mem: Document the non-compatibility of av_realloc() and av_malloc()
avcodec/simple_idct_template: adjust coeffs for 12bit idct

This prevents overflows with 12bit jpegs
Fixes Ticket2952

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
doc/encoders: add doc for AAC encoder

Thanks-to: Kostya Shishkov <kostya.shishkov@gmail.com>
Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
doc/encoders: improve libvo-aacenc doc

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  mem: Document the non-compatibility of av_realloc() and av_malloc()

Merged-by: Michael Niedermayer <michaelni@gmx.at>
matroskadec: Mute "Unknown entry" log messages for CueRelativePosition entries

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>