In the [RED filter transform engine](https://github.com/jitsi/libjitsi/blob/751bbff49f041e92ee67254ea7b60df4d844308c/src/org/jitsi/impl/neomedia/transform/REDFilterTransformEngine.java), if, instead of [left-shifting the payload](https://github.com/jitsi/libjitsi/blob/751bbff49f041e92ee67254ea7b60df4d844308c/src/org/jitsi/impl/neomedia/transform/REDFilterTransformEngine.java#L178), we right-shift the header, the SRTP auth tag becomes corrupted and the client discards the packets because that.
This is an indication that we have a non-zero offset bug somewhere in libjitsi, probably inside the SRTP transformers
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https://github.com/jitsi/libjitsi/issues/43