Then you should take a look at https://github.com/flanglet/kanzi-cpp https://github.com/flanglet/kanzi-cpp: it is optimized for fast roundtrips, multi-threaded

Then you should take a look at https://github.com/flanglet/kanzi-cpp https://github.com/flanglet/kanzi-cpp: it is optimized for fast roundtrips, multi-threaded by design and produces a seekable bitstream.