Not mine, found it on twitter. Owner reports it was recording onto a high speed usb that was also used with his wife's model 3 and has no issues. MCU1 problem?
MCU1 with HW3 dashcam video. Very bad
- Thread starter viper2ko
- Start date
Not mine, found it on twitter. Owner reports it was recording onto a high speed usb that was also used with his wife's model 3 and has no issues. MCU1 problem?
TommyElectron
Member
Looks like MCU can't keep up with the encoding power needed causing the dropped frames. Can't be the USB write speed if it works fine on 3 unless MCU2 has hardware encoder. Does MCU2 have hardware encoder?
I'm afraid to upgrade to AP3 without doing MCU2 upgrade too because of potentially making my MCU1 slower than it is now.
I'm afraid to upgrade to AP3 without doing MCU2 upgrade too because of potentially making my MCU1 slower than it is now.
Intel MCUs have much much faster IO especially when it comes to USB compared to the ancient 32-bit ARM platform on the Tegra 3. The Gordon Peak chipset also has Intel QuickSync Video accelerated encoding but I’m not sure if MCU2 re-encodes the video stream.
MCU1 is so strained that I wouldn’t be surprised if dashcam takes last priority.
ucmndd
Well-Known Member
Hasn’t dashcam been available on MCU1 / AP2.5 cars forever now? Never seen reports of similar problems.
Yes I have Dashcam on my MCU 1, hardware 2.5 and it works fine.
rush6410
Member
My dashcam video is the same as above; choppy and pixelated. Must not be an MCU1 but rather original ap2.0 hardware.
Actually, my MCU2 clip seems fine? All my clips are like the example. Rear is flawless and in color. Maybe it is the SSD used? I can upload the other ones if you'd like more examples.
EDIT: Watched YouTube clip I uploaded and it is way more compressed than what I viewed on my computer. I'll try to get YouTube to stop making it so lossy compressed but there is no artifacting like I see in other MCU1 FSD computer dashcam clips. My car is AP2 (as you can see).
EDIT: Watched YouTube clip I uploaded and it is way more compressed than what I viewed on my computer. I'll try to get YouTube to stop making it so lossy compressed but there is no artifacting like I see in other MCU1 FSD computer dashcam clips. My car is AP2 (as you can see).
MorrisonHiker
S 100D 2021.4.12
It could be related to the eMMC memory going bad in MCU1. My MCU2/AP3 car (upgraded from MCU1/AP2) doesn't have any stuttering.
I did with no issue. Not planning on MCU2 upgrade unless my MCU1 fails. The only thing I use MCU for is Navigation, Spotify and Tune in. Performance is perfectly fine. I plan on trying dashcam I'll see how that goes. Can't imagine using MCU for internet or Netflix or games.
In that case, what explains that this wasn't an issue with HW2.5 and MCU1 hardware since the release of orignal dashcam? Only HW2.0 to 3.0 upgraded cars have this issue. Some parts of Original 2.0 hardware or/and HW3.0 not working properly in tandem.
I recall Tesla noting that the AP3 computer detects significantly more data points than the AP2 (and even the AP2.5) computer. Even though the actual AP computer is supposedly doing all that processing, it still needs to interface with the MCU and is probably taxing the limited resources.
Anecdotally, this is probably why people are saying that the MCU1 is much more sluggish with the AP3 hardware. It's the age-old analogy of a fast thinker who talks really slow.
Anecdotally, this is probably why people are saying that the MCU1 is much more sluggish with the AP3 hardware. It's the age-old analogy of a fast thinker who talks really slow.
MorrisonHiker
S 100D 2021.4.12
I can imagine that a laggy MCU with failing memory would affect USB write speeds. Something has to control the USB and route data to it.
We have an AP2.5/MCU1 that now has similar poor video quality. This car is showing signs of eMMC failure as well. This car used to be able to record video just fine. We've tried using the same SSD that we use on other vehicles and it still has issues. The same drive in other cars works perfectly.
Our AP3/MCU2 car upgraded from AP2/MCU1 has no problems with video quality.
Certainly mcu1 is over taxed from a cpu load perspective. My point was that dashcam/Sentry doesn't wear out emmc.
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