The dvbtools project's CVS data is in read-only mode, so the project may have switched over to another source-code-management system. To check, visit the Project Summary Page for dvbtools and see if the menubar lists a newer code repository, such as SVN or Git.
The CVS data can be accessed as follows.
You can run a per-module CVS checkout via pserver protocol:
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P dvbdate
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P dvbimage
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P dvbstream
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P dvbsubs
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P dvbtext
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P dvbts2pes
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P dvbts2ps
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P dvbtune
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P mp2cut
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P pesdump
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/dvbtools co -P rtptsaudio
You can view a list of files or copy all the CVS repository data via rsync (the 1st command lists the files, the 2nd copies):
rsync -a a.cvs.sourceforge.net::cvsroot/dvbtools/
rsync -ai a.cvs.sourceforge.net::cvsroot/dvbtools/ /my/local/dest/dir/
If you are a project admin for dvbtools, you can request that this page redirect to another repo on your project by submitting a support request.