I am using Media SDK 2014 for Clients (x64) and am working with the Video Processing sample (sample_vpp) with hardware 1.7. I have inserted a few printf's but the sample code is basically unmodified. I'm trying to IVTC a 30 fps DVD source to progressive 24 fps via this command line:
-lib hw -sw 720 -sh 480 -scc yv12 -sf 30 -spic 0 -dpic 1 -dw 720 -dh 480 -dcc nv12 -df 24 -i telecine_dvd_yv12.raw -o nv12_vpp_ivtc.raw
sample_vpp does do IVTC, and does drop frames to get to 24 fps, however it seems to drop the wrong frames. As I step through output (24 fps) every 4th frame is a duplicate.
If letters represent fields, and frames are comma separated, here is a 2:3 pulldown frame pattern: AA,BB,BC,CD,DD,EE,...
After unblending but before decimation the frames might be: AA,BB,CC,DD,DD,EE,...
And I would think that one of the DD's would get dropped. However it looks like EE (base-0 frame #5) gets dropped. So rather than dropping an unblended duplicate frame, a good frame is dropped. The dropped frames are base-0 indices 5,10,15.
Is IVTC supposed to drop (frameIndex % 5) == 0 or is it supposed to drop the unblended duplicate frame?