[ogg-dev] Removing metadata segmentation

Andrew Taylor andy at benow.ca
Mon Jun 15 12:05:48 PDT 2009

ogg.k.ogg.k at googlemail.com wrote:
>> We're also doing scheduled metadata change to indicate the current show
>> to listeners.  So for a 4pm show a url is hit which causes icecast to
>> change the metadata indicating the 4pm show. That also works fine.
> And this causes segmentation because the metadata is stored in the
> second header of the Vorbis stream, so changing metadata will cause
> a new stream to be started, with the updated metadata. While such
> streams are valid, they are not, as you found, well supported. There
> is also no way to insert a Vorbis comments header packet within a
> Vorbis stream without starting a new logical stream (well, there is, but
> it would not be a valid stream, and would be ignored the decoder).
>> oggdec -o - metadata_segmentation.ogg | oggenc -o contiguous_metadata.ogg -
> This will lose all metadata, which you don't want. If you add again the
> metadata, it will apply to that single stream again.
> That said, Internet radio streams are usually handled fairly well by
> various players, which detect new streams and update metadata
> accordingly. These are typically live and not seekable though.
Thanks for the reply.

What I'm after is basically the conversion of a live stream to a 
seekable stream.  The metadata is known and a wipe and reset is 
possible, but is it possible to wipe metadata segements across the whole 
file without re-encoding?


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