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.
(consider 720p, it costs 1.3MBytes for frame, 300 frames are huge bulk
of memory)
Phil
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