[theora] Theora encoder performance

[Mircea Gliga]

    With all the measurements I've done with the images from my webcam ( 
the API
calls: /th_encode_ycbcr_in/ and /th_encode_packetout/ take *80 ms *when 
there
is a lot of motion from the webcam ), I've come to the conclusion that I 
can only
encode around 10-12 frames/sec without any other image processing ( YUV 
conversion, etc).


Mircea Gliga wrote:
> I'm evaluating some video codecs for a online conference system. I'm 
> encoding images (640x480)
> from a webcam. I've been playing around with theora and xvid.
>     First of all, using theora, the decoded image looks strange: 
> http://integrasoft.ro/~mgliga/theora/comparison.png 
> <http://integrasoft.ro/%7Emgliga/theora/comparison.png>.
> On the left side the image from the webcam, on the right side the 
> image from the
> webcam encoded, and then decoded using theora. As you can see there 
> are some strange
> colors overs there ( looks like edge detection  :-D ).
>     Then I measured how long does it take for Theora to encode an 
> image (/th_encode_ycbcr_in/ and /
> th_encode_packetout/ calls).
>
>     int TIMER_t0 = GetTickCount();
>     int ret = th_encode_ycbcr_in( (th_enc_ctx*)m_encoderHandler, ycbcr);
>     ogg_packet    op;
>     th_encode_packetout((th_enc_ctx*)m_encoderHandler,0,&op)>0
>     int TIMER_t1 = GetTickCount();
>     printf( "Timer : %d \n",TIMER_t1 - TIMER_t0 );
>
>     On average: *80 ms*.
>    
>     Using XVID I've obtained between *20-25 ms* for an image. That's 
> 60ms longer using Theora.
>     I don't know if I am doing something wrong while initializing the 
> encoder, or that's the way it
> supposed to be. The encoder initialization used by me can be found 
> here: http://integrasoft.ro/~mgliga/theora/theora_init.cpp 
> <http://integrasoft.ro/%7Emgliga/theora/comparison.png>
>    
>     Used hardware/software:
>     Processor    Pentium(R) Dual-Core  CPU      E5200  @ 2.50GHz, 2400 
> Mhz, 2 Core(s), 2 Logical Processor(s)
>     Installed Physical Memory (RAM)    2.00 GB
>     OS Name    Microsoft® Windows Vista^(TM)
>    
>
> Any ideas or suggestions are welcomed.
>    
> -- 
> Mircea Gliga
>   
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