The code assumes that s->streams[0] is valid.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
(cherry picked from commit ff100c9d)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>