Mediaconch policies to fulfill the needs of SLUBArchiv preservation requirements

based on:

• system policy "Example MKV FFV1 digitization policy" by mediaconch
• public policy "Video file is MKV + FFV1-Intra + PCM or FLAC with CRC32 everywhere" by Jérôme Martinez (MediaArea), CC-BY-SA-4.0+

Mediaconch is an open source tool to validate and standardize audiovisual files for long-term preservation, see https://mediaarea.net/MediaConch/ for details