Fixes incorrect offset when playing http://streams.videolan.org/misc/test-files-ccc/vsfilter_general_TestCase.mkvSigned-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 3f106f42be8e7d5b66b74b0c6cf96a6f513eec90)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>