n8.1.1
fftools/ffprobe: add base64 data dump format
fftools/textformat: correctly propagate uninit error codes
fftools/textformat: Introduce common header and deduplicate code
fftools/tf_internal: Use av_default_item_name
fftools/tf_mermaid: close subgraph header when there are no inputs.
fftools/graphprint: Add execution graph printing
fftools/ffprobe: use an AVTextFormatOptions struct in AVTextFormatContext