A question about pulldown

[Talayero]

Hi,

I've just encoded a NTSC movie using doitfast4u and CCE.

The source is film 23.976, progressive and bottom first.

I had autodetect ntsc type enabled in Doitfast4u. The encoded file was a NOPULL.mpv, that's to say pulldown wasn't made.

The encoded dvd is almost perfect but I think I see that the lateral movements when panning in movie are not totally fluent, as if some frame was missing now and then. It's hard to tell because it's just a slight issue, but if I compare the encoded dvd with the original one I think in this one the movements are more fluent.

I wonder If I can improve the encoding checking in Batchccews 2:3 pulldown, and I also wonder if a source like this one (film 23.976, progressive, bottom first) needs really a pulldown or not.

Thank you in advance

[jagabo]

23.976 fps progressive without pulldown flags is not valid for DVD. Your DVD might play it but it may also have problems -- like you seem to be seeing. Add pulldown flags and the problem should go away.

You want to encode as 23.976 fps progressive frames with pulldown flags. You don't want the software to perform the pulldown and encode as 29.97 fps interlaced frames.

Note that a progressive source is neither TFF nor BFF. It's simply progressive.

[Talayero]

Thank you for answering.

I wonder why doitfast4u has encoded this movie as 29.976 fps. It's clearly film 23.976 fps. Maybe it got confused because at the beginning of the film there's a couple of logos that are video at 29.976. But that's weird, because a lot of films have these introduction logos and that would mean that doitfast4u get it wrong a lot of times.

I don't know if I understood you well. You said adding pulldown flags (I guess using PullDownBatchFE Beta 1.1 that I have in my computer) could fix the problem, but the movie is already encoded as 29.976. So I think I should encode it again as 23.976 and then use dgpulldown.exe to perform the pulldown. Is that right?

I didn't know or didn't remember that a progressive source is neither TFF nor BFF. I just read what Bitrate viewer and DGIndex said: progressive, bottom first, but probably that means nothing beeing a progresive source, as you said.

[guns1inger]

Open it in g-spot. If it is 29.970 then g-spot will give a pic/s as 29.970 and fps as 29.970. If you get pics/s of 23.976 then it was encoded correctly and pulldown added. Many programs see 23.976 with pulldown as 29.970 fps.

If it is encoded as 29.970 fps then yes, you should re-encode at 23.976 and add pulldown. I would use DGPulldown for this.

[Talayero]

Thanks. I opened a vob of the film in g-spot and says pics/sec: 23.976 and Frames/ sec :29.970.

So, if I'm not wrong, that means is 23.976 and I must encoded it again as 23.976 fps and perform pulldown later with dgpulldown

[guns1inger]

It is already 23.976 with pulldown, so you gain nothing by re-encoding.

Jerky pans and zooms can also come from playing NTSC videos on PAL equipment if the PAL setup is configured for native NTSC playback. All of my PAL gear (I am in a PAL country) plays back PAL, NTSC as PAL, or NTSC as native NTSC. Some of my players will play back NTSC as PAL quite smoothly, others produce jerky results. I always have everything configured for playback in the same format as the source - PAL is PAL, NTSC is NTSC.

[Talayero]

I think I didn't explain it well before.

The vob I opened in g-spot was from the original film, that is, as you said, 23.976 with pulldown. But the encoded one that I open now in g-spot is pics/sec: 29.976.

So, I must reencode the original again, must I? To reencode as 23.976 and then dgpulldown.exe

[guns1inger]

Yes. Sorry - mis-understood that you were talking about the source. You are right - re-encode at 23.976, add pulldown, author away.

[manono]

Or use DVD-Rebuilder which doesn't allow you to screw up like that. It'll give it back to you just as it is on the original retail DVD. If there's an interlaced logo, you'll get back an interlaced logo. If the main movie is encoded progressively, that's how the reencoded result will turn out.