tree b623eb80ded8eee53341edd1d52914c2eb659f5e
parent 945b92873061c66b82df892887cd9baf8146857b
author Andreas Rheinhardt <andreas.rheinhardt@gmail.com> 1572605387 +0100
committer Andreas Rheinhardt <andreas.rheinhardt@gmail.com> 1587447070 +0200

avformat/matroskaenc: Add check for using explicit TrackNumber

When creating DASH streams, the TrackNumber is externally prescribed
and not derived from the number of streams in the AVFormatContext, so
if the number of tracks for a file using an explicit TrackNumber was
more than one, the resulting file would be broken (it would be impossible
to tell to which track a Block belongs if different tracks share the
same TrackNumber). So disallow this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>