As we mentioned, the settings we review in this post are specifically for H.264 streaming encoding. H.264 is the optimal codec for live video streaming, so we will discuss encoders compatible with video streaming protocols. H.264 bitrate is great for live streaming and video-on-demand.
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We might hope it's otherwise, but the fact is that users reuse credentials. The first time someone signs up for your site of captioned cat pictures using the same email address and password that they use for their bank login, your seemingly low-risk credentials database has become a vehicle for storing financial credentials. If a rogue employee or an external hacker steals your credentials data, they can use them for attempted logins to major bank sites until they find the one person who made the mistake of using their credentials with wackycatcaptions.org, and one of your user's accounts is drained of funds and you are, at least in part, responsible.
We ran many experiments to identify heuristics that maximize compression without impacting ORCFile write performance. Strings dominate the largest tables in our warehouse and make up about 80% of the columns across the warehouse, so optimizing compression for string columns was important. By using a threshold on observed number of distinct column values per stripe, we modified the ORCFile writer to apply dictionary encoding to a stripe only when beneficial. Additionally, we sample the column values and take the character set of the column into account, since a small character set can be leveraged by codecs like Zlib for good compression and dictionary encoding then becomes unnecessary or sometimes even detrimental if applied.
Apple's FaceTime Audio uses the AAC-HE codec at 16KHz to make voice calls. That produces a quality that's as good, or better, than carrier HD Voice. It works across all current iPhone models, on every carrier, so it's a great way to hack higher quality voice into your world if you live amongst iPhone folks.
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