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

From: Krischan Keitsch krischan.keitsch at alumni.tu-berlin.de
Date: Thu Feb 8 21:38:10 EET 2007
Am Donnerstag, 8. Februar 2007 schrieb 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:

1) theora video only
gst-launch-0.10 filesrc location=Discovery.ogg ! oggdemux ! theoradec ! 

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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