[vorbis-dev] Ogg Vorbis DirectShow decoder filter - ongoing development ?

[Christian HJ Wiesner]

Hi,

ome of you may know me, i am one of the project admins of a video 
related opensource project. For playback of Vorbis audio tracks in 
movies, if being played on M$ via DirectShow, we are currently using the 
Vorbis decoder filter from Tobias Waldvogel. However, we found out that 
this decoder filter is not acting DirectShow compliant with respect to 
handling of timestamps. When passing the data from the Ogg/OGM 
parser/splitter filter this is no issue as both are probably synced very 
well internally, but if the filter shall be used from other splitters 
such as AVI/MP4/MPEG, problems will occur.

The purpose of this email is to find out if there is any ongoing 
development for a new Vorbis decoder filter for M$ DirectShow, which 
will be more compliant with respect to timestamp handling. If this is 
the case, we would be glad to contribute. If this is not the case, we 
will consider writing a new decoder filter, being open source but under 
a GPL license ( we will reuse code from other GPL filters as basement ). 
Please note that due to time constraints we dont have plans to write an 
opensource Ogg splitter/parser also, nor do we have plans for an Ogg 
muxer filter.

Thanks for telling us if there are any plans into this direction or not.

Best regards

Christian

P.S. We are also talking to Ingo Ralf Blum, the developer of the MediaXW 
DShow filter package, the first working Vorbis decoder filter ever, to 
find out if his filter could be an alternative.

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