H.264 vs H.265: Which is the Better Choice?

[00:00] hi everyone welcome back to our Channel

[00:02] this is Frank from YOLO live in our last

[00:04] video we discussed three encoding

[00:06] methods vbr CBR and CQ and we also

[00:10] touched on the concepts of h264 and

[00:14] h265 it is well known that yolobox

[00:16] supports the h264 encoding format

[00:20] Additionally the ultra model also

[00:22] supports the h265 encoding format so in

[00:26] this video we'll dive deeper into the

[00:28] video encoding formats h264 and

[00:32] h265 to help you gain a more

[00:34] comprehensive understanding of the

[00:36] visual parameters that affect video

[00:38] compression

[00:42] quality a video file comprises three

[00:45] layers container codec and raw data

[00:48] encoding compresses data to control the

[00:51] final file size each video consists of

[00:54] frames size based on their raw data

[00:57] format usually a color space model

[01:00] actual video files are smaller due to

[01:02] compression during encoding dictated by

[01:05] the codec format which uses specific

[01:08] compression and decompression algorithms

[01:11] compatibility with the codec is

[01:12] essential unsupported formats won't play

[01:15] on certain players encoding primarily

[01:18] affects file size through parameters

[01:20] like bit rate and maximum bit rate often

[01:22] resulting in lossy compression that

[01:24] impacts quality resolution and frame

[01:27] rate adjustments occur during

[01:28] transcoding which manipulates raw Frame

[01:31] data by recalculating time stamps and

[01:33] discarding extra

[01:37] frames h264 is the most commonly used

[01:41] video Codec but it is designed to handle

[01:43] images and cannot process audio data the

[01:46] compression mechanism of h264 is quite

[01:49] typical incorporating Concepts like

[01:52] motion compensation and motion

[01:54] estimation this allows the codec to

[01:56] reduce the overall file size by

[01:59] calculating the current image based on

[02:01] previous or surrounding images instead

[02:03] of recording all the data for a highly

[02:06] similar sequence while understanding the

[02:08] specific compression algorithms isn't

[02:10] necessary it's important to be familiar

[02:13] with certain h264 specific Concepts

[02:16] iframes P frames and B frames an if

[02:20] frame or intraframe is a standalone

[02:23] image frame that can be displayed

[02:24] independently and contains the most data

[02:27] a p frame or predicted frame is computed

[02:30] from the previous iframe or P frame so

[02:32] its data is incomplete and smaller in

[02:35] size compared to an iframe most frames

[02:37] in a video are P frames a b frame or by

[02:41] predictive frame is calculated based on

[02:43] both the preceding and succeeding I

[02:45] frames or P frames making it the most

[02:48] data efficient and smallest frame GOP or

[02:51] group of pictures refers to a complete

[02:53] set of video frames for instance if the

[02:56] GOP is set to 25 the encoder will ensure

[02:59] that the first frame of every 25 frames

[03:02] is an iframe if the frame rate is also

[03:05] 25 FPS then the first frame of each

[03:07] second will be an

[03:12] iframe why is it useful to understand

[03:15] these h264 Concepts in live streaming

[03:18] these Concepts become more significant

[03:21] since iframes are independent frames the

[03:23] playback of B frames and P frames relies

[03:26] on iframes therefore streaming servers

[03:29] must Dash iframes to help reduce initial

[03:31] screen Distortion however localized

[03:34] distortions may still occur to mitigate

[03:37] this the GOP setting is crucial

[03:40] typically the GOP is set to one to two

[03:43] times the frame rate ensuring an if

[03:45] frame every 1 to two seconds this setup

[03:48] means that screen Distortion

[03:49] theoretically only occurs if streaming

[03:52] starts within this one to two second

[03:54] window given that frames are generally

[03:56] similar within this interval and with

[03:58] iframe caching even localized

[04:00] distortions often go unnoticed moreover

[04:03] for live streaming it is usually

[04:05] recommended to disable B frames although

[04:08] B frames have the smallest data size

[04:11] they depend on subsequent frames for

[04:13] decoding thus disabling B frames helps

[04:16] ensure a smoother live streaming

[04:18] experience the iframe interval and

[04:20] maximum bframe settings on the YOLO box

[04:23] are fixed by default if you are not

[04:25] satisfied with the YOLO Box's parameter

[04:27] settings and need to insert iframes more

[04:30] frequently you will need to learn how to

[04:32] use custom ffmp

[04:38] output in recent years h265 has steadily

[04:42] gained popularity compared to h264 files

[04:46] compressed with h265 under the same

[04:48] conditions are often smaller for example

[04:51] if I record a 9-second video on my ultra

[04:54] both set to 4K 30fps with the same

[04:57] network the file size is 14 .22 medaris

[05:01] with h264 en coding however with h265

[05:05] encoding the file size is only 12.63 M

[05:09] there's also a unique situation where if

[05:12] your network bandwidth can only support

[05:14] lower resolution and FPS settings you

[05:16] can choose h265 encoding to maintain the

[05:19] best possible video quality to elaborate

[05:22] at 4K 30fps the difference in quality

[05:26] between h264 and h265 May hard to notice

[05:30] with the naked eye however at 720p or

[05:33] 480p settings the final video quality

[05:37] difference between the two codecs is

[05:39] quite significant additionally h265

[05:42] conserves bandwidth while maintaining

[05:44] video quality but it requires more

[05:47] computational power for encoding and

[05:49] decoding in other words playing h265

[05:53] videos demands more processing power

[05:55] than

[05:56] h264 this is the key difference h26 5

[06:00] offers a higher compression ratio but at

[06:02] the expense of increased performance

[06:04] requirements however a crucial point to

[06:07] consider is that h265 is not as widely

[06:10] supported as one might assume some

[06:12] streaming platforms such as Facebook and

[06:14] twitch do not support

[06:16] h265 therefore even if you opt for

[06:19] h265 it won't be feasible if the client

[06:22] lacks support this is why h264 remains

[06:25] more commonly used as it ensures

[06:28] compatibility across all almost all

[06:30] platforms furthermore because h265

[06:33] achieves greater compression software

[06:35] decoding tends to be slower for some

[06:38] older computers playing High bit rate

[06:40] h265 videos can be very choppy support

[06:44] for h265 in widely used editing software

[06:48] is still improving therefore if you plan

[06:50] to import videos from yolobox for

[06:52] editing on your computer I still

[06:54] recommend using h264 encoding for now

[06:57] unless h265 encoding significantly

[07:00] enhances video quality I personally have

[07:03] high hopes for the development of

[07:05] h265 in the future as Premiere and Final

[07:08] Cuts support for it becomes more

[07:10] comprehensive and more software and

[07:13] devices begin to adapt to

[07:15] h265 this encoding format which balances

[07:18] high quality with small file sizes will

[07:21] undoubtedly replace h264 in the visible

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[07:59] 89 see you in the next video