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

[belcampo]

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.
>>>
>>> Precisely.
>>>
>>> However, "several frames" can actually be many tens or of frames, 
>>> maybe a hundred frames in some edge circumstances, and with intensive 
>>> codecs that's a very big job.
>> Do you know any, where I-Frames/Key-frames are more then 12 (PAL) or 
>> 15 (NTSC) between. Where are larger GOP-sizes used ??
> In a smooth video intervals are 100-300 frames.
If quality source is assumed DVD DVB BlueRay this holds not true I think.
> (consider 720p, it costs 1.3MBytes for frame,
BBC-HD is 21.4 Mbps overall bit rate at 25fps, being .856Mb per frame 
.107MB per frame
  300 frames are huge bulk
32MB
> of memory)
> 
> Phil
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