video - IMFByteStream QueryInterface to get IMFAttributes -
i wanted open video file using imfsourceresolver
returned byte stream type of given url unsupported. did open video irandomaccessstream
, convert imfbytestream
, use createobjectfrombytestream()
imfmediasource
.
according link createobjectfrombytestream says if mf_e_unsupported_bytestream_type
returned specify mime type setting mf_bytestream_content_type
attribute on byte stream. link mf_bytestream_content_type says attribute value, query byte stream object imfattributes
interface. not figure out how that.
is possible imfattribute
interface imfbytestream
? if how? , should values mf_bytestream_content_type
?
from msdn (http://msdn.microsoft.com/en-us/library/windows/desktop/aa374773%28v=vs.85%29.aspx)
to find out whether byte stream supports attributes, query byte stream object imfattributes interface.
according info, byte-streams support imfattributes, others don't. if query imfbytestream imfattributes , returns e_nointerface mean yours doesn't.
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