The 8K TV is finally here! Consumer-grade 8K TVs have hit the market, and 8K monitors are also becoming more common. Despite the fact that 4K is still gaining traction, many enthusiasts are already eyeing 8K. While it might seem like a good idea for early adopters, 8K is still far from being practical. Let’s explore why.
One major issue with 8K video is its scarcity. High-resolution devices are often bought for the sake of watching videos, but 8K content is virtually nonexistent. This is largely due to limitations in video encoding technology. Video encoding plays a crucial role in determining how popular a certain resolution becomes. As the resolution increases, so does the bit rate, requiring a higher compression ratio to keep the file size manageable. Without this, storage devices and networks wouldn’t be able to handle the massive data demands.
For instance, during the DVD era, MPEG-2 was used for encoding. When Blu-rays came along, the resolution jumped from 480p to 1080p, necessitating the shift to H.264/AVC, which offered more than double the compression efficiency compared to MPEG-2. In the 4K era, H.264 couldn't cut it anymore, and H.265/HEVC had to step in to make 4K Blu-rays feasible.
Now, with 8K, the resolution quadruples that of 4K. Even with the most advanced H.265/HEVC encoding, the file sizes would still be prohibitively large, making 8K impractical for both optical discs and streaming. The result? Either the quality suffers significantly or the infrastructure simply can't keep up. This is why 8K content remains scarce, and purchasing an 8K device could be a wasted investment.
Even if 8K content were available, playing it back poses challenges. Higher resolutions demand more computational power for decoding. Currently, 4K HEVC decoding requires around 400-500 GOPS. Scaling up to 8K would require exponentially more processing power. Relying solely on CPUs for software-based solutions is unlikely to work well, as they would struggle to maintain smooth playback without lagging or dropping frames. GPU-based hardware acceleration isn’t an option either since none of the major GPU manufacturers currently support 8K hard decoding. Additionally, there are very few devices, such as Blu-ray players or set-top boxes, that can handle 8K playback.
On the output side, 8K resolution can be sent via HDMI 2.1 or DisplayPort 1.4. While HDMI 2.1 is still rare, most modern graphics cards come equipped with DP 1.4, which can handle 8K at 60Hz through dual-link setups. However, DP ports are uncommon on TVs, and HDMI 2.1 support is still nascent in the market.
Despite these challenges, 8K does have some niche applications. Gamers with top-tier setups can enjoy titles rendered in 8K, albeit at reduced settings. For professionals like graphic designers and photographers, the extra detail provided by 8K screens is beneficial. An 8K monitor offers over 33 million pixels, allowing for detailed previews of high-resolution images without the need for scaling.
When will 8K become mainstream? Historically, the transition to higher resolutions is inevitable, but the timing depends on technological maturity and widespread adoption. Looking at the rise of 4K, its success was facilitated by the UHD-BD standard, hardware support from GPUs, affordable 4K players, and widespread availability of 4K displays. Similarly, 8K will need these conditions to mature before it becomes practical. The upcoming 2020 Tokyo Olympics broadcasting in 8K might serve as a catalyst, but it's still too early to expect significant progress in the next couple of years.
In conclusion, unless you're in a specific field where 8K is advantageous, it’s best to wait before investing in 8K technology. The current ecosystem isn’t ready to support 8K effectively, and rushing to buy 8K products could lead to disappointment. Let’s approach this with caution and patience.
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