[android-developers] Re: Speed up dalvikvm calls

be very very care full to call .release() { or whatever the actual
release call is named } then what the others are telling you will get
you an efficiency improvement

for what you want to do the ICS [14] is exactly what that is for

On Nov 16, 11:40 am, New Developer <secur...@isscp.com> wrote:
> Thanks Daniel
>
> Iam trying to call it every 5ms  But I would settle for as fast as possible.
>
> I have tried so somehow buffer, thus trying to do all the I/O first and
> then just view
> but this has failed hopelessly I can only load 15 frames into memory and
> then get an OutOfMemory
>
> Do you by any chance know how to find the bandwidth of the Xoom and Sony
> S bus what is it capable of
> If I have to call every 20ms  but get a smoother flowing video playback
> that would be fine.
>
> It's just right now I read every 327  or 327000  frames
> frame is not incremented by 1 but by 327  this works for the timing it
> now takes 15 sec to play a 15 sec video
> BUT you are skipping so much that it is obviously  jerky and does not
> flow.  Would love to
> increment frame by 10, but then then the handle cycle to be faster.
>
> any ideas ?
>
> thanks in advance
>
> On 11/16/2011 12:18 PM, Daniel Drozdzewski wrote:
>
>
>
>
>
>
>
> > On 16 November 2011 16:45, New Developer<secur...@isscp.com>  wrote:
> >> Thanks to all
>
> >> It is a video player   I'm using the MediaMetadataRetriever  so that I can
> >> load and if necessary stop and edit a bitmap
>
> >> I've tried (obviously unsuccessfully to read the bitmap and make it smaller
> >> (for the purpose of memory)
> >> the original video is 1280 x 720  I was trying to save this as a  320 x 180
> >> bitmap  so as to use up less memory
>
> >> mBitmap  = Bitmap.createScaledBitmap(retriever.getFrameAtTime(frame*1000) ,
> >> 320 , 180 , false);
> >> Item.setImageBitmap(mBitmap);                        //    1280 x 720
> > Here ^^^ mBitmap is 320x180, however retriever.getFrameAtTime()
> > returns the full thing...
>
> > How often is this code called? Do you know, that retriever does I/O to
> > pull the frame out?
>
> > Are you trying to have it running every 5ms?
>
> > Do you appreciate that 1280 x 720 x 4B = 3.5MiB and if you want that
> > every 5ms, then your I/O bus and memory bus would have to have
> > bandwidth of 700MiB (assuming processing takes zero time in the 5ms
> > slot, which obviously it doesn't).
>
> > That is a big ask for any mobile phone.

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