Video Playback virtually impossible on Neo Freerunner? (Re: Video of Qt 4.4 on Neo1973: brings iPhone like graphics)
ramsesoriginal at gmail.com
Mon Apr 28 13:47:55 CEST 2008
I think this would be great..
Ideally it would not decode it completely, but simply encode the video
with some simpler compression...
Another question: if we skip sound, would the decoding be faster? By how much?
On Mon, Apr 28, 2008 at 8:17 AM, Flyin_bbb8 <flyin.bbb8 at gmail.com> wrote:
> 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>
> > babbled:
> > > 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>
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