[HELP] 25i to 29.97i with interpolation

[Miranda]

Just a black screen preview.

[Selur]

Okay (libav has problems with some hevc interlaced content):
Try enabling hardware decoding, assuming you have a intel or nvida gpu. Set 'Libav hardware decoding mode' to 3.
If you have an NVIDIA GPU you could alternatively enable 'Use DGDecNV when available'.

Cu Selur

[Miranda]

OK thanks, will try that. Where is the hardware decoding setting?

[Selur]

"Filtering->Vapousynth->Misc->Source->Libav hardware decoding mode"

[Miranda]

Sadly this did not work either, so converting original file to ProRes.

[Selur]

Okay, that is curious, since if the hardware decoder can't decode it no normal Player should be able to playback the file either.

[Miranda]

I think the problem may be to do with the pixel aspect ratio, which is .9141. I have no idea why it has been squeezed, when it is a 4x3 image. perhaps it has been flagged incorrectly as anamorphic?

[Selur]

you can overwrite the input PAR through: 'Crop/Resize->Base->Pixel Aspect Ratio (PAR)->Input PAR'

I think the problem may be to do with the pixel aspect ratio, which is .9141.

that sound wrong, see: https://forum.selur.net/thread-597.html

Cu Selur

[Miranda]

What should I overwrite the PAL 4x3 PAR to?

[Selur]

Typicallly DVDs and oder MPEG-2 content uses generic PAR:

Generic:(common for MPEG-2 based content)

DAR	PAL	NTSC
4:3	16/15	8/9
16:9	64/45	32/27

so for 4x3 content 16/15 is the usual PAR I would expect.

Cu Selur