Video Playback virtually impossible on Neo Freerunner? (Re: Video of Qt 4.4 on Neo1973: brings iPhone like graphics)
David Samblas Martinez
dsamblas at yahoo.es
Thu Apr 24 12:44:50 CEST 2008
I'm gonna still buy the freerunner when as soon as it
become avialble and I will work as hard as my
non-linux-freak life let me do it.
But I have to admit than this video limitation in the
neo's video has dissapoint me very deeply.
The good news is that I have been disapointed BEFORE I
have bought the neo and even Before the freerunner is
released so OM gives me the oportunity to decide and
evaluate if this is a stopper to buy this phone or
Can any of the core team confirm this video
--- Christoph Witzany <mail at doublemalt.net> escribió:
> As I understood Video playback will be virtually
> impossible on the
> freerunner, at least from the sd card (which is the
> only sensible
> location to store videos on the neo ftm).
> Please correct me if I misunderstood.
> Well that could have the potential to kill the
> Freerunner as consumer
> product. Just because virtually every other 100$
> phone does it which is
> shaping the consumers' expectations.
> And while I do not expect to use this feature more
> than a couple times a
> month it would make me reconsider using it as my
> main phone (I'll be
> using it as development platform, so it doesn't
> matter for now).
> I think that this design should be reconsidered as
> soon as possible if
> Openmoko really wants to go into the consumer
> PS: What about streaming media from the net? Any
> musings and/or actual
> experiences with that? If I interpreted Carsten
> right 640x480 video will
> display at 5-10 fps at best, right?
> Carsten Haitzler (The Rasterman) schrieb:
> > On Thu, 24 Apr 2008 09:24:26 +0200 polz
> <polz at aufbix.org> babbled:
> >> On Thursday 24 April 2008 05:52:52 Carsten
> Haitzler wrote:
> >>> On Wed, 23 Apr 2008 18:28:40 +0200 thomasg
> <thomas at gstaedtner.net> babbled:
> >>> yup. those 7m/sec (that's write to video ram) is
> also shared with SD card
> >>> IO.
> >> Correct me if I'm wrong, but it seems to me that
> this means it should be
> >> impossible to playback videos in full-screen from
> an SD card on a gta02.
> >> 640*480*25 = 7680000 and that's with 8bpp.
> >> Has anyone tested video playback on a GTA02 yet ?
> > correct. yuv will be w * h * 1.5 bytes for 1 frame
> (standard video yuv). so
> > 3240x240*1.5*30 (320x240 @ 30fps) = 3.4m/sec -
> BUT... when u are copying you
> > have ZERO cpu cycles to decode the next video
> frame. so that means 50% of cpu
> > cycles will be spent ONLY copying video data to
> video ram. the other 50% u have
> > left to decode the mpeg1/2/4 or whatever video in
> system ram to a yuv buffer. i
> > would say this is the realistic highest resolution
> you will get. 480x320 at 30fps
> > is the MOST you will get (6.9m/sec), but u have
> ZERO (or almost) cpu cycles to
> > actually decode the video into yuv.
> > remember here i am assuming use of xvideo and the
> yuv to rgb conversion and
> > scaling on the glamo - which xglamo does support.
> if you do software yuv->rgb +
> > scale then its even less fun. with software. the
> best u will get is 11fps at
> > 640x480 - and this is NO cpu cycles to actually
> decode the video, convert it to
> > 16bit rgb and scale. in reality i expect you to
> see 2-5fps in this scenario,
> > maybe eve 1fps.
> > this is ONLY playback if the video data is already
> in ram - ie the mpeg data is
> > cached. if it is read off internal flash you will
> pay an IO cost - but it's not
> > shared with the glamo bus. if it is on SD card -
> you will basically have to now
> > share the IO between SD and graphics. i believe
> the graphics IO takes
> > precedence over SD card IO, so as long as u keep
> the glamo gfx bus busy, sd
> > will be on hold until u stop. then some sd io can
> get through.
> > with the glamo you need to be careful what you do
> and how you do it. if you can
> > keep something entirely within the glamo - it
> should be ok. so things like
> > uploaded pixmaps and then blitting them around is
> ok. video decode is another
> > matter entirely. the glamo has an mpeg4 decoder on
> it - but we don't have any
> > api to access that directly/sanely and just feed
> it an mpeg4 stream. any other
> > codec has to be done on the cpu anyway and
> uploaded across the bus as yuv data.
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