doc/filters: put ladspa configure option into @code{}

Signed-off-by: Paul B Mahol <onemda@gmail.com>
doc/fftools: rework some paragraph in the AVOptions chapter

Fix typos, and clarify note about codec AVOptions.
doc/filters: use between() function in select examples

Simplify.
doc/filters: add [] labels for the graph of the opening paragraph example

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
avcodec/escape124: fix infinite loop

Remove can_safely_read() as its not really needed with
checked bitstream reader.

Fixes #2984.
Reported-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
libopenjpeg: init and close properly; don't config during encode

Signed-off-by: Michael Bradshaw <mjbshaw@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>