IStreamBufferMediaSeeking setPosition doesn't seem to render

Question

I have created two DirectShow graphs. One captures from a Hauppauge HD-PVR and stores it in a StreamBufferSink. The second one uses a StreamBufferSource, sends the output to an MPEG-2 Demultiplexer, sending the video to the ArcSoft Video Decoder and on to a Video Mixing Renderer 9 set up in windowless mode.

This all works fine for previewing the data. When I use the IStreamBufferMediaSeeking.SetPositions method (getting the interface from the StreamBufferSource) to change the playback position, if I set it anywhere but at the beginning of the stream, the video freezes and stops updating. Calling GetCurrentPosition on IStreamBufferMediaSeeking shows the position is moving on the stream, but the video just doesn't follow along.

I am using C# and DirectShowLib-2005 for programming things.

Any ideas on what is wrong or how to figure out what is going wrong?

Thanks,

- David

Answer 1

What I have discovered is the StreamBufferSink/StreamBufferSource only understand MPEG-2 or DV video. H.264 is not supported so it doesn't know how to seek within the stream and thus I cannot use this component for what I want to do unless I transcode my stream to MPEG-2 which defeats the purpose for having an H.264 stream in the first place.