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Changes between Initial Version and Version 1 of Ticket #756, comment 4


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Timestamp:
01/24/15 07:23:10 (4 years ago)
Author:
Antoine Martin
Comment:

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  • Ticket #756, comment 4

    initial v1  
    55I should explain: delta means that we substract the previous contents of a region from its current contents before compression.
    66So if you end up showing more or less the same contents, you end up with something empty as delta - which compresses very well.
    7 Video compressors already do this by default (that's why they compress so well - and also why the size of the video cannot change without a full encoder re-initialization), we use delta compression on picture encoders (rgb+lz4, png, jpeg, etc..) to benefit from the same trick.
     7Video compressors already do this by default (that's why they compress so well - and also why the size of the video cannot change without a full encoder re-initialization), we use delta compression on lossless picture encodings (rgb24/rgb32+lz4 and png) to benefit from the same trick.