Interlacing problems. Confusing??

[tarka1]

Hi all. I am extracting one big 4.7 gig mpeg2 file from a DVD recorded from the TV. I am using various programs to do this i.e tmpgenc DVD Author and then splitting up the file using tmpgenc 3 express. Job done. Problem is when i play back the original disc on the TV there are no interlacing problems. When i play back the original disc on the PC i get interlaced lines. Why?????
When i burn my mpeg 2 files to disc and play them back on the TV i also get interlacing. I cant understand why as the original file has not been re-encoded or altered, just split up. How can i get around this?

Many thanks guys........

[edDV]

Field split is normal on a computer monitor. You are seeing two fields displaced in time by 1/60 sec. You can view interlaced video on the computer with a deinterlacing viewer like PowerDVD, WinDVD or VLC*.

If the goal is DVD playback to the TV, keep all software in interlace mode and set tmpgenc DVD Author to encode an interlaced DVD. Best to make a test DVD (DVD-RW is easy) to make sure you have the settings correct.

* For VLC set deinterlace mode to BOB or mean. Note that you are deinterlacing only for the computer viewer. The video files should retain interlace.

[tarka1]

Thanks for the reply mate. The confusing thing is that if i keep all software set to interlace and burn the mpeg2 files as an iso the playback on the TV has interlaced lines. I cant understand why as they are effectively the same as the original disc??? Arnt they???

[edDV]

Thanks for the reply mate. The confusing thing is that if i keep all software set to interlace and burn the mpeg2 files as an iso the playback on the TV has interlaced lines. I cant understand why as they are effectively the same as the original disc??? Arnt they???

Normal television is interlaced with alternating fields (every 1/50 sec in PAL).

Is your TV a normal PAL CRT or something else?

What defect do you see? Is it possible to post a captured frame?

Are you seeing something like this?



or this?



These are examples of different motion distortions caused by deinterlacing.

[tarka1]

My TV is pal or NTSC. I think it detects automaticaly. And i think it auto detects interlace or deinterlace movies as it comes up saying which it is when i insert an original DVD movie.
Yes, playback of the mpeg 2 files looks exactly as it does when playing the disc on the PC. Horizontal lines during fast motion. But only after ripping, cutting and burning back to disc. But i havent re encoded the clips, just split them and then burnt them back as mpeg2 rather than vobs.

[rumplestiltskin]

You'll probably resolve the problem by running the file through TMPG Express first and "de-interlace" & re-encode there. Then run it through TMPG DVD Author and set the start/end point for the first part. Repeat the Author part but set the start/end ponts for the second half. (I'm assuming, based upon your post, that you "cut" because you can't fit the entire show on one DVD-5.)

[tarka1]

Hi mate, thanks for that i'll give it a go. Sorry, but i have another problem now. None of the tmpgenc products will recognise audio from either vobs ripped from dvd or mpegs ripped from dvd. I can load the vob into virtual dub and convert to divx or xvid e.t.c with full success, video and audio, but with the tmpgenc products i only end up with video when outputting to mpeg. I have litterally tried everything i can think of and cant fix it. Any ideas??

[tarka1]

Should probably tell you that what im doing is recording music videos from the tv and then keeping the ones my kids want by using the pc and burning them onto disc as mpeg2 files so that they are compatible with all players rather than bothering with authoring proper dvd's

[rumplestiltskin]

You might try ffmpeg or you may have to first de-mux the file and convert the audio separately. But do try ffmpeg first.

[tarka1]

Yeee Haaa! although i had the AC3 codec installed from the Kazaa lite codec pack i still had to install the AC3 codec that came with the tmpegenc 6 in 1 pack. Why, i dont know, but fixed it is. Still have the interlacing to deal with though Gonna have a look at the proggy you mentioned any way, never heard of it before and i like to mess about with new stuff. Thanks mate

[edDV]

I think the problem is back in your DVD recorder. It should be in interlace mode.

Normal TV (NTSC or PAL) is interlace. If you want to play it back to your normal TV you should be keep interlaced throughout the process to the final DVD. Any attempt to deinterlace along the way will degrade the picture in ways similar to the above.

The only exception is material that originated as progressive film, computer animation, or progressive HDTV. With proper care and procedure you can convert film, et. al. back to progressive and reinterlace without loss.

Somewhere in your process, you are deinterlacing your video and that is creating the motion artifacts you are seeing.

It would help if you gave the model numbers of your DVD recorder and TV.