Why misc interlace artifacts by encoding occur ?

Could somebody tell me why misc interlace artifacts by encoding of movies occur ? I have never had any problems with encoding of PAL movies, but I encoded only a few NTSC movies without problems. There is a lot of NTSC movies that I am not able to encode right without having any interlace artifacts in movies. If I choose Force Film or IVTC, try different settings, all the time somewhere else misc interlace artifacts in the movies occur. What is the purpose of this ? DivX ? DVD2AVI or what ? Do the same problems occur also with other encoding programs like FlaskMPEG and other ? And what if I use Xvid ? Thanks

Hi- There are lots of reasons that might occur. It might not have been telecined in the first place, and you shouldn't Force Film or IVTC. Sometimes with badly telecined DVDs, the default values for Decomb aren't strong enough, and you'll have to tweak them a bit. You can find out how in the Decomb help file. And sometimes, no matter how you tweak it, you can't get rid of all of the interlacing. One way to be sure of getting rid of all the interlacing (if you're using low enough of a resolution) is to do something like this: SeparateFields().SelectEven() Decimate(5) #if originally film material But that's only as a last resort.

Do the same problems occur also with other encoding programs like FlaskMPEG and other ? And what if I use Xvid ?

Hi- I can't comment on Flask, since I don't use it. But these problems can occur anytime you use an .avs and have a bad DVD as source material. I have these problems all the time with PAL movies converted for NTSC, and also bad Hong Kong or Japanese movie transfers. So switching to XviD won't help. It does have an option to keep it interlaced for viewing on a television, but I'm not sure I'd recommend doing that. Try this and see if it helps. If performing IVTC: Telecide(threshold=5,dthreshold=5).Decimate(5) And if only deinterlacing: FieldDeinterlace(threshold=5,dthreshold=5) Good Luck.

Thank you very much, I'll try both when I will have a little bit more time. Could you also tell me how it is possible to deinterlace some places in the movie manually ? I have read Decomb help file maybe 15 times, but I don't understand "Overriding Decomb Decisions". Do I have to do this after encoding my movie or by encoding ? Where do I have to put the script file ? Thanks

Hi- I forgot to mention the Guide feature in Decomb. When performing IVTC, it's a good idea to use: Telecide(Guide=1).Decimate5) And if that doesn't work, then maybe try: Telecide(Guide=1,Agg=true).Decimate(5) That one has worked several times for me to clean up stray interlacing. And if it's still no good, then put the deinterlacer on more strongly: Telecide(Guide=1,Agg=true,threshold=5,dthreshold=5).Decimate(5) neuron2 (the developer of Decomb) doesn't much like the Agg=true setting, and prefers to use the mm setting, but I haven't experimented with it. As for the override file, I tried it only a couple of times and found it to be more trouble than it's worth. But if you can find the places that remain interlaced before encoding, then you can setup the override file before encoding. If you don't find the interlacing until you're going over the finished .avi, then you can set up an override file and run the second pass all over again. The override file remains in the same movie folder and is named something like "movie.tel" (just a text file renamed as .tel). Then you have a line in the .avs script like: Telecide(ovr="movie.tel") And inside the movie.tel file you have stuff as shown in the Decomb help file that forces field matches differently than if Telecide had done it alone. If you want to force different frames to be dropped (which can be useful to get rid of the troublesome interlaced frames), then you make a movie.dec file with the frame numbers that you want dropped, and make this line in the script: Decimate(ovr="movie.dec") But like I said, a real pain in the ass to set up.

Thanks a lot.

Hi, I am back again. I tried all your settings but without any good result so I start to play with it a little bit. I encoded the movie maybe 15 times and I can say that I learnt a lot about how different settings affect the quality of the movie. After a week of encodings ad re-encodings with different settings I found out the solution. I putted "reverse=true" to Telecide function and I've got the perfect DVD Rip.

Hi- Good, I'm glad you got the problem solved. And thanks for posting back with the answer. It may help the next guy with a similar problem. And it may help me to give the right answer next time. :)