropping, so one of the most common Tesla questions is about to resurface.

If you’ve landed here after frantically searching about “smoke” coming from your Tesla while Supercharging, take a deep breath—it’s completely normal.

Tesla Smoking While Charging

If you’re Supercharging in freezing weather—even with preconditioning—you might notice steam rising from your Tesla. But rest assured, your car isn’t smoking.

Your Tesla’s heat pump is hard at work warming both the cabin and battery to keep you comfortable and ensure optimal charging temperatures. Over time, condensation and ice build-up in the heat exchanger coils.

Why Does It Happen?

When you reach a Supercharger with your vehicle, the heat pump is still running hot, but without the cold air from driving to keep the heat exchanger coils cool, the ice and condensation quickly start to evaporate—creating what looks like smoke.

Since this typically happens near the front of the vehicle, where a car would traditionally have an engine, new vehicle owners can be startled by the discovery. However, rest assured that it’s just water vapor and it’s completely normal in cold weather.

In fact, this behavior can be experienced in any EV with a heat pump in cold climates. So, if you saw steam coming out of your vehicle and panicked, don’t worry—you’re not alone.

Now that you know what’s happening, go ahead and Supercharge with confidence.

Tesla Improves YouTube App With Smoother Playback

By Karan Singh
Not a Tesla App

Tesla made a lot of improvements in the 2024 Holiday Update, including more than 15 undocumented improvements that were included in the release. One of these was a stealthy performance improvement to the YouTube app.

Several people have mentioned they’ve seen improved performance on YouTube since this year’s Holiday Update - and there’s an interesting reason why.

YouTube Improvements

The improved YouTube performance in Tesla vehicles comes from an unexpected source—Tesla actually rolled back support for YouTube’s newer AV1 video encoding. Instead, vehicles now default to the older VP9 encoding standard.

While AV1 is highly efficient in terms of bandwidth, it requires considerably more processing power to decode and display videos. VP9, on the other hand, is less computationally demanding but uses more bandwidth to achieve the same video quality. This trade-off means smoother playback and better overall performance, even if it comes at the cost of slightly higher data usage.

Intel Inside

The VP9 video codec that the YouTube app is now using is much easier to decode, making it less taxing on the vehicle’s processor. This change is particularly beneficial for Tesla vehicles with Intel processors, which previously struggled to stream video at just 720p. When using AV1, these vehicles often experienced stuttering, sometimes forcing the YouTube app to automatically downgrade playback to 480p.

With this update, Intel-based Teslas should now be able to stream at 1080p smoothly. Streaming at 1440p is also possible, although occasional stutters still occur as the system keeps up with the decoding process.

Intel-based vehicles are the big winners with this change, but this appears to affect AMD Ryzen-based infotainment units as well, providing even smoother playback.

Chromium Web App

Tesla’s Theater apps aren’t native applications; instead, they run as chromeless web apps, leveraging the open-source browser built into Teslas known as Chromium (the open-source version of Chrome). Although this works quite well, there is a severe limitation - Chromium hardware acceleration isn’t supported on Linux, the operating system Tesla uses for their OS.

As a result, Tesla vehicles rely on software decoding instead of hardware decoding, which would otherwise handle video playback far more efficiently. A potential solution could be for Tesla to transition away from Chromium-based web apps in favor of a Mozilla Firefox-based browser, as Firefox does support hardware acceleration on Linux. This switch could also open the door to better streaming performance and the possibility of expanding Tesla’s in-car entertainment options.

However, Tesla’s choice of Chromium likely stems from Digital Rights Management (DRM) requirements for streaming services like Disney+ and Netflix, which rely on DRM-enabled playback. Firefox on Linux has had inconsistent support for DRM due to codec availability and variations in operating system versions.

We’re hopeful that Tesla will either adopt Firefox or develop a fully native application to improve video streaming, rather than continuing with the current web-based Tesla Theater. This shift could also pave the way for additional in-car applications built on Tesla’s native Linux environment—perhaps even reviving the long-rumored Tesla App Store.

Regardless, this update is a welcome improvement, particularly for YouTube, which remains one of the most widely used Theater Mode apps due to its accessibility, free content, and mix of short and long-form videos. It remains to be seen whether similar improvements are made for Netflix, Disney+, or other streaming platforms.

If you’ve noticed improved performance in Theater Mode, now you know why.

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