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Thursday, December 17, 2015

Differences H.265 and H.264

Differences between H.265 and H.264

A codec is an encoder and a decoder. An encoder compresses audio or video so it takes up less disk space. A decoder extracts audio or video information from the compressed file. Video and audio compression is a complex technical process, but the basic aim of a codec is quite straightforward:

(a) Reduce the size of the compressed media file as much as possible, but...(b) Keep the quality of the decoded audio and video as good as possible.

What is H.264?
H264 (aka MPEG-4 AVC) is currently a mainstream video compression format. It is widely used in Blu-ray discs, internet sources like videos in YouTube and iTunes Store, web software, and also HDTV broadcasts over terrestrial, cable and satellite.

What is H.265?
H.265 (also known as HEVC, short for High Efficiency Video Coding, developed by the Joint Collaborative Team on Video Coding (JCT-VC)) is a video compression standard whose predecessor is H.264/MPEG-4 AVC. H.265 HEVC ensures to deliver video quality identical to H.264 AVC at only half the bit rate, including better compression, delicate image and bandwidth saving. It Support up to 8K, Support up to 300 fps. It is likely to implement Ultra HD, 2K, 4K for Broadcast and Online (OTT).

H.265 vs H.264: Differences between H.265 and H.264

In general, H.265 has several big advantages over H.264, including better compression, delicate image and bandwidth saving. For more detailed differences, please read H.265 vs H.264 comparison table.

4 pcs 2MP IP cameras for 1 month, stream: 4096Kbps. 
H.264 IP camera need 42G×4×30=5T=1×3T+1×2T, so need 1 pc 3T and 1pc 2T HDD. 
H.265 IP camera need 21G×4×30=2.5T, so need 1 pc 3T HDD only, save at least 1 pc 2T HDD cost. 
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  4. HybridsuFebruary 21, 2021 at 5:29 PM

    I’m really confused about what you guys are talking about haha. I’m a systems engineer (for background). The result of compressing with this codec given an already compressed source, is the similar as when repeating with a raw source - in that doesn’t matter massively that you already compressed it for respect to the final file size within reason, for a given final quality - but as you are adding compression twice you will
    experience this degradation twice e.g. an h.264 video file which is of good quality (subjective) is recompressed to an h.265 or h.266 standard, then it will have similar size once it’s in h.265/.266 format when compared to the same process intiated from the original raw source (but lower than the previous source quality, compressed or otherwise) - There are more things to consider, but strings of 0’s are not relevant :) This is not a zip file which needs to retain identical information, nor is it a music file where silence exists across a frequency band.

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