No frame interpolation with 25fps video

I'm watching a tv series but I can't get SVP to actually execute frame interpolation. Here's the data of the video files.

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, RefFrames               : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 58 min 57 s
Bit rate mode                            : Variable
Bit rate                                 : 22.9 Mb/s
Maximum bit rate                         : 33.0 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : MBAFF
Scan type, store method                  : Interleaved fields
Scan order                               : Top Field First
Bits/(Pixel*Frame)                       : 0.441
Stream size                              : 9.42 GiB (92%)
Default                                  : No
Forced                                   : No

SVP is running at 50fps. So I would say that frames are interpolated to make 50fps out of 25fps, but SVP shows no activity at all. I've been altering many settings, to no avail. See attached file for my LAV video decoder settings. Should be good, but I've experimented with several settings for hardware decoder but nothing changes.

For the record, with normal 24fps files SVP works great. Just for these files SVP doesn't seem to kick in no matter what settings I change. So clearly I'm missing something. What I can make of it is that the video is seen as interlaced and somewhere in the chain it's deinterlaced to 50fps (despite my LAV setting for film mode) so SVP can't interpolate any frames. But I have no clue where I can change settings for this. I'm using MPC-HC 64-bit, Madvr and LAV filters.

Can anyone help me out here?