If you like watching movies, you must be familiar with the 1080 p, AAC, and x264 terms. So what information does they contain? Let's take a look at "depth.
Let's talk about 360 P, 480 P, 720 p, and 1080 p.
When I see this, the otaku in front of the screen will say, I only know 3 P, there are 1080 p?
Actually, here P indicates a progressive scan. 720 p means a 720-line scan, and 1080 p means a 1080-line scan. The larger the number, the higher the resolution.
You can see the data in the next group. (Underline)
Let's talk about the format.
Any file has a specific format. For video files, MP4, MKV, and rmvb are common video formats.
Does the difference in format mean the quality of the video?
MP4 format is used to deal with mobile phones, tablets and other handheld devices playing, this format represents that it uses the MPEG-4 video compression encoding, but the specific encoding format is not determined, it is generally DivX or XviD. Since all the famous flowers are hand-held devices, computer and TV users should not be robbed. It is also a cow dung inserted into the flowers.
All the children's shoes that have downloaded movies know that these movies are usually equipped with ultra-HD movies such as 720 p and 1080 p, and despise the silk in formats such as rmvb and MP4. In fact, it is a new multimedia Encapsulation Format called matroska. The true advantages of MKV are not in their image quality. MKV can be integrated into a single file with multiple audio tracks and Subtitle tracks of different types, and its video coding degree of freedom is also very high, it can be common DivX, Xvid, 3ivx, or even realvideo, QuickTime, and WMV streaming videos.
MoV is the QuickTime video format. It is an audio and video file format developed by Apple. It is used to store common digital media types, such as audio and video. When QuickTime (*. mov) is selected as the "Save type", the animation is saved as a. mov file. Nowadays, mov format is often used to create HD movie trailers, which can reach the so-called Full HD standard of P.
Like mov, m4v is also a standard video file format developed by Apple, which is used by iPod, iPhone, and PlayStation portable, second edition based on MPEG-4 coding.
The advantage of this format is that it does not have high hardware requirements. Even 1080 p movies can be played easily on home computers over the past two years. It is also the only supported format for most set-top boxes, but the disadvantage is also obvious-the huge file size is usually 30 or 40 GB.
Rmvb (RealMedia variable bitrate) is a dynamic bit rate extension of RealMedia multimedia encapsulation format developed by RealNetworks. Rmvb uses many MPEG-4 Part 10 codecs, such as H.264 compression technology. This format is mainly used to deliver films in Asia, especially animated and Chinese TV series.
In addition, the popular AVI format has long been an old technology, but it is still widely used due to its versatility and easy-to-understand API development. It adopts a Lossy Compression Method for video files, but the compression is relatively high. Therefore, although the quality of all aspects is not very good, it has also received the favor of many netizens who are online.
This indicates the version.
Friends who like to watch videos online should have met some playing stations who want you to choose the playback version, ts, DVD, BD, and so on. However, according to my experience, most of the playback stations that you want to select are the garbage stations that need to install a specific audio or video.
This is what we call the gun version. Most of our users use their mobile phones to record it from the cinema. During this period, the audience laughed and shouted, the shadows moved around, and the camera suddenly moved down. Take a live movie theater and remember it. However, some professional replaying comrades will use cameras, tripod, and picture quality. Compared with mobile phone replaying, this is just a place in the sky, but it is still inevitable.
The ts here is not the video format mentioned above, but a video version. To put it bluntly, ts is an upgraded version of the gun version, which is recorded in an empty cinema or projection room. The image quality is clearer than Cam, but the audio source is inevitably noisy, and even some Ts audio Sources come from Cam.
TC uses a television and film machine to directly copy numbers from the film. The image quality is good, but the brightness is not enough and it is a bit dim. Most of the time, the TC Sound Source is from ts, so the sound quality is poor, but the picture quality is far better than TS. If not, TC is a good choice.
Dvdscr refers to an informal version. Generally obtained from the preview version of the DVD, through the MPEG-4 Technology for high-quality compression video format. It is earlier than DVDRip, but the picture quality is slightly poor. (There are often some messages that do not scroll in the bottom of the screen, including copyright and anti-piracy phone numbers, which may affect viewing .) If there is no strict division, the image quality should be similar to that of the TC version.
It is converted from the final version of the DVD. The quality should be very good. Remove the video, audio, and subtitle from the DVD, compress the video, or compress the video, or compress it into a multimedia file. Generally, DVDRip consists of AVI and Subtitle files.
Compared with DVDRip, The HR-HDTV adopts the MPEG4 compression technology such as DivX/Xvid/x264 to compress the video image with high quality, and then encapsulates the video and audio into one. avi or. the video format formed by adding the external subtitle file to the MKV file. The image quality is higher.
Hdrip = HD-DVD rip, that is, HD-DVD HD conversion, the effect is better than general HD conversion.
BDRip = blue-ray Disc rip, that is, Blu-ray HD conversion, the effect is better than hdrip.
To be honest, I have never seen a video of this version, but I 'd like to mention it. R5 is generally in the Russian version 5, because North American blockbusters are often dubbed Russian in the Russian language, therefore, the English original audio of TS with R5 video + gun version will appear on the network = the merged version (so the sound effect is poor). Of course, there are often R5 without sound effects, in the case of a merged version, the sound effect will be specified during release.
At last we talked about the video compression encoding format.
Are you dizzy when you see the Xvid, x264, and MPEG4 that you just mentioned?
MPEG (Moving Picture Experts Group) refers to a "dynamic image Expert Group" organization that studies video and audio encoding standards. Today, it refers to a series of formal review procedures for video encoding standards developed by this group.
The following video-related standards have been developed and are currently being developed for MPEG:
We have a rough understanding of the MPEG standard. Below are some common video compression formats:
The most commonly used MPEG-4 video compression encoding format, we download a lot of movies based on this encoding.
X264 is a free, better algorithm of H.264/MPEG-4 AVC Video compression encoding format. It is an open source project like Xvid, but x264 adopts the H.264 standard, while Xvid adopts the early standard of MPEG-4. Because H. 264 is the latest video encoding standard officially released in 2003. Therefore, the video files compressed by x264 are smaller than the files compressed by Xvid in the same quality, or, it can be said that the file quality is better under the same volume than that compressed by XviD.
Audio tracks
The common ones are Ac3, dd5.1, and DTs.
Dolby sound is collectively referred to as AC3 (Audio Coding 3), which is synonymous with Dolby Digital. Dolby Digital is an advanced audio compression technology, it can encode up to six individual channels with a bit rate of up to 448 kbps. AC3 5.1 = dd5.1.
Dd5.1 is Dolby 5.1. It uses five speakers and one subwoofer speaker to play music in an immersive way. Generally, this audio track is used only for HD videos.
Recognized as the strongest sound track, the digital cinema surround sound system developed by DTs and global film company in the United States. Similar to Dolby numbers, it is also a type of multi-channel compression code technology. Data transmission adopts the CAC (coherent acoustic coding) structure compression method different from the Dolby Digital Compression method. The typical compression ratio is, which is only 1/4 of the Dolby number, and the original signal is less lost, the rich serial numbers in the original sound field can be retained. The sampling frequency of DTS's 96 kHz is twice the ratio of 48 khz, and the highest bit is 24bit.
Subtitle group/suppression Group
Large movies and TV series outside China are generally made by the subtitle group/suppression group, and the short name of the subtitle group is provided at the end of the file name.
Coincidentally, I am downloading a movie. This is the file name.
Midnight Paris Midnight.in.Paris.2011.BluRay.720p.x264.AC3-WOFEI.mkv
We can draw the following conclusions:
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