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wadrwadr
Beginner
78 Views

Media SDK Mpeg 2 dshow filter sample decoder with not standard resolution

Hello,

I'm using sample mpeg2 directshow decoder filter from sdk 3.0 beta ( software decoding mode, never tried hardware mode) .

My problem happens with a video which has a resolution of 604x304.

Video Render filter (VR, VR9, EVR) shows video frames with an aspect similar to 4:3 but in fact should be similar to 16:9.

So after doing some debug at the decoder source code I found in CDecVideoFilter::RenewSampleParams method that VIDEOINFOHEADER2 is received with incorrect information, struct comes with dwPictAspectRatioX = 1 and dwPictAspectRatioy = 1 (but should be dwPictAspectRatioX = 2 and dwPictAspectRatioy = 1) and that produces the behavior explained above.

I need some help about what's happening, and detect where the values are wrong filled (linked library,??) of course I can override the values manually inside the method (which actually works ) but it's a patch that I would not like to do unless there is no other option.

I tried with a similar video (604x304) but encoded with h264 and it displays correctly with VIDEOINFOHEADER2 filled ok (dwPictAspectRatioX = 2 and dwPictAspectRatioy = 1) also others mpeg2 decoders ( like Microsoft DTV-DVD Video Decoder ) works ok.

Thanks in advance

Walter

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IDZ_A_Intel
Employee
78 Views

Double post. Please see the below thread for continued discussion
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