Stronghold X264 top -

Standard x264 allows up to 16 reference frames, but if a ref is corrupted, all dependent frames die. Stronghold encodes shadow references — duplicate copies of key ref frames stored in separate NAL units. Decoder overhead is ~3-5% bitrate increase, but recovery from bitflips is now possible without an IDR.

Whether you are archiving movies (often referred to as creating a "stronghold" of media) or configuring a stream, understanding x264 is essential. stronghold x264