[theora] ignoring audio in player_example

[Mayer, Jim]

Thanks Maik,

Actually, disabling the header does seem to work.  I added a
"--ignoreaudio" switch that disables the vorbis header and it works fine
on my Intel box.  The problem turns out to have been a corrupt input
file.

-- Jim

-----Original Message-----
From: theora-bounces at xiph.org [mailto:theora-bounces at xiph.org] On Behalf
Of Maik Merten
Sent: Thursday, September 27, 2007 1:10 PM
Cc: theora at xiph.org
Subject: Re: [theora] ignoring audio in player_example

Hi Jim,

in general for Theora-only playback I'd advise looking at dump_video.c -
that one does take care to only process Theora streams.

I haven't looked closely but I guess just disabling the Vorbis header
check may result in Vorbis data later on getting stuffed into the Theora
decoder - albeit in your case I guess the decoder may have some PowerPC
related problems.

Maik


Mayer, Jim schrieb:
> I'm interested in ignoring the audio stream in a theora encoded file. 
> My first attempt was to remove the test for vorbis:
> 
>  
> 
>       /* identify the codec: try theora */
> 
>       if(!theora_p && theora_decode_header(&ti,&tc,&op)>=0){
> 
>         /* it is theora */
> 
>         memcpy(&to,&test,sizeof(test));
> 
>         theora_p=1;
> 
>       }else if(!vorbis_p &&
vorbis_synthesis_headerin(&vi,&vc,&op)>=0){
> 
>         /* it is vorbis */
> 
>         memcpy(&vo,&test,sizeof(test));
> 
>         vorbis_p=1;
> 
>       }else{
> 
>         /* whatever it is, we don't care about it */
> 
>         ogg_stream_clear(&test);
> 
>       }
> 
>  
> 
> I simply commented out the "else if (! vorbis_p &&" line.
> 
>  
> 
> Unfortunately, the resulting executable displayed a green rectangle
and,
> when interrupted, crashes.  Clearly I am doing something very wrong!
> 
>  
> 
> Any thoughts?  I'm quite new to Theora.
> 
>  
> 
> Thanks.
> 
>  
> 
> -- Jim
> 
>  
> 
> 
>
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> 
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