a nice parameter would be AV_SYNC_FACTOR and SPU_SYNC_FACTOR which would=20
accompagny the AV SYNC and SPU SYNC.
then, it would be possible for a frontend (ie: xine-ui) to have 2 new menu=
items: under Subtitle --> Synchronize and under Audio --> Synchronize.
SPU would do 2 things:
- select the 3rd subtitle
- display a small window with plus/minus and OK button, Cancel Button,=20
- after registering the offset press ok
- select the 3rd last subtitle
- display a small window with plus/minus and OK/Cancel/OK+Save button,=20
- after registering the offset press ok/ok+save
(if save: try to rewrite the external spu file.)
and reset sync + factor
use sync+factor for lineair interpolation of SPU
=2D-> the movie starts to play from beginning
(audio would be similar)