EDIT: This is indeed a bug that has been fixed in https://github.com/josephwright/beamer/issues/437#event-1377360577 and should be available soon.

Since updating Miktex today (12/7/2017) I cannot compile my slides anymore. I keep getting the error

("C:\Program Files\MiKTeX 2.9\tex\latex\beamer\multimedia\multimedia.sty" ! Undefined control sequence. \beamer@pdfobj stream attr {/R 22050} {}\beamer@pdfrefobj \beamer... l.262 }

Deleting the multimedia package resolves the error. This seems like a bug as the beamer manual explicitly states that the package is compatible. I do not know where else to post this. A MWE is:





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