Video Playback virtually impossible on Neo Freerunner? (Re: Video of Qt 4.4 on Neo1973: brings iPhone like graphics)

Federico Lorenzi florenzi at gmail.com
Mon Apr 28 00:48:53 CEST 2008


Well, after doing a few tests, (mainly thanks to ahven and SpeedEvil
on IRC), the Neo can handle a 160x128 H264 (with CABAC) encoded video
at 40kbps with a 12kbps audio track. The fun comes in with the
scaling. Scaling to 320x240 with no frame dropping is possible if I
encode the video as baseline H264. However, I think the Freerunner,
especially with a beefier processor and hardware scaling, should
perform quite a bit better. The scaling seems to give quite a big
performance hit.

Cheers,
Federico

PS) I do not own a Neo, and I'm not an expert on anything

On 4/27/08, Kristian 'kriss' Mueller <kriss at mput.de> wrote:
> Hi Christoph
>
> Am Donnerstag, den 24.04.2008, 11:19 +0200 schrieb Christoph Witzany:
> > 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).
>
> I did some testing on that with GTA01.
>
>
> > Please correct me if I misunderstood.
>
> Even with GTA01 it was possible - though the tests I made there are not
> valid for GTA02 (don't have one yet).
>
> What I found out with mplayer is:
>
> 1) H.264 will take to much time to decompress (even at low bitrates)
> 2) SDL will be the fastest way to output without HW acceleration
> 3) using H.263 (as Youtube does) I could get the best
>    compression/bitrate/speed ratio
> 4) using 320x240 and scale to 640x480 (480x640) is doable
>
> Some of those findings are documented at the buttom of
> http://wiki.openmoko.org/index.php?title=Video_Player
>
>
> > If I interpreted Carsten right 640x480 video will
> > display at 5-10 fps at best, right?
>
> Actually with GTA01 I've had 13 fps in fullscreen mode (320x240 ->
> 480x640) which looked really okay and was viewable.
>
> A 640x480 H.263 though with reasonable bitrate took to much cpu-power to
> decode.
>
> Anyway, with GTA02 you should take a try - it seems doable in SW even
> without 2D acceleration, as it just has more cpu power. - try to start
> with:
>
> mencoder -quiet -ofps 13 -vf scale -zoom -xy 352 -af channels=1:0:0:1:0
> \
> -oac lavc -ovc lavc -lavcopts \
> acodec=mp3:vcodec=h263p:autoaspect=1:vbitrate=200:abitrate=32 \
> -o <outfile> <infile>
>
> mplayer -autosync 30 -vf scale -zoom -xy 640 -vf rotate=1 -sws 0
> -nodouble \
> -vo sdl -fs -framedrop <tagetfile>
>
>
> Greetings from Berlin
>
> Kristian
>
>
> --
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>
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