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[Home Theater Network HDAV.com.cn] After reading this article, everyone asks if they are innocent or ignorant!
In the digital streaming era, I believe that most people have forgotten the existence of Blu-ray storage media. In fact, Blu-ray has always been the best quality video source we can buy and see in the consumer class. This has never changed. Over. Compared to the so-called "SD, HD, and ultra-clear" various definition options of network video, it is possible to purchase 1080p resolution when purchasing members. So, is the online video 1080p quality and Blu-ray 1080p the same thing?
Blu-ray quality is purely pulled? Network video 1080p picture quality measured
For high-definition enthusiasts who are “intelligibleâ€, the so-called 720p and 1080p of online video are all “fraudâ€, but also “disdain†to study how much the real HD image quality gap is, because they understand that resolution is only a measure of painting. One of the qualitative indicators, just one indicator is not enough to talk about the quality of the picture. Later, we will specifically target the "same resolution image quality test", then the resolution will not need to be discussed.
"Bourne 5" Blu-ray original disk - for the online version of "Bour Shadow 5" is a great test
Tencent/Iqiyi VIP watch "Bourne Shadow 5" must be paid separately (already paid in Tencent)
Combined with the previous tests, we found in the surprise of this test that with the increasing popularity of high-speed network bandwidth, the quality of the images provided by major online video sites is getting higher and higher. Interestingly, the test also found that the difference between orthodox Blu-ray and network video is not just as simple as the difference in image quality. I believe that if you look at the complete test article, you will definitely respect the quality of Blu-ray, requiring even higher users. It is possible to give up online video and invest in the embrace of Blu-ray.
â— Blu-ray showdown: Tencent video performance exceeded expectations
At present, Tencent Video and iQiyi, which are most popular among netizens, provide "Bourne Shadow 5" network video. After comparing and comparing the free trials, I decided to purchase the Tencent video version for comparison. Interestingly, Tencent video defines the highest definition as "Blu-ray", while iQiyi is defined as "Blu-ray 1080p". When most people ignore Blu-ray, these mainstream video sites have labeled their highest definition as " Blu-ray."
"Bourne 5" Blu-ray original information - 45.32GB and 43.00Mbps video stream
First of all, let's take a look at the Blu-ray version of the video source information officially released by "Bourne Shadow 5". This 2016 super block is almost full of Blu-ray 50GB disc capacity, and the Blu-ray original capacity is up to 45.32GB (the first red frame) ), the encoded video bit rate is up to 43Mbps (the second red box), which is very scary data, to know that the high-definition of the online video stream is only about 5Mbps. Actually look at the comparison results...
The Blu-ray version of the picture is more pure (the online video picture ratio does not match the Blu-ray standard)
It is very difficult to fully express the difference between the Blu-ray 1080p and the network video 1080p in a contrast picture with a width of 640 pixels. In other words, the larger the size of the TV, the greater the difference between the two can be more essentially distinguished. . In this set of comparisons, the Blu-ray version of the picture is more pure, while the online video version is somewhat noisy, which is why the bit rate is not high enough. In addition, the proportion of the screen of Tencent Video Online is different from that of the original Blu-ray. After comparing the author, it is confirmed that the face of the online video version of the heroine is weakly stretched.
Online video default brightness is higher than standard Blu-ray
In this set of comparison pictures, you can see that the style of the same frame is different. The official Blu-ray release can restore the artistic concept that the director wants to convey. The texture of the paper and the texture of the folds are very clear. The online video version deliberately increases the brightness of the video, but the paper looks far less true than the real Blu-ray version, and the wrinkles on the paper are much weaker and look a bit fake.
Online video and video resolution is "unstable"
From the screen, it is easy to feel that this set of contrast is also brighter online video, but the metal texture of the USB flash drive and the English handwriting on the USB flash drive, obviously the official Blu-ray version is even better. In addition, the picture of the native Blu-ray video is obviously more able to restore the director's intention in terms of the feeling of the whole picture. More importantly, the actual screen resolution of the "Bourne 5" Blu-ray release is 1920×804 from beginning to end, while the first half of the online video is 1920×816, and the middle and the second half becomes 1920×. 800, the picture ratio is faulty.
â— Native Blu-ray vs. online "Blu-ray" video contrast experience
"Bourne 5" pure Blu-ray release and online video 1080p version of the comparison results needless to say, Blu-ray release is a high-end symbol, the real audio-visual enthusiasts pursue the goal, representing the highest level of video in the current consumer market Clearness, the quality of online video, of course, there is a clear gap. Interestingly, what we see is not just the difference in image quality. Compared to the pure Blu-ray release, the online video version has the ability to brighten the video source, and the proportion of the picture is not stable enough.
In fact, in the case of non-contrast, the mainstream Blu-ray resolution of Tencent video is “very adequate†for mainstream users with low video resolution requirements. This is why we finally chose to compare with Tencent video sources. Perhaps most users don't care about such differences and essences, and the author is only responsible for telling the readers the nature of things.
â— Advanced test: Why 1080p quality is not as good as 720p
Online video advertised standard definition, high definition, ultra clear, 1080p, 4K is actually a very vague statement, for example, the HD standard is 1280×720, but in fact the video resolution of online video HD is only 720×480, really To achieve the 720p HD standard, you need to clear this level. In fact, most users are concerned about the resolution (resolution) of the video source, and never care about the more important factor of video quality - the stream.
An overview of the video information downloaded by Youku client (online video can't be compressed, the picture quality is greatly reduced)
The concept of Full HD 1080p and Ultra HD 4K is so popular that people think that a video with a resolution of 1080p represents 1080p resolution video, which is actually not rigorous. Readers with video coding experience should be aware that compressed video is usually used to confirm the compression rate of video. Due to the relationship between network video transmission, the bit rate is usually low, which allows users to watch videos more smoothly. Limited by the relationship of the domestic network environment.
Why is the 1080p picture quality far less than 720p?
In fact, a 1080p video quality with a low bit rate compression is far less than a high-rate 720p video quality. The code rate represents the image information contained in each frame. The low-rate video information is too small, and the detail loss is huge. , greatly affecting the quality of the image. Conversely, even with 720p HD video, the video encoding is set to a sufficiently high bit rate parameter, and the performance of the picture can be done quite well.
â— Online video VIP 1080p image quality is not as good as local 720p
First of all, network video providers must hope that viewers will see higher quality video content, but limited by the domestic network environment, video resources have to be "brutal" compression, which greatly reduces the clarity of image quality. The content of the locally downloaded video is more about local playback, and does not depend on the network. Therefore, the high-level parameters of the video are relatively rich, and the image quality is also better.
â— 1080p rate test and final summary
The video bit rate and code rate mentioned above can be understood as the information content contained in each frame of the video picture. The higher the rate parameter, the richer the image information, and vice versa. In order to verify the intuitive impact of the bit rate on the picture quality, the author invites friends in the video industry to help, extract blue-ray original lossless information, high-rate 1080p and low-rate 1080p three-part video, let's take a look.
The measured test proves that the same resolution - video bit rate has a great impact on the quality of the picture quality
Information about the Blu-ray Dispatch 5 Blu-ray release has been identified in the previous section with a small red frame. The native blue video has a bit rate of 43 Mbps, reducing its video bit rate from 43 Mbps to 17.7 Mbps, which is very good on a 55-inch TV. It is easy to see the difference (the compressed video is a little darker). In the words of the video industry friends, it is generally necessary to have a projection of 100 to 120 inches or more to see the difference in image quality. However, if Blu-ray video is compressed from 43Mbps to 6.2Mbps, the picture quality difference is larger than expected. First of all, the clarity of the picture is essentially different (note that Matt Damon's hair is clearly visible and ambiguous. ).
â— Final summary - online video talk about quality
Obviously, readers who know a little bit know that online video is compressed and suitable for mainstream users who are not critical to image quality. Unfortunately, the users who buy 4K Ultra HD TVs today are just such a group. However, the reality is cruel. As a TV media person and a quasi-HD enthusiast, the author can be very responsible to say to everyone: Even if the video site VIP exclusive 1080p video quality, the picture quality is really not as good as the local 720p HD video. .
The words are not rough: 4K TV has no meaning for mainstream users
The last question, mainstream users buy 4K ultra-high-definition TV and watch video programs in the most mainstream way. The actual video quality that can be viewed is not even high-definition 720p standard (including various VIP 1080p online videos). So what is the significance of 4K TV? Many people think that the popularity of 4K ultra-high-definition TV means that the Blu-ray 1080p standard is about to be eliminated. However, in reality, we are still far away from the Blu-ray 1080p picture quality standard. It’s nice to say that mainstream users are passive and innocent, and it’s hard to hear that is ignorance.
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