It happened again, from Jan 1st I can't mux again with this error:
[matroska,webm @ 0x1572f40] Invalid EBML number size tag 0x01 at pos 1427 (0x593)
sh978VID2020270.webm: Input/output error
Nothing was updated on the server.
I've uploaded the sample files using your form, and this is my ffmpeg...