Comment by rorosen

From what I can see zstd-seekable is more closely aligned to the C functions in the zstd repo.

The decompress function in zstd-seekable starts decompression at the beginning of the frame to which the offset belongs and discards data until the offset is reached. It also just stops decompression at the specified offset. Zeekstd uses complete frames as the smallest possible decompression unit, as only the checksum data of a complete frame can be verified.