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by AltruisticGapHN
1038 days ago
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Yes that is probably what it was! I'll remember that even two+ days after the initial upload, there may still be reencoding. I thought this was only few hours after the creator uploads. So the smaller filesize also is not necessarily a sign of lower quality. In this case it's because it gets a quick first encoding like zip with fast compression, and then it gets reencoded presumably by something much more CPU intensive. That said from 500mb to 400mb is a bit dodgy but what do I know maybe VP9 is that good. |
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When encoding videos there's a "speed" parameter that basically tells the encoder to spend more CPU time compressing the frames. It results in a smaller output size while maintaining the same level of quality but takes much longer to encode. I'm sure that's part of what YT is doing here, an initial quick encode to get the video live then another pass to reduce filesize for long term storage. Good find!
I'm guessing that the perceived higher quality in the smaller file is because the encoder was able to find a more accurate way to represent those frames with the same or fewer number of bits since it has more time to search for the optimal encoding.