It's not that confusing: Libav is the audio/video library; libavcodec is the audio/video encoding/decoding library; libva is a separate, sort-of (un)related library. What else is there to confuse?
I know, you could accidentally write libva instead of libav, but you could just as easily write 'too' instead of 'to', or 3 instead of 4. It's not that big a deal (unless you have a mental condition where you sometimes transpose letters in words, or words in sentences, but then anything to do with reading or writing becomes difficult). If you accidentally search for the wrong one, you'll likely notice that what you are reading is unrelated to what you thought you were searching for, and hopefully will realize you mistyped the name. Otherwise, if absolutely necessary, they can put a notice on their site pointing visitors to the other similarly named project page.
A more likely source of confusion would be that of libav and LibAV ("Liberty AV Solutions"), which is what I found when doing a search on Google. Unfortunately, Google doesn't provide a way to discriminate based on letter case (I imagine that would increase server load, which is why an option for it hasn't been made), so we're left to sift through the (40,000) results ourselves.


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