[vorbis-dev] Streaming Considerations.
xiphmont at xiph.org
Mon Jul 31 11:13:03 PDT 2000
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I'm replying to two messages.
Adam Scriven (scriven at lore.com) wrote :
> I was thinking about this streaming thing again (thankfully, not about the
> info stream, but the audio stream. 8-) ), and I was wondering if it would
> be streamable like MP3, or more like Real Audio. MP3 players, like WinAMP,
> can stream without a special server. This may not be as reliable,
> streaming over HTTP, but it is quite handy. Will this be possible with
> Vorbis (dependent on the plug-ins)? And, if it IS possible, it should also
> pre-buffer the next coming song, if possible, so that the audio stream
> pauses as little as possible between songs, similar to how WinAMP does it.
I don't see any reason why OGG-vorbis could not be streamed over HTTP
or any other TCP based protocol.
I streamed mp2 over FTP ages ago and it worked just fine.
Peter Shore (peteshore at home.com) wrote :
> Having work extensively with Windows Media and its player control for
> embedded objects, I was wondering very much the same thing.
> Something many people don't realize is that even using just the http
> protocol, there are radical differences in streamability between file
> formats. Compared to ASF audio/video, MPEG audio/video streams poorly
> and unreliably. The former is not cached at all on a hard drive, but
> downloaded direct to memory - usually with just enough data to maintain
> a 5-second buffer. MPEG audio/video, on the other hand, is read only
> from a hard drive cache.
If this happens, then you have a bad or misconfigured mp3 player or www
You can stream MP3s over HTTP with WinAMP with no problems. A 10 hour
starts playing after a few seconds ( when enough data is downloaded to
the buffer ) and then plays nicely to the end.
> In terms of practical consequence, at modem bitrates a large MP3 encoded
> at 20k can take a full minute to begin playing via any protocol, whereas
> a 20k ASF/WMA file will begin streaming within seconds. At broadband
> bitrates, a 160k ASF will stream much more reliably than a 128k MP3 -
> and is far less prone to interruptions due to temporary bandwidth
> drop-off, and to flutter due to competition for computer bus resources.
You are probably seeing the difference between an UDP based transport
TCP based one. ( TCP sucks for radio type transmissions/broadcasts ).
> So I'm hoping that OGG, unlike MP3, is a non-cached file type like ASF
> (& which can also be a strong security feature for artists wishing to
> stream original content).
Again , this is not dependent on the file format , but the used
> In the long term, streamability plus adaptability to multichannel audio
> (beyond just 2-channels), are what I think will be the most important
> factors in the success of any format. An embeddable player object and
> control (or compatibility with an existing audio/video player like Real
> or MPlayer), I think are also very critical.
> Haven't seen much discussion addressing any of that.
> - Peter
P.S.: I am not subscribed to the list , so this mail may not appear on
unless Monty blesses it ( hint-hint :-)
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