why the quality in fast-motion scene isn't low, it's really BAD

Hi, I'm in trouble, I have Western Movie from DVD, DVD source is NTSC FILM Progressive and I had chosen Force Film during I made .d2v. Then I encoded .mp4 file with x264 codec in MeGUI (High Profile - Insane Quality) 1900Kbps (high-bit rate) 720x480 with EQM AVC-HR Metrics, the result is and here It happens only on fast-motion scene, but the quality is great on slow-motion scene, but my movie isn't action movie, fast-motion scenes aren't much. So, should I increase bitrate? (that time I used 1900kbps) Normally, even with XviD codec, 1400Kbps is good enough, maybe with XviD codec, the detail is not much in fast-motion scene but, with x264, the fast-motion scene become interlaced, (I compared my .mp4 in Media Player Classic with .avs in VirtualDub, the quality from vob is good why the final mp4 is bad?). I think the problem is involved with x264 AVC codec, not MeGUI so I put it here.

I managed to see the screenshots (they don't show up in post unless you've been to imageshack and have them in cache) and I see no compression artifacts. Do you refer to interlacing here? 'cause I see interlacing.

Using ForcedFilm in DGIndex only works out when the pulldown pattern is "perfect" throughout all of the movie. If the pattern isn't fully consistant, ForcedFilm will result in what you have there. Make a new d2v without ForcedFilm, and do a manual IVTC per Telecide+Decimate (Decomb package of neuron2) or TFM+TDecimate (TIVTC package by tritical).

In general, by default Decomb (not Decomb TIVTC) is faster and TIVTC is higher quality and has less problems with bad sources. TIVTC can be made faster (and less robust), and basically it's a lot more tweakable than Decomb. For most movies either one will do fine with default settings.

I don't think so please read my new post here The result of testing Deinterlaced modes.

Revgen might be onto something there... it looks to me like an IVTC was performed before encoding to DVD, which had some bung frames. that's why you've got 100% film - the bad matches are in a 23.976 fps stream that's been pulled down with something similar to DGpulldown or pulldown.exe (which just inserts the soft-telecine flags into an mpeg-2 stream).