H.264 Part 1: Encoding & Decoding Basics

[00:00] [Music]

[00:12] in this video we'll explore h.264

[00:16] encoding and decoding all made possible

[00:18] by a single matrox Mira ipx 4K capture

[00:21] and IP encode decode card because h.264

[00:25] both encodes and decodes content it is

[00:28] referred to as a codec an algorithm

[00:31] which packages and unpackaged content

[00:34] for further streaming or recording

[00:37] encoding is another term for compression

[00:39] which reduces the size of a file making

[00:42] it easier to transmit over a distance

[00:45] and or to be disseminated to multiple

[00:48] endpoints or nodes as part of a network

[00:51] decoding on the other hand reverses this

[00:54] process and decompresses the

[00:58] content h.264 4 is just one of many

[01:00] codecs designed to package together

[01:03] content for the purpose of streaming or

[01:05] recording also known as EG 4 AVC it is

[01:08] the most universally deployed codec in

[01:11] use today as a result of this h.264 is

[01:14] the optimal codec choice right now

[01:17] different levels of h.264 encoding and

[01:20] decoding are available with the highest

[01:23] level being

[01:25] 5.2 h.264 predicts the makeup of frames

[01:29] comprising the con content assessing

[01:31] information or areas that require more

[01:33] or less compression for example during a

[01:37] video of a press conference a relatively

[01:39] stationary subject stands between a

[01:42] Podium and a backdrop both of which are

[01:45] even more static h.264 deduces which

[01:48] areas will not change from frame to

[01:49] frame and acts to compress accordingly

[01:53] it does this more efficiently than other

[01:55] codecs would in its place h.264

[01:59] effectively balance bces a tight RPP

[02:01] between visual quality and file size for

[02:04] costeffective bit rate management as a

[02:06] result bandwidth consumption is reduced

[02:09] when Distributing and recording content

[02:12] and the amount of space when storing it

[02:14] as a result it all costs less bit rate

[02:18] is defined as the amount of data encoded

[02:21] per second the higher the bit rate the

[02:23] higher the quality of the video because

[02:26] more data is transmitted at a higher bit

[02:28] rate it ALS also means a higher cost as

[02:31] well for example take two videos that

[02:34] are showing exactly the same content one

[02:37] has a resolution of 1080P and the other

[02:40] is a larger 4K video both can be

[02:44] streamed at the same bit rate however

[02:46] the 4K content will require more

[02:48] compression to accomplish this and look

[02:51] worse as a result in order to maintain

[02:54] the same quality for the 4K video the

[02:56] bit rate will have to increase similarly

[02:59] image quality shares an inverse

[03:01] relationship with frame rate the higher

[03:03] the frame rate the more data there is to

[03:06] encode with a 60 HZ video possessing

[03:09] twice the number of frames per second as

[03:12] a 30 HZ

[03:13] clip when there are more frames there's

[03:16] more data to encode for example in high

[03:19] frequency content like live sports

[03:22] higher frame rates are required for the

[03:24] video to be watchable and in turn higher

[03:27] bit rates are needed to transmit this

[03:30] video meanwhile bit rate control can be

[03:32] described as either constant or variable

[03:35] bit rates can either maintain a constant

[03:37] flow of data for consistent quality or

[03:40] have the codec determine how much

[03:42] compression is needed for each frame for

[03:45] greater efficiency remember the example

[03:47] of the press conference imagine that as

[03:49] one scene in a longer video and one

[03:52] which could employ a fair amount of

[03:54] compression in contrast a car chase

[03:57] scene with multiple camera angles and

[03:59] constantly changing motion would involve

[04:02] far more unique frames and therefore be

[04:05] less able to employ compression the

[04:08] highly efficient h.264 codec is in part

[04:12] what separates matrox mura ipx cards

[04:15] from the competition able to record and

[04:18] stream highquality h.264 encoded video

[04:21] to any device with h.264 decoding

[04:24] capabilities over IP at low bit rates

[04:28] Mira ipx creates Network enabled video

[04:30] walls with a single addin

[04:34] card to learn more about mura ipx

[04:37] features and how they relate to

[04:39] h.264 view the second part of this video

[04:42] or visit mat.com

[04:44] graphics /a ipx