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

[StephenChow]

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
http://img224.imageshack.us/img224/8191/snapshot200606241303181gu.png
and here
http://img209.imageshack.us/img209/8062/snapshot200606241306588ww.png
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.

[sysKin]

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.

[StephenChow]

Do you refer to interlacing here? 'cause I see interlacing.
Actually the source is DVD Progressive, and it has 3:2 pulldown already, after encoding, the fast-motion picture is bad, as it looks like interlaced frame, but not much frame like that. The slow-motion is good. If I use XviD encoding, the detail on fast-motion 'll lost, but not look like this.

[Didée]

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).

[StephenChow]

Sorry, I was wrong, I would inform you that the source from DVD is also "interlaced" liked that.
I followed the guild here: http://www.doom9.org/mpg/dgindex.htm .It said that when Frame Rate is 29.97, Video Type is Film (or Film>95%) and Frame Type is Progressive, turn Honor Pulldown Plags to Forced Film. In my case, Video Type is Film (it doesn't show how much percent, so I think it's FILM 100%)
I generated .d2v then, and create .avs with MPEG2Source, then I watched it on VirtualDub, I have a 3:2 Pulldown video with 23.976fps, and I watched it carefully, I noticed that every thousands frame, there is only 2-3 interlaced frames!!!
Thank you Didée, I followed your guild, create .d2v with Honor Pulldown.
When I tried Decomb TIVTC to IVTC'd the video, the result is good.
I don't know which is better, TIVTC or Decomb TIVTC?

[foxyshadis]

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.

[StephenChow]

I don't think so please read my new post here
http://forum.doom9.org/showthread.php?t=112794
The result of testing Deinterlaced modes.

[Revgen]

Hi,

I'm in trouble, I have Western Movie from DVD...

Where are the cowboys?:D

Hong Kong DVD's are typically not telecined correctly. You're better of just doing plain deinterlacing and decimation.

[Mug Funky]

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).