Improving ext4: bigalloc, inline data, and metadata checksums

The idea with the Ogg checksums was to protect the listener's ears (and possibly speakers) from corrupt output. It's also nice to have a built-in check for data corruption in your archives, which is working as designed here.

What you said is valid for video, because we're more tolerant of high frequency visual noise, and because the extra data dimensions and longer prediction intervals mean you can get more useful information from a corrupt frame than you do with audio. Making the checksum optional for the packet data is one of the things we'd do if we ever revised the Ogg format.