IVTC (29,97 NTSC Laserdisc to 23,976) with ffmpeg runs too fast

[Gwar]

hello guys,
For proper editing in my video studio (DaVinci Resolve). I need to Inverse Telecine the video.
(sample: https://workupload.com/file/mjMXcMpuEPs)

As far as I read through several documentations the proper way of doing it is supposed to be

"%FFMPEG%" -i %INPUTFILE% -vf "fieldmatch,yadif=deint=interlaced,decimate, fps=24000/1001" -b:v 30M -maxrate 30M -bufsize 30M "%TARGETFILE%".mov

If I leave out the bitrate commands the video comes off very small with a bitrate unter 1000.
Usually for simple copying the video without any conversion commands ( -c:v copy ) ffmpeg choses a fitting bitrate but in this case it didn't so I just chose big parameters to minimize the quality loss.

If I leave out the " fps=24000/1001" at the end the video comes out with a weird 47,xx fps.

So all in all although in the right fps and good bitrate the video still plays ways too fast so what am I doing wrong here ? There don't seem to be many other ways for a proper IVTC in ffmpeg.
Any help is much appreciated.
thanks a lot
regards

[jagabo]

I was able to duplicate the problem with your source video. MPEG2 video in MKV is often problematic so I remuxed the source to an mpg file then ran the IVTC on the new file. It worked properly.

Remux batch:

ffmpeg -i %1 -vcodec copy -acodec copy "%~dpn1.mpg"

For some reason fieldmatch produces 59.94 fps with the MKV source, 29.97 fps with the MPG source.

[poisondeathray]

ffmpeg reads the frame rate as the field rate (59.94)

    Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, smpte170m, top first), 720x480 [SAR 8:9 DAR 4:3], Closed Captions, 59.94 fps, 59.94 tbr, 1k tbn, 59.94 tbc

Another way to address this without demuxing is to use -vf fps before fieldmatch,decimate. This resets the input timestamps to the proper 29.97 (30000/1001) before fieldmatching

-vf "fps=30000/1001, fieldmatch,yadif=deint=interlaced,decimate"

[Gwar]

thanks a lot guys, you rule !