Vorbis - Apr 2004 - Servlet streamed Ogg skips

I am writing a J2EE servlet based web application that delivers streamed 
audio from a database.  In response to a web request it responds with an 
M3U file containing a link back to a servlet that delivers the audio.  I 
am testing this with WinAmp configured as the media player.

The browser properly starts WinAmp which then sends the correct request 
for the audio.  My servlet responds with a properly tagged MIME type and a 
filename with the proper extension to indicate if the content is in MP3, 
MIDI, or OGG format.

For MIDI, WinAmp appears to suck down the entire file before it plays.  
This is ok, since MIDI files are pretty short.  For MP3 files WinAmp 
starts playing immediately, which is what I expect.  But when the HTTP 
ContentType is application/ogg  (which I understand WinAmp ignores) and 
the filename ends in ".ogg" (which WinAmp DOES look at) the behavior
is
different.

In the ogg case WinAmp starts playing immediately but it skip a lot. As 
though it is skipping packets or something like that.  The entire musical 
selection goes by at almost twice its notmal speed.

If I instead deliver the audio as a normal download instead of through a 
M3U file then WinAmp plays ogg content correctly.  But in that case the 
browser is downloading the file before starting WinAmp and so there can be 
quite a delay, which I am trying to avoid.  I also want to keep track of 
partial plays, which I can only do in streaming mode.

Is this a WinAmp problem or is there something I don't know about ogg 
streaming?  The same pice of code handles all three file types; it just 
copies the bytes from the database to the response output stream (if you 
are familiar with the HttpServlet java class and its methods).

So what am I missing here?
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> In the ogg case WinAmp starts playing immediately but it skip a lot. As
> though it is skipping packets or something like that.  The entire musical
> selection goes by at almost twice its notmal speed.
I'm not sure if this is the case, but it sounds as if Winamp is downloading
the Ogg file as fast as possible and just plays from the current download
position. Try to restrict the output rate from your servlet to the stream's
actual bitrate.

Tor

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On Saturday 01 May 2004 09:23, Tor-Einar Jarnbjo wrote:
> > In the ogg case WinAmp starts playing immediately but it skip a lot.
As
> > though it is skipping packets or something like that.  The entire
musical
> > selection goes by at almost twice its notmal speed.
>
> I'm not sure if this is the case, but it sounds as if Winamp is
downloading
> the Ogg file as fast as possible and just plays from the current download
> position. Try to restrict the output rate from your servlet to the
stream's
> actual bitrate.
>
I really doubt this is the case - I've never seen winamp behave like that.

What the actual problem is I don't know... This sounds like it _should_ just
work.

Mike

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