#H.264 vs H.265 Video Encoding: Technical Differences and Selection Suggestions, Don't Fall into Compatibility Pitfalls for Saving Bandwidth
>Industry Science Popularization | Approximately 1100 Words
A cold knowledge: For the same 4K video, using H.265 encoding can reduce the file size by half compared to H.264, but the prerequisite is that your playback device "knows" H.265. If the device does not support it, the screen will go black directly - this pitfall is exploited by many projects every year.
H. 264 and H.265 are currently the two most mainstream video encoding standards. Choosing the wrong encoding scheme can result in wastage of bandwidth and storage, and in severe cases, the entire system can be completely rebuilt. This article will help you explain everything from technical principles to selection and implementation in one go.
##It's not just an upgraded version, it's a change in the architecture layer
H. 264 (also known as AVC) was released in 2003 and dominated the video industry for nearly twenty years. Its core idea is to cut the image into small blocks (macro blocks), predict and compress each block.
H. 265 (also known as HEVC) was released in 2013, upgrading macroblocks to "Coding Tree Units" (CTUs) and expanding the maximum size of a single block from 16 × 16 pixels to 64 × 64 pixels. The larger the block, the more thorough the elimination of redundant information within the same frame. Simply put, H.264 is paved with tiles, while H.265 is paved with large stone slabs. The larger the slab, the fewer gaps, resulting in higher compression efficiency.
##Comparison of Four Key Data Groups
|Metrics | H.264 | H.265 | Gap|
|------|-------|-------|------|
|Same picture quality bitrate | Benchmark | Reduced by about 40-50% | H.265 saves half of bandwidth|
|Same bitrate picture quality | Benchmark | Approximately 30-40% improvement | H.265 image cleaner|
|Encoding complexity | Benchmark | Approximately 2-5 times | High requirements for chip computing power|
|Hardware decoding support rate | Nearly 100% | 70-80% (not supported on older devices) | H.264 compatibility is unbeatable|
##The actual impact of bandwidth and storage
Assuming you have a path 1080P@30fps The video stream:
-H.264 encoding: bitrate of about 4-8 Mbps, daily storage of about 40-80 GB
-H.265 encoding: bitrate of about 2-4 Mbps, daily storage of about 20-40 GB
If it is a 16 channel monitoring project with a storage period of 30 days, H.265 can help you save nearly 10TB of hard disk space. Based on the price of enterprise grade hard drives, this is a cost difference of several thousand yuan.
For live streaming, H.265 can deliver higher image quality with the same upstream bandwidth. But there is a key constraint here: Does the live streaming platform support H.265 input? At present, most platforms still use H.264 as the mainstream, and H.265 support is gradually being promoted but has not yet reached the stage of "brainless selection".
##Hardware compatibility is the real decision point
H. The biggest barrier of 264 is not technology, but compatibility. From old phones ten years ago to the latest smart TVs, from browsers to players, there are almost no devices that do not support H.264.
H. The compatibility of 265 is not so optimistic:
-IOS/Android New Devices: Native Support
-Windows/Mac browsers: Chrome/Firefox support, but some older versions of Safari have limitations
-Embedded devices require specialized hardware decoding chips, which are more expensive than H.264 solutions
-Old devices (before 2016): Most likely not supported
If your product is aimed at the consumer market (such as users viewing surveillance footage on their own phones), H.264 is the safest choice. If it is a B-end solution (device provided by you, end-to-end controllable), the bitrate advantage of H.265 can be used with confidence.
##Selection mnemonic
Prioritize H.264 if:
-User side devices are uncontrollable (public live streaming, multi terminal playback)
-Resolution of 1080P or below
-Sensitive to encoding delay (H.264 encoding is faster)
-Limited budget (low hardware cost)
Resolutely adopt H.265, if:
-4K/8K Ultra High Definition Scene
-Storage and bandwidth costs are the main contradictions
-End to end device controllability (enterprise solution)
-Supported by hard coded chips (with controllable performance and power consumption)
##How did we choose
In the camera module and capture card solutions, Shiduan Wei will recommend different encoding schemes based on customer scenarios. For example, embedded USB camera modules have the highest requirements for real-time performance and compatibility, with H.264 being the main solution; In industrial camera solutions that require long-term video storage, the bitrate advantage of H.265 is very valuable.
The key is not which technology is more advanced, but which one better matches your hardware ecosystem and usage scenario.
If you want to learn about the encoding capability of the Vision Vision imaging solution, please visit the official website to check the product specifications.