[Cin] Seconds to preroll render

[Phyllis Smith]

For me it also makes a difference and it should be put into the manual for
sure as a possibility on some computers.  I assume it is based on the speed
to get to the disks??  And there is probably a "sweet spot" for anyone's
specific system.

Here are my observations but not totally scientific based on 64-bit Fedora
31/32.
Input File: Big Buck Bunny with Video Effect brightness/contrast applied;
Play every frame enabled (I got different results when not Play every
frame).
*HP slow laptop* Forward Framerate Achieved = 32 for .5, 1.0, and 2.0
seconds.
  *0.5 *seconds Reverse Framerate Achieved average = *15* and varied from a
low of 9 to a high of 18
  *1.0* seconds Reverse Framerate Achieved average = *18 *and varied from a
low of 15 to a high of 23  -- playing seemed moe consistent
  2.0 seconds Reverse Framerate Achieved average = 17 and varied from a low
of 13 to a high of 23
*AMD gaming laptop* Forward Framerate Achieved = 60 for .5, 1.0 and 2.0
seconds.
*  0.5 *seconds Reverse Framerate Achieved average = *32* and varied from a
low of 19 to a high of 40
  *1.0* seconds Reverse Framerate Achieved average = *36 *and varied from a
low of 28 to a high of 42  -- playing seemed moe consistent
  2.0 seconds Reverse Framerate Achieved average = 35 and varied from a low
of 30 to a high of 43

On Tue, May 3, 2022 at 2:18 AM Andrea paz via Cin <
cin at lists.cinelerra-gg.org> wrote:

> One thing that has always bothered me is that in the transition from
> an 11 year old notebook to a mid-to-high level PC, playback and
> especially reverse playback always suffered from the same lags and
> framerate drops. There wasn't the improvement I expected. In the
> Preferences > Performance tab, I tried increasing the "Cache size"
> from 256MB (default) to 4096MB without noticing any change (I have
> 32GB of RAM). I never touched the "Seconds to preroll renders" option,
> which by default is 0.5 seconds. Now I've tried to set it to 1.0s and
> the improvement in playback and reverse playback is EVIDENT!
> If anyone feels like trying to take a problematic project in timeline
> and increase the preroll time and then report the results, it would be
> a favor to me. If the improvement is also confirmed by others I will
> immediately put the tip in the manual, because it seems very important
> to me.
> --
> Cin mailing list
> Cin at lists.cinelerra-gg.org
> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>
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