[maemo-developers] [maemo-developers] Ogg Vorbis and the N800 - Theora

[From: MoRpHeUz]

Krischan,

  Can you provide the theora plugin for us, so I can do some tests also ?

If we could use theora for video decoding and tremor for audio
decoding would be wonderful ! =) We just need to make it (theora) also
use vfp...

Doing that we will be able to watch some streaming without the need of
mplayer...

MoRpHeUz

PS: I can help you with tests and buildings...I'm online all day
(morpheuz at gmail.com and at #maemo)

On 2/8/07, Krischan Keitsch <krischan.keitsch at alumni.tu-berlin.de> wrote:
> Am Donnerstag, 8. Februar 2007 schriKrischan KeitsKrischan Keits eb MoRpHeUz:
> > This ogg files you're playing contain video ? I was just able to play
> > audio until now...
> >
> >
> > Best Regards,
> >
> >
> > MoRpHeUz
>
> Yes, I also build the theora plugin.
>
> I did a short test this morning:
>
> Theora and vorbis on n800
> I transcoded the "Discovery.avi" with ffmpeg2theora with the default settings.
>
> Theora video:
> 352x208
>
> 1) theora video only
> gst-launch-0.10 filesrc location=Discovery.ogg ! oggdemux ! theoradec !
> xvimagesink
>
> cpu: ~45%
> The theora video is beeing played in a window not full screen. The video
> playback is good. No skips. :-) Looks promissing. I will try some higher
> resolutions & frame rates soon.
>
>
> 2) theora video and vfp-vorbis decoding
> gst-launch-0.10 filesrc location=Discovery.ogg ! oggdemux name=demuxer !
> {queue ! theoradec ! xvimagesink} {demuxer.!queue ! vorbisdec !
> audioconvert ! dsppcmsink}
>
> cpu: ~ 80 (45% & 35%)
> Vorbis playback using the vfp causes ~35% cpu. Theora decoding is like in 1).
> It adds up to ~80% and I experienced many  skips. Playback is not in sync,
> halts, skips ...  :-(
>
>
> However when I try to use tremor (just takes ~12% cpu) based audio decoding I
> am out of luck.
>
> If it is possible to let the tremor plugin do the audiodecoding, what would be
> the right gst-lanuch string?
>
> I need some advice from you gst gurus!
>
> Regards Krischan
>
> PS: 770 & n800 are not _just_ internet tablets. They are a hell of a
> multimedia device. The more time I spend using my n800 and 770 the more
> impressed I get!
>
>
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