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H.264. Some truth about delusions

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H.264. Some truth about delusions

This article is devoted to misconceptions, the constant distortion of facts, attempts to publicize competing compression technologies, and simply important points related to using the H.264 compression format. In video surveillance systems, of course,

Although the general trend in the world is evident, some still try to defend their point of view at the cost of correcting these same trends. Well, I respect your point of view, unless it is based on a reluctance to study the subject or is simply a PR of your own technological solution. However, the second case is no less respectable, since protecting one’s interests is always good, even for the development of the industry; in this case, the dispute helps the consumer to better understand the correctness of the choice.

So what is it really about? It is already clear about video compression in H.264 format. But we will return to the controversy surrounding its use in digital video surveillance.
Mir and H. 264
Meanwhile, the world has chosen H.264. This is not an unfounded statement. Let’s see who uses this compression format. All and various. Let’s leave the perverse proprietary reviews on the conscience of the manufacturers, as even a good idea can be spoiled by a bad implementation. Let’s see, which of the manufacturers doesn’t use it? These are mostly megapixel IP video cameras, as the performance of the processors built into them is for the most part still insufficient to compress multiple megapixels in real time. Rather inexpensive processors with the ability to compress video in H.264 to a resolution of at least 2 megapixels have just started to appear on the market (yes, the widely advertised HDTV is only 2 megapixels, multiply 1920 by 1080 yourself). What can we say about the highest resolution? For the broad masses, focusing on the medium and low price segment, it will not be available soon. But there are more than enough hardware codec chips to embed in IP cameras with a resolution of D1 (720×576): here you have DSP processors and ASIC chips, and whatever your heart desires, today it is difficult to find a standard definition camera that does not support this format. …
Again time-lapse versus inter-frame
However, there are apologists who advocate other options for video compression. In his arsenal, arguments about better compression and the suitability of formats as evidence in court. But think about it, what does the court care, with what codec is it compressed? Is the compression format important to the court and not if the witness can confirm the violation and the expert can confirm the invariability of the video? Or maybe someone will argue that video compressed with a frame-by-frame codec is harder to switch (false) than one between frames? And the frame-by-frame codec doesn’t need a digital signature at all?

Both the magazines and the Internet forums are full of debates about the suitability and professionalism of the formats, and I am tired of reading absolutely unfounded “evidence” of this or that. The hobby is the main problem, an argument based on emotions, not arguments and mathematics. Let me give you a couple of examples.

There is a gigantic error based on the unwillingness to read the standards and generally study the device of even the simplest codecs. We are talking about the H.264 format and, in general, the methods of compression between frames.

“All the frames, except me, are synthesized, since they take information from the previous ones and simply indicate where to move this section of the image to a new location. That is, as if you selected a section of the frame in Photoshop and moved it to a new location. actually there is a frame that is not valid. ”

In fact, quite the opposite. It is the blocks in IP frames that are compressed when modified, and those that have not changed (that is, there was no movement) will remain unchanged. In general, the IP frame consists only of the modified information (blocks), which means that the information in them is not repeated, but is updated, but the l-frame is completely compressed, regardless of the changes.

Also there: “The codec uses psychophysical compression, that is, part of the image, which moves, becomes rough – all the small details are removed. This is because a person does not distinguish between details in fast-moving objects So does it make sense for a film codec to waste space and traffic to get details? “

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What is the industry standard H.264 video encoding format for video compression?

The H.264 video compression standard is also known as MPEG-4 Part 10, Advanced Video Coding, MPEG-4 AVC, or AVC Video, and is an industry standard for video compression. It is one of the most popular video formats currently in use.

In our digital life, we really come into contact with H.264 everywhere and the popularity of H.264 continues to grow. You can find this codec on, for example, HD DVD, HDTV, pay TV, or YouTube videos. And H.264 is not limited to consumer electronics. This format is also increasingly penetrating corporate communications IT.

Due to the growing popularity of H.264, it is estimated that by 2025, most conventional video distribution solutions that use HDBaseT or other proprietary transmission methods will be replaced by more flexible IP-based systems.

What is H.264?

H.264 or MPEG-4 AVC (Advanced Video Coding) is a video coding format used to record and distribute Full HD video and audio. This format was developed and maintained by the ITU-T Video Coding Expert Group (VCEG) together with the ISO / IEC JTC1 Moving Picture Expert Group (MPEG).

The H.264 format, which is commonly used for recording, compressing and distributing video content, is a network-compatible video transmission method that delivers high-quality images without consuming too much bandwidth.

Encoding and decoding with H.264

H.264 works by encoding (converting) HDMI (HD) audio and video signals into an IP stream that can be transmitted over an IP network. At the other extreme, the cable box converts the signals back to an uncompressed HDMI format. H.264 is so versatile because it allows you to transmit video signals from one encoder to multiple decoders at the same time. For example, you can transmit a set of video signals to a screen, a video wall, and a digital signage system at the same time.

H.264 applications: when and where can this format be used?

The H.264 video compression format is perfect for AV distribution to one or more video sources (multicast streams for multiple displays). A particularly suitable area of application is the remote transmission of AV signals over existing cables and the Internet. It is currently in the process of moving to the standard video compression format, eg. B. for the video surveillance industry.

Applications include outdoor reporting (OB vans), energy sector, education, transportation sector, drone video recording to monitor the environment, as well as video wall processing, digital signage solutions and videoconferences.

The difference between H.265 and H.264

H.265 is the most recent variant of H.264 and is also known as High Efficiency Video Coding (HEVC) and MPEG-H Part 2. Compared to H.264, H.265 offers up to twice the compression of data with the same level of quality for video signals. It is designed to support future resolutions up to 8K UHD (8192×4320) (H.264 supports up to 4K (4092×2160)). Some newer devices, eg. Eg Some televisions, for example, have recently come with a built-in hardware decoder that plays H.265 content; however, the improved quality and reduced bandwidth usage come at a price. H.265 encoding and decoding require more processing power than H.264; therefore, the costs of H.265 solutions are significantly higher.

Benefits of using H.264 encoders and decoders

-Transmission with a low bandwidth requirement and a higher resolution.
-H.264 was developed to provide high quality transmission of full motion video with lower bandwidth requirements and lower latency than traditional video standards such as MPEG-2. H.264 uses a very efficient codec that delivers high-quality images and uses minimal bandwidth.
-H.264 bit rate is lower than other formats.
-H.264 has a bitrate 80% lower than Motion JPEG video. Estimated bit rate savings can be up to 50% compared to MPEG-2. For example, H.264 can provide better image quality with the same compression bit rate. Or the same image quality at a lower bit rate.
-Reduced video storage requirements
-H.264 requires much less storage space to store video content compared to other standards.

H.264 All about H.264

What is the H.264 video encoding format and why is it becoming the industry standard for video compression?

The H.264 video compression standard, also known as MPEG-4 Part 10, Advanced Video Coding, MPEG-4 AVC, or AVC video, is a standard for video compression currently among the most widely used formats.

H.264 affects all aspects of our digital life and its popularity continues to grow. For example, we find this codec on HD DVD, HDTV, pay TV or YouTube video. However, H.264 is not only limited to consumer electronics, but has also spread to business.

By 2025, more conventional video distribution solutions using HDBaseT or other proprietary streaming methods are forecast to be replaced by more flexible IP-based systems, given the continued growth in popularity of H.264.

What is H.264?

H.264 or MPEG-4 AVC (Advanced Video Coding) is a video encoding format that allows you to record and distribute Full HD video and audio. It was developed and maintained by the ITU-T Video Coding Expert Group (VCEG) with the ISO / IEC JTC1 (MPEG) Moving Image Expert Group.

Commonly used for recording, compression and distribution of video content, the H.264 format is a video transmission method that provides high-quality images without taking up bandwidth.

H.264 encoding and decoding

The H.264 works by encoding (converting) HDMI (HD) video and audio signals into an IP transmission that can be transmitted over an IP network. On the other hand, a decoder converts the signals into an uncompressed HDMI format. What makes H.264 so versatile is that it allows you to stream video from one encoder to multiple decoders simultaneously. For example, it is possible to transmit a set of video signals to a screen, a video wall, and a digital signage system at the same time.

H.264 applications: when and where to use?

The H.264 video compression format is perfect for AV distribution to one or more video sources (multicast broadcasts for many displays). Its use may be particularly suitable for long distance signal transmission using existing cables and infrastructure. For example, these are fast becoming the standard video compression format for the world of video surveillance. Applications can range from external transmissions (OB vans), energy sector, education, recording, transport drones for environmental monitoring, as well as Video Wall processing, digital signage solutions and video conferencing.

Comparison between H.265 and H.264

H.265, the younger brother of H.264, is a format also known as High Efficiency Video Coding (HEVC) and MPEG-H Part 2. Compared to H.264, H.265 offers duplicate data compression for the same video quality. It was designed to support future resolutions up to 8K UHD (8192×4320) compared to 4K (4092×2160) supporting H.264. Some new devices, such as televisions, are starting to provide a set-top box with built-in hardware to play H.265 content, though the superior quality and reduced bandwidth certainly come at a cost. H.265 encoding and decoding require significantly more processing power than H.264, therefore the cost of H.265 solutions remains decidedly higher.

Comparison between H.264 and MPEG-2

Compared to MPEG-2, H.264 has:

Better remote viewing quality with the same compression bit rate as MPEG-2
30-50% lower bit rate
Use up to 50 percent less bandwidth
H.264 is best suited for transmission oriented technologies
Advantages derived from the use of H.264 encoders and decoders
Higher resolution monitoring and low bandwidth usage.
H.264 was created to provide high-quality full-motion video streaming with lower bandwidth requirements and traditional video standards with less latency, such as MPEG-2. H.264 uses a highly efficient codec that provides high-quality images and uses a minimal amount of bandwidth.
H.264 bit rate is lower than other formats
H.264 has an 80% lower bit rate than JPEG Motion videos. It can be estimated that speed savings

The promise of H.264

High quality video at a low bit rate: the promise of H.264

With the growing number of video surveillance equipment manufacturers using H.264 compression technology in their digital cameras, encoders and recorders, end users hope that the technology can reduce the effects of multiple video transmissions on the network while improving vast recording capacity

Also known as MPEG-4 Part 10, the H.264 format is a codec standard for digital video, completed in 2003, which promises to compress video data at a very low bit rate while preserving video. High Quality. Today, many CCTV systems are forced to sacrifice bandwidth and expensive network storage space. However, if H.264 keeps its promise, the resources used today can stream and store more video streams with higher frame rates and better resolution.

Anixter’s Infrastructure Solutions Lab recently ran several tests to compare the differences in bandwidth usage between H.264 and MJPEG video streams to a camera that supports both compression technologies.

Result:

In tests with little or no motion, the video stream used only 10% of the bandwidth of an equivalent MJPEG video stream. During high-motion tests, the difference in network bandwidth consumption was smaller but still significant.

Results

The laboratory discovered significant differences in the use of network resources between the two compression methods. When the camera saw little or no movement, the H.264 compressed video transmission used about 10% of the network bandwidth required for an equivalent MJPEG compressed video transmission. In tests with a high degree of movement, the H.264 transmission used more bandwidth, so the difference in network resource consumption was smaller but still significant. There is the biggest potential difference in terms of network usage at high frame rates. The differences are not so great for low frame rates.

Video quality observations

Videos taken with each of the two compression methods were examined using the same cameras, lenses and displays. The qualitative evaluation of the laboratory engineers revealed a slight difference in quality between them. The laboratory estimates that the H.264 video has a quality equivalent to about 95% of that produced with MJPEG compression technology.

It has also been observed that the strobe effect of certain shaded or raster patterns could significantly increase the bit rate of the compressed H.264 video stream compared to scenes without such patterns. When these patterns took up much of the camera’s field of view, they appeared to represent a large motion area for the camera’s encoding engine, resulting in an increase in the amount of data required for image transfer. However, these extraordinary peaks did not reach the level of the resources required to transmit and store an equivalent sequence in MJPEG.

Conclusions

Video streams encoded with the H.264 compression method have significantly reduced network storage requirements compared to streams compressed in MJPEG. Even if these tests do not measure the storage space required to record these images, there is a direct link between the use of network bandwidth for compressed data transfer and the storage space required for capturing this data. For IT and security administrators, the lab recommends using H.264 compression technology to reduce the bandwidth load of network video transmissions while increasing storage space for the same amount of Live Video.

The different types of format for H.264

While H.264 is often considered a single format, there are many different types of H.264 formats. Each of these different types of formats has performance advantages and disadvantages. In recent years, most IP camera manufacturers have supported only the most basic type of format – the basic line profile. Now, manufacturers are increasingly supporting the more ‘advanced’ format types, including high profile and main. In this article, we share the results of the baseline profile tests against the largest profile differences in bandwidth and hardware (CPU) usage.

H.264 background

Manufacturers of IP cameras have widely standardized H.264 codec as the selected video surveillance codec. Because virtually all video surveillance systems need compression, codecs are indispensable. Previously, MJPEG and MPEG-4 were the most widely used. Today, the most widely used is H.264. In the last few years there has been a hot debate over the use of MJPEG or H.264, but H.264 certainly offers very interesting bandwidth savings.

Basic vs. Main line H.264 profile

Of the many H.264 profiles, the two most commonly used for video surveillance are the basic and main line. The baseline profile is generally considered the least effective of the H.264 profiles, but also the least demanding in terms of hardware resources. In contrast, the main profile is considered effective in bandwidth consumption, but also more demanding.
Increasingly, newer IP cameras use the main profile by default, while the generation 2-3 years ago would be more likely to use the basic profile.

Questions to be solved with the tests with h.264

IPVM performed a test in 3 different scenarios – during the day, at night and in high traffic complexity. For measuring the differences in bandwidth usage and hardware utilization (CPU) for base and main line H.264 profiles.

The questions they asked were the following:

How much bandwidth savings, if any, would you have with the main profile compared to the baseline?
How much bandwidth savings would you have depending on the stage type?
What is the increase in hardware consumption (CPU) when using the main profile instead of the basic line profile?
Should we prefer a main profile camera rather than a basic line profile camera?
Main conclusions and answers
The bandwidth limitation is modest. The main profile reduced bandwidth consumption by 10-30% in all three tests.

In all three tests, no noticeable difference in hardware consumption (CPU) was observed between the base profile and the main profile.

The tests were also performed using MJPEG. Bandwidth usage was 10 to 100 times more than the main profile.
Furthermore, it was also very interesting that the hardware consumption (CPU) was generally significantly higher than any of the H.264 sequences.

H.264 explained – Mp4 format

Video formats for the Internet: MP4 and its variants, MP4 / H.264 and MP4 / MPEG-4 – Differences and similarities

The videos that we play online or locally on the computer or any other device may be coded in different ways. Each method of encoding them has its advantages and disadvantages, and there are better formats than others, depending on the use we will give to the video. We have formats such as AVI, MP4, MKV, 3GP, Google WebM, etc. …

When playing video on the Internet using a browser, the most widespread format and with the best support from browsers, both mobile and desktop, is the MP4 format, and to be more accurate the MP4 / H format. .264, which corresponds to files that normally carry the .mp4 extension. but:

Are all .mp4 files the same?

If they are not similar, what types are there? What are the differences, advantages and disadvantages of each one?
Are they all on the Internet?

MP4 format – Parts, containers and extensions

When we talk about a .mp4 file or MP4 format in general, what we are talking about is what is technically called MPEG-4, part 14. It is a standard format (ISO / IEC 14496-14) and it is a container format for multimedia tracks. That is, this format defines how audio and video tracks (called data streams) can be contained in the file in various formats and may even contain subtitles.

In this container format within the .mp4 file, the audio and video tracks can be encoded in different formats, as appropriate for the application to be provided. While in theory it supports many different formats (almost any) for these audio and video tracks, in practice players of this format only support some specific types, the most frequent being:

Audio: AAC (Advanced Audio Codec, which when released is files with extensions .m4a or .3gp) or MP3 format.
Video: the different variants of MPEG format.
MPEG or Moving Picture Experts Group is a group of “authorities” and audio and video manufacturers that came together at the request of ISO in the late 1980s to create file coding standards for this type of multimedia information, ensuring compatibility between the media to be played, and the playback devices. The first version of the standard, MPEG-1, came out in 1993, and since then there have been many new versions, and within what they call “Parts”, which are specific aspects of the standard and also extensions to the specification of specific things, or improvements to the basic format they are changing.

The most prevalent version of this MPEG format is 4 or MPEG-4, which appeared in late 1998, and this is what we know as MP4, due to the expansion of its files. This version is divided into several sub-standards or “Parts” that describe certain format issues (such as the 14 container, as I said at the beginning) and some extensions.

Within parts of the standard, part 10 describes an advanced coding format, that’s what we also know as H.264, but it’s actually also called MPEG-4 part 10, and that’s what Blue-Ray discs used for example. That is why they talk on many internet sites that the H.264 and MPEG-4 are the same. And this is true, but not quite, as parts 2, 12 or 14 of MPEG-4 also describe other compression formats that are MPEG-4, and the container format may also contain MPEG in earlier versions of lower quality such as MPEG -1 or MPEG- 2nd

MPEG-4 part 10 or H.264 or AVC format

Let’s summarize what we know so far: When we talk about MP4 or .mp4 files today, or the “MP4 format”, we’re really talking about the container format. Within this, there may be audio and video in various formats, so only talking about MP4 is not correct (or at least it is not accurate) and more details are needed. Given that the format used to compress the video stream containing MP4 is of vital importance, “last name” for that format is usually set to indicate well what we are referring to.

Thus, reference is made to MP4 / H.264 for videos using MPEG-4 part 10 and which are very high quality compatible videos. It is also common to talk about the MP4 / MPEG-4 format, which in this case usually refers to part 2 of the MPEG-4, which is the original format that was released and is of lower quality so it is usually used for broadcasting IP TV (video surveillance) or distributing certain multimedia content (some “pirate” movies, multimedia CDs …) as it generally weighs less.

The MP4 / H.264 format is what should be used to play directly in browsers, as this is what everyone supports today in all operating systems. It is much more efficient than MPEG-4 part 2 (the original) in coding and offers much better quality, even if we use a low bit rate or reduced bandwidth when reproducing it. It resists transmission failure very well, although some packets are lost, so it works very well for streaming, video conferencing and similar applications. This format is also called AVC (Advanced Video Coding), so sometimes you can read MP4 / AVC, but it’s the same.

By contrast, the H.264 format is more complex and more complicated to code (it may require up to 3 times more computing power than the original MPEG-4 format) and to decode (twice as much power), but today with the devices that the average user has (both computers and mobiles, etc.), this is of little importance.

In summary

Just talking about the “MP4 format” is imprecise. One video with the .mp4 extension may not play in one browser, while another with the same extension does. The difference between them is in the way of encoding the video inside, as .mp4 is a container format.

On the web, the recommended format is MPEG-4 part 10, or what is the same as MP4 / AVC or, much more commonly called, MP4 / H.264. This format works in all browsers on the market, except in very old versions of Internet Explorer.

So when they talk to you about the “MP4 format”, they either talk about MP4 / H.264 or they have to specify it more. If you are unsure about the format of a particular .mp4 file you want to play, you can use a tool like Media Info to tell you how the audio and video tracks are encoded. This program identifies tracks coded as H.264 as AVC, which as we know is the same. If AVC tells you, it’s in the right format for the Internet.

As you can see, the world of multimedia formats is quite complicated technically. Fortunately, as a developer or web designer, all you have to worry about today is that they have an appropriate quality / weight ratio and are coded as MP4 / H.264. So you have it easy

Why is H264 a high quality video standard?

Let’s say you have a very good technology that allows you to have a high quality video using a small bit rate allowing high quality video to be offered to a wide variety of devices, from low-performance mobile phones to Blu-ray devices equipped with Maximum performance

In summary, the H264 is suitable for any platform, from handheld devices to high definition material.

The H264 standard reduces the amount of information needed to play a video.

Its compression system that I explain roughly so that it can be better understood in the video The best codec for editing videos makes you get a more compressed file and that does it along with its versatility of playback on different devices that is the preferred codec to export the final result of our edition.

It’s time for H.264.

Learn how to choose the right coding tool and optimize H.264 encoding for ideal quality and device compatibility

H.264 It is the only compression technology that plays on all computers, mobile devices, and OTT players. This makes producing high quality H.264 files compatible with your devices an essential skill. Helping you acquire and / or polish these skills is the objective of this article.
Well, we will start with the compatibility issue, because if the file cannot be played on the device that is needed, its quality does not really matter much. Then, we will see, the resolution, frame rate and data rate of your encoded file, since if these are wrong, using the H.264 encoding parameters will not matter either. So we will cover how to choose the correct coding tool and the H.264 codec and how to quickly adjust the x264 encoding parameters for optimal quality in the file.

Are you one of those who have hundreds of movies on the hard drive? Convert them to H.265 to save (much) space

Now that the H.265 format has been seated for a while and more and more devices are able to decode it, it is time for you to convert your movies to save hard disk space. A video in H.265 format measures up to 50% less than in H.264, while retaining the same quality.

What is H.265?

Also known as HEVC (“high efficiency video coding”), it is a video compression standard published in 2013 that improves its predecessor in several aspects, the H.264 / AVC format, whose first version was published in 2003. H.265 offers higher image quality at smaller bit rates, which means that files take up less space. It also supports 8K UHD resolution.

How does it benefit me? If you have an iPhone, you may already be using H.265. Apple introduced it in iOS 11 to reduce the size of videos, but only when they are stored on the phone (if you share them, they are converted to a more compatible format). You can also use it to save some space on your computer or multimedia server.

Imagine you have a movie on your hard drive that comes from a Blu-ray. The movie has been encoded in H.264 format and measures 12 GB. If you convert it to H.265 with a video encoder program (or video encoder, in English), the movie will measure between 6 and 9 GB. As simple as that.

Does H.265 have disadvantages?

Yes. First, compatibility. Only modern devices are capable of decoding H.265, so don’t bother if you have a TV or multimedia device that doesn’t support the format. Players like Plex transcode the movie in real time if your device is not compatible (that is, they convert H.265 to H.264 while watching the movie), which consumes a lot of energy and resources.

It is very hard for machines to code H.265, so you need a powerful CPU or GPU to do it faster (the good thing is that you only have to do it once). But it’s also hard to decode it, so a cheap NAS or player won’t be able to do it. H.265 gets along with old gadgets.

One last consideration: it is not clear that H.265 is the future. Large platforms such as YouTube and Netflix are bidding for another more compatible format called AV1 just because they don’t want to pay the H.265 license.

In any case, H.265 is the present. If you want or need to save gigabytes on your hard drive, you have the solution a few clicks away.