Video Playback virtually impossible on Neo Freerunner? (Re: Video of Qt 4.4 on Neo1973: brings iPhone like graphics)
flyin.bbb8 at gmail.com
Mon Apr 28 08:17:18 CEST 2008
just thinking out loud here, for example maybe you have some short videos
you want to show to some other people, so u can open an app that checks the
amount of memory you have, then checks the amount it needs to do
decoding..... if it has enough it does the decoding (not at full speed) 'n
lets u know when it's complete, then u can watch it 'n decide if u wanna
watch it again or delete the decoded part from memory again... not sure if
this is possible, not an expert here...
On Mon, Apr 28, 2008 at 4:47 AM, The Rasterman Carsten Haitzler <
raster at openmoko.org> wrote:
> On Mon, 28 Apr 2008 03:09:51 +0200 ramsesoriginal <
> ramsesoriginal at gmail.com>
> > I'm not an expert, so maybe this question is silly, but it just popped
> > to my mind: using mencod, couldn't you decode the video, store it in
> > decoded form and then you have onyl to copy it? If this would be
> > possible, you cold make some sort of video-transfere-applciation where
> > you can set the desidred speed/size/ratio..
> > again, i have no idea if it's possible, just 2 thoughts from my side..
> yes. that's possible. of course your 100mb movie file becomes about 1-2gb
> now :) maybe more...
> in theory u should manage 512x384 at 24fps (24fps is movie framerate in the
> cinemas). as u have almost no decode (though you have to read it from some
> souce). so u need an IO source that can stream 7mb/sec to you (good luck
> finding that!) but *IF* u did... a 2 hour movie would be about 46gb of
> good luck finding that storage too! :)
> in other words... "not practical to have it unencoded to avoid decoding".
> i used a 2hr movie just as an example so you know just how much video
> compression gets you... it saves an AMAZING amount of space. the numbers
> pure video source (that is zero quality loss original RGB data) is double
> for 512x384 at 24fps. (92gb)...
> in the end beyond a "hey my phone is so cool i play high-res video" demos
> of 30
> second clips (that woul still be enormous and u wouldnt be able to store
> than 1 or 2 anyway - but as a demo to show off its enough), it is just not
> useful or practical.
> yes - we can go for simpler compression schmes that still require decode,
> just less effort and eerything just adjusts. we spend less decode time,
> require more IO bandwidth and vice-versa. once decoded u have a tradeoff
> resolution vs frames per second as the pipe u have to send it down is
> fixed in
> size. you choose your favorite tradeoff, but somewhere there you will need
> make one.
> Carsten Haitzler (The Rasterman) <raster at openmoko.org>
> Openmoko community mailing list
> community at lists.openmoko.org
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