Demote dvdemux to marginal
dvdec) both rely on libdv which hasn't been maintained in ages.
- Means it doesn't properly recognize any non-SD formats (i.e. all the DVCPro variants)
- The fact that it's not maintained means that we can't really fix/improve it. If ever there are any security issues that's also worrying
I propose we do like for
dvdec and we demote the rank of
dvdemux to marginal, and enable the gst-libav DV demuxer with a rank of SECONDARY. I've tested a few files with that demuxer and it works fine.