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Uncompressed Video vs Compressed Video

Uncompressed Video vs Compressed Video

Table of Contents

The most important thing to understand about HDMI extender products is to know whether Uncompressed Video vs Compressed Video signals are transmitted, HDMI transmitters (including wireless HDMI extender products) use two kinds of video formats: uncompressed video and compressed video.

Uncompressed Video vs Compressed Video

Definition of Uncompressed Video:

Uncompressed video is digital video that has never been compressed before, which is commonly used in the digital camera, TV screen, DVD player, VCR, camcorder, and other similar electronic devices. The uncompressed video can be transmitted over digital audio interfaces, including HDMI, DVI, display port, and S/PDIF. There are also standards developed for the streaming of uncompressed video over networks. Such as wireless standards (WiFi) can transmit uncompressed SD videos, but not HD videos because the HD bits per second would surpass the available network bandwidth.

The Data Rate of Uncompressed Video:

The uncompressed video has a constant bitrate that is based on pixel representation, image resolution, and frame rate. 

Data rate = color depth × vertical resolution × horizontal resolution × refresh frequency; For example:

24-bit, 720p @ 60 fps: 24 × 1280 × 720 × 60 = 1.32 Gbit/s
24-bit, 1080p @ 60 fps: 24 × 1920 × 1080 × 60 = 2.98 Gbit/s.
24-bit, 4K UHD @ 60 fps: 24 × 3840 × 2160 × 60 = 11.9 Gbit/s.

What is the Wigig? 

As stated above, uncompressed high definition (HD) videos require huge data transfer capacity; if you want to transmit it wirelessly, which requires a very wide bandwidth to enable high throughput rates. 

Considering the high bitrate that exceeds the normal WiFi bandwidth, High-definition video can be transmitted using high-definition interfaces such as WiGig. WiGig is an industry-standard wireless technology designed to provide high-speed and short-range data transfers from one device to a display device, which was first introduced in 2012. WiGig provides very high throughput rates and operates in the microwave section of the spectrum at 60 GHz. 

Consequently, it is sometimes called 60 GHz Wi-Fi or Micro radio WiFi, WiGig wireless technology works with existing IEEE 802.11 standards. It includes both IEEE 802.11 ad and the IEEE 802.11 ay standard. Wigig delivers up to 7 gigabits per second (Gbps) of throughput over distances of 10 meters, which is enough for 1080P uncompressed video streaming.

Intel also released its version of WiGig called Wireless Display (WiDi) based on the same technology as WiGig in 2012.

Application of Wireless HDMI Adopted Un Compressed Video Format:

For some applications requiring low or zero latency wireless HDMI solution, like AR/VR HMD and the wireless gaming market, Wigig could be a good solution. 

https://en.wikipedia.org/wiki/WiGig

Pros and Cons:

The wireless HDMI Product adopts an uncompressed video solution with the below advantages and disadvantages.

 

Pros

Video compression causes latency. However, uncompressed video format skips the compression step, so uncompressed video is the key for zero latency wireless HDMI solution. 

 

 

since the video is not compressed, the video quality is the same as the original video.

Which adopts more wide bandwidth which avoids interference from other mobile signals such as 3G or 4G, and WiFi. with much more stability and security.

It’s also very harder for anyone to interfere with the signals because of the Wigig short transmission distance, which provides both the much-need­ed sta­bil­ity and secu­rity.

Cons

Since 60G works in a very high frequency, the signals do not travel over distances and are absorbed by air and buildings, etc, Wigig cannot be used to break through walls. since the signal fades quickly, so you need to keep the distance between the devices. so normally the distance is around 10 meters in the clear line of sight, which is insufficient in some business applications.

Normally, it’s much expensive for uncompressed video streaming solution.

Wigig has a wide bandwidth, but it’s still not enough for 4K60 or above uncompressed videos.

What is Compressed Video?

Definition of Compressed Video:

Some HD video camera output uncompressed video, whereas others compress the video using a lossy compression method. Video compression is the process of video encoding by reducing bits of the original video to store or transmit data. some video information is removed, creating compression artifacts and reducing the resulting decompressed video quality. 

If you think of each video frame as a single image, then video compression roots out the redundant or similar ones and saves only the most important ones. Let’s assume there are two very similar frames. Compression will delete one non-essential frame from an image and use the remaining frames to create a new image. When editing video, it is preferred to work with video that has never been compressed (or was losslessly compressed) as this maintains the best possible quality, with compression performed after completion of editing.

Video compression offers several advantages, including:

  • Smaller file sizes
  • Lower storage requirements
  • Lower bandwidth requirements for transmission

Compared with the huge data of un-compression videos, compressed videos before streaming makes them capable to transmit over network bandwidth, 2.4G or 5G Wi-Fi is enough for streaming compressed video.

H.264 (AVC) and H.265 (HEVC) are widely used for video compression in encoding and digital video distribution. The main differences between H.264 and HEVC (H.265) are how they process the incoming image/audio stream and the resulting file sizes and bandwidth usage. 

 

AVC (H.264) Introduction

H.264 is a widely used industry standard for compressing, recording, and distributing digital videos, which compresses videos by using a block-based, motion-compensated-based format. Macroblocks are the basic building blocks of video compression. A macroblock consists of 16×16 pixels; these can be divided into smaller units called transform (or block) units, which can be broken down even further into smaller units called prediction (or block) units. 

The H.264 video compression algorithm can significantly lower bit rates compared to previous video compression technologies and is widely used for streaming internet videos like Vimeo, YouTube, and iTunes.

HEVC (H.265) Introduction

H.265 is the newest video compression format and is more advanced than H. 264 in several ways. H.265 (or HEVC) enables further reductions in your live video stream file sizes, which means less bandwidth is needed to transmit them. Unlike H.264, H.265 uses coding tree unit (CTU) processing instead of macroblock processing. Macroblocks can be any size from 4×4 to 16 x 16 pixels; however, CUs can handle up to 64 x 64-pixel blocks, allowing them to compress images more effectively.

Recommended Bandwidth For Video Encoding:

Resolution H.264/AVC H.265/HEVC
Bandwidth required Bandwidth required
480p 1.5 Mbps 0.75 Mbps
720p 3 Mbps 1.5 Mbps
1080p 6 Mbps 3 Mbps
4K 32 Mbps 15 Mbps

Pros and Cons:

Pros

The Wireless HDMI extender that adopted compressed video requires limited bandwidth capacity, so it can transmit with normal 2.4G or 5G WiFi, which means much longer distance and wall penetration ability. 

Unlike the uncompressed solution, which uses the constant bit rate, it’s easy to change the streaming bit rate of compressed videos to match the requirements of different application scenarios.

Normally, the wireless HDMI extender which adpoted compressed video also with lower price.

Cons

Video compression takes time, which causes latency. Normally, by adopting H.264 or H.265 compression standard, the latency will be around 100ms-150ms for wireless HDMI products. 

Because many devices around us use 2.4G or 5G WiFi, like WiFi routers, wireless mouse and keyboards, mobile phones, and IP cameras, which will make a lot of interference and cause stability and security issues.

The un-compressed video is with vision lossless video quality, while video compression shrinks files, which also impacts video quality. The actual video quality is determined by the bitrate after compression. 

Recommendation: 

Wireless HDMI extender 4K60 HDR

You may ask, Is any wireless HDMI extender in the market which combines the advantages of both uncompressed and traditional compressed video streaming solutions? with the extremely low latency, but can transmit by 2.4G or 5G Wi-Fi for long distance? 

Yes, ViewPlay has just released its newest wireless HDMI extender 4k60 HDR version which uses our latest private DSP technology and protocol that support real-time streaming with low delays, effective bit rate controls, and high reliability. with support for HDR, 4K 60p video, delivers stunning clarity and vivid colors.

End-to-end latency is as low as 15 milliseconds. It is the market’s lowest-latency and most stable wireless HD transmission solution, ideal for scenarios that require low latency, such as VR, AR, and gaming applications.

https://viewplaytek.com/wireless-4k-hdmi-transmitter-and-receiver-wlu3434/

 

wireless HDMI with no latency WMU3434

Wireless HDMI extender 4K60

ViewPlay also released the new wireless HDMI Extender 4K60 without HDR version, which adopts the latest H.265 compression standard; with our vPlay seamless protocol, compared with the previous version, we use very high bitrate and super smooth playback experiences depending on the high-performance codec engine. The streaming bitrate can reach maximum 100Mbps in H.264 compression standard and 50Mbps in H.265 compression standard, delivering a vivid video experience.

https://viewplaytek.com/wireless-hdmi-transmitter-and-receiver-wmu1212/

 

Conclusion: 

It’s important to understand uncompressed and compressed video before buying a wireless HDMI extender product because it depends on what applications you want to use.

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