d16515ae5fe7daa6327d903cafb9a5ee43477b1e

This avoids a segfault in avconv_opt.c:opt_target when trying to
determine the norm.
(cherry picked from commit dc71f19588
)
Signed-off-by: Diego Biurrun <diego@biurrun.de>
Libav README ------------ 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.
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