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| mmarvi |
| Posted: Sep 24 2002, 10:01 PM |
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I have a couple of VHS tapes of sporting events that I got from Germany. I can tell that they were originally in PAL format because the framerate appears to be slower (probably 25 FPS). My question is, if I capture these videos into VirtualDub, can it change the framerate back to 30 FPS so that playback will appear more "normal"? |
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| fccHandler |
| Posted: Sep 25 2002, 03:59 AM |
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Administrator n00b
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The question leaves me confused. I am in the U.S. (NTSC) and I had always understood that if I obtained a video tape recorded on PAL equipment then I wouldn't be able to play it on my VCR. If that's true, then the tape you got has already been converted to NTSC, or you wouldn't have been able to play it. In that case, the more appropriate question might be whether it's possible to restore the original PAL 25fps video from the converted NTSC version, but in my experience it's not usually possible. My advice then is to capture the videos at 29.97fps, and treat them just as you would any other NTSC recording.
BTW, if your eyes can tell the difference between 25fps and 30fps in real time then you are truly gifted, IMHO. 
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May the FOURCC be with you... |
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| Sarreq Teryx |
| Posted: Sep 25 2002, 05:20 AM |
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VirtualdubMod Alpha tester
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| QUOTE | | I am in the U.S. (NTSC) and I had always understood that if I obtained a video tape recorded on PAL equipment then I wouldn't be able to play it on my VCR. If that's true, then the tape you got has already been converted to NTSC, or you wouldn't have been able to play it. |
unless he has a worldwide capable VCR, very expensive things. If you do, and you're able to get your capture device to accept PAL signals, just leave it like that, there's nothing that can be done to raise framerates of the same type (interlace to interlace or progressive to progressive), except to add duplicate frames, which will still make it look exactly as it did in the source tape. and besides, it'll compress at with better quality (or lower bitrate, your choice) with the lower framerates.
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And as I walk through the Valley of the Shadow of Death, Lord, thy balls and shaft, they comfort me, you annoint my head with oil, some salt, a dash of pepper, a sprigg of parsley......Lord?............Lord??? What dost thou intend to do with that fork??? |
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| mmarvi |
| Posted: Sep 25 2002, 10:01 PM |
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Isn't there some way to increase the frames per second in the captured file to 30 FPS, maybe by simply making it play faster? BTW, note to fccHandler, it's kinda easy to tell the difference between 25FPS and 30FPS, its kinda like the difference between film, which is 24FPS, and live TV, which is 30FPS. The tapes I mentioned simply look a little slower, and I'm sure its because they were originally in PAL format, and I'm pretty sure they were converted to NTSC before I got them. |
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| John Cline |
| Posted: Sep 30 2002, 08:42 AM |
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NTSC <> PAL conversion is actually fairly complicated. Not only are the frame rates different (25 PAL vs. 29.97 NTSC), but the number of scanlines are different as well. NTSC has 525 of which 480 are active, PAL has 625 of which 576 are active. Both PAL and NTSC are interlaced, so it isn't just a simple matter of resizing the video frames to either 480 or 576. The conversion can't be done using Virtual Dub. However, the new Canopus Procoder software does a pretty reasonable job of converting between formats. Of course, Procoder isn't free.
John |
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| SynchronousArts |
| Posted: Sep 30 2002, 08:14 PM |
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| QUOTE (John Cline @ Sep 30 2002, 12:42 AM) | | ... Both PAL and NTSC are interlaced, so it isn't just a simple matter of resizing the video frames to either 480 or 576. The conversion can't be done using Virtual Dub. However, the new Canopus Procoder software does a pretty reasonable job of converting between formats... |
If we're not doing any temporal interpolation, then an interlace savvy resize can be used. The built in resize in VirtualDub can be used here but is not recommended for enlargement according the interface.
What is procoder doing to convert frame rate? Adding/Dropping or Interpolation? Does it perform automatic audio timing?  |
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| Morsa |
| Posted: Oct 22 2002, 01:48 PM |
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Moderator of the Vdub support board
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Try using avisynth, a script to convert between PAL and NTSC was published at Doom9's forum
Hope it helps.
Also you may try an utility by DVFilm called Atlantis.
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| sasha |
| Posted: Oct 25 2002, 07:10 AM |
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Converting VHS tapes pal<->ntsc is fairly simple. I do it right now on my pc desktop. The quality is much better compare with "international" VCR's, which have hardware convertors. Actually I'd say it is a "professional" quality, because I cannot distiguish it from original.
But you have to have 1) video player wich can read pal tapes
2) capturing card with ability to input video in PAL and output analog video in NTSC format.
I use PAL videocam (in VCR mode), which I brought from Europe many years ago. Try to rent a player somewhere, for example.
The capturing card is matrox gl450, for example. It has PAL/NTSC input/output
I capture VHS in AVI 480x576 25 fps, using virtualdub (because then I use it for SVCD), but you can use a different resolution as you want.
Than deinterlace (bob in avisynth), edit avi (adobe premiere). Play it back on windvd (you can find tial versionon internet), or compress with tmpgenc to mpeg-2 for svcd, and record through analog output of gl450 to your NTSC VCR.
BTW, dvd player does not distiguish PAL or NTSC SVCD, it plays both formats on NTSC monitor.
I even, record it on miniDV cam so I convert PAL to miniDV also and can later edit DV tapes. But it is optional, if you have minidv cam. The quality is noticable better.
It's simple and quality is perfect.
Good luck |
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| Morsa |
| Posted: Oct 25 2002, 04:41 PM |
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Moderator of the Vdub support board
Group: Moderators
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You cannot convert PAL to MiniDV because of a simple fact.
MiniDV has both formats: PAL for Europe and South America (Different flavors PAL-N, PAL-M, PAL-B, etc) and NTSC.
So you can record PAL or NTSC regardless of media (DVCAM, MiniDV, DigiBeta, BetaSX, etc)
Hope this is useful. |
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| sasha |
| Posted: Oct 26 2002, 02:15 AM |
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But you can convert your AVI to MiniDV regardless what was the source of this AVI
So, there are a few ways to make a conversion and have good result the (PAL video on NTSC monitor). For example,
1) VHS PAL tape on PAL video player-> Capturing card ->AVI -> Bob->Adobe Premiere->AVI->MPEG-2->SVCD->DVDPlayer->NTSC monitor or analog output to NTSC VCR
2) VHS PAL tape -> Capturing card ->AVI -> Bob->Adobe Premiere->Converter AVI-to-DV->MiniDV cam connected through fire firewire
Or
3) VHS PAL tape on PAL video player-> Capturing card ->AVI -> Bob->Adobe Premiere->AVI->WinDVD->Dual head capturing card->NTSC monitor or analog output to NTSC VCR
No problem. Just do it. I convert my old family PAL VHS tapes here, sitting in Canada |
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