[MPlayer-users] how to "step backforward" ?

[belcampo]

belcampo wrote:
> Phil Oleynik wrote:
>> belcampo wrote:
>>> Phil Rhodes wrote:
>>>>> stepping forward is rather simple, it is 'normal'play at 
>>>>> non-standard speed.
>>>>> Going back is difficult in the sense you have to calculate several
>>>>> frames plus/minus the differences to 'know' how that former frame has
>>>>> looked.
Mplayer already has a 10min and 10sec back and forth option, and the 
frame forward option. How difficult is it to 'copy' the 10sec option and 
make an extra divide by 250 if it's PAL or 30000/1001 if it's NTSC ?