Using WMASFWriter in a DirectShow filter graph generates a video which pauses at each keyframe interval
- From: Andrew Dodman <andrewcdodman@xxxxxxxxx>
- Date: Tue, 31 Jan 2012 03:37:35 -0800 (PST)
Hello all,
I am attempting to create a DirectShow source filter based on the
pushsource example from the DirectShow SDK. My source filter
essentially outputs a set of bitmaps, each of which typically lasts
around 600 milliseconds, to a video. I have set up a filter graph
which uses Async_reader with a Wave Parser for audio and my new filter
to push the video (the filter is a CSourceStream and I populate my
frames in the FillBuffer function). These are both connected to a
WMASFWriter to output a WMV.
What I am finding is that at times corresponding the keyframe interval
the video pauses for a second or two. This seems to be worse at HD
resolutions, thought that could be a red herring. What kinds of things
might be causing this? Is it related to how often I allow FillBuffer
to be called (my frame rate is 30fps, so I end up with the same bitmap
being repeated for several frames)?
Many thanks,
Andrew
.
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