[non-BE] MD coding in ISM inactive frames
Fix MD coding in ISM inactive frames:
- use of low-bitrate mode with MD in inactive frames
- changes in ISM signaling
- NULL metadata objects now also use the adaptive bit-rate distribution
Related to #532 (closed)
Non bit-exact operating points: ISM format for bitrates up to 48 kbps per object + all ISM conditions with NULL metadata
Edited by vaclav