If any codec compresses "a lot better than" a lossless codec, then it is probably lossy. All lossless codecs will have a similar strength, and compared to uncompressed video with the same color space and depth, the ratio is hardly better than 1:5 in optimal cases, rather around 1:2.5 to 1:3.
The Ut Video Codec Suite is also very efficient and very versatile, supports many sample formats.
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