VAAPI encoders deviate from other encoders (e.g. AMF, NVENC) with
the "profile" setting being an integer instead of a string. With
enhanced broadcasting, "profile" is signalled as a string. Convert
the string-based profile to the appropriate integer-based profile
for VAAPI encoders as a workaround, until VAAPI supports string-based
"profile" (if ever).
Alex Luccisano