Re: excessively slow image animation

[Daniel Pittman <slippycheeze@google.com>]

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On Wed, Feb 13, 2019 at 9:56 AM Evgeny Zajcev <lg.zevlg@gmail.com> wrote:

> I've got multi frame image at http://lgarc.narod.ru/giphy.mp4
> 18 seconds to show every frame
>

Time to fully extract the images from that (cold cache) on my laptop was ~
30 seconds.  It contains one key frame, the very first, and everything else
is a P frame, so to decode frame 20 you need to run forward applying 19
frames worth of data from the start.

If the components were being cached or generated independently – highly
likely, I suspect – then that time-cost would be paid the first time.  A
grand total of 18 seconds to do that processing doesn't actually sound
unreasonable to me, honestly, given that decoding all those frames in
individual processes takes ~ 5.35 seconds total on my machine.  It wouldn't
take much inefficiency on top of that to bring it up to that rate.

>

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