doc: mention the noise_bsf parameter in the docs

This looks more like a seed than an amount, as the variable name
could lead to think.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/crypto: added encryption

Signed-off-by: Christian Suloway <csuloway@globaleagleent.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/crypto: Use av_memdup()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
tests: Rename vsynth2 to vsynth_lena

This avoids confusion with a growing number of vsynth tests

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
tests: Add vsynth2 which uses the new reference.pnm

The file is already present in git and by using it we can perform more tests
without the need of fate samples

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>