Pro 17 capture frame rates

Leon-Zetekoff wrote on 9/23/2023, 12:53 PM

Using Vegas Pro 17. I have a Canopus 300 external device via firewire on W10.

I noticed I can change the frame rate on video capture but it always captures at 29.97 - I've been trying to capture my SD video at 59.94 to get rid of the interlace artifacts. I've done this with OBS but was trying to see if I could stay self-contained in Vegas.

Am I wasting my time and just capture in OBS and be done with it?

Thanks leon

Comments

mark-y wrote on 9/23/2023, 1:07 PM

Your capture from the Canopus will be at native frame rate, 29.97i.

The conversion to 59.94p, aka "Bobbing," is done after the capture in an editor. This could be done in Vegas, HOS, VirtualDub, Handbrake, or another program.

Schemes that try to convert to Progressive on-the-fly during capture are usually very lossy and rely on frame blending, not field interpolation, I don't recommend them. OBS does not capture the DV25 digital bitstream, it is a screen recorder.

Leon-Zetekoff wrote on 9/23/2023, 1:33 PM

Hi Mark...thanks for the prompt comeback. I should have mentioned my composite feed goes into the Canopus and then back out to a Geniatech HD-CAP X2 USB capture device. It has HDMI and USB which goes into the PC besides the Canopus firewire. So OBS is capturing composite. Even though the Canopus driver is in the OBS dropdown it never seems to be able to use it.

Ok I will make some tests the way I am doing it now and using the built-in schemes in vegas and see how they fair. We're still dealing with 240-300 lines from tape. It will be interesting to see once I try digitizing my DIgital 8 tapes once I'm done with my VHS/S-VHS stuff.

Thanks, Leon

mark-y wrote on 9/23/2023, 2:33 PM

If you're only able to capture composite from the camera, not FireWire, you shouldn't need the Canopus in the chain, unless I'm missing something.

IDK what your USB device outputs, but it's not virgin DV25.

Leon-Zetekoff wrote on 9/23/2023, 5:17 PM

ok the canopus is fronting the capture device since the canopus stabilizes the video (1 line) - it doesnt like the raw output of the VCR. The i'm using right now a SVHS vcr feeding composite to the canopus and the canopus feeds composite to the capture device.. OBS takes in the capture on USB. I have been outputting MKV files. No way to create a .AVI.

When I connect the camcorder it will be via firewire and probably through the canopus as well to make any minor adjustments if necessary. I could try the camcorder right into the PC on firewire.

whats the best way to deinterlace? What I've done on vegas is create a project @ 59.94 progressive and capture into that.

Thoughts Mark?

Many thanks, Leon

mark-y wrote on 9/23/2023, 6:01 PM

Since I've never captured video through two devices the way you described, I don't have a good answer for you.

You are welcome to upload one of your short captures to Drive or Dropbox, where someone can test them in Vegas, but I suspect that the possibility of true Bobbing (29.97i -> 59.94p via field doubling) has been preempted by your composite capture device.

Leon-Zetekoff wrote on 9/24/2023, 9:08 AM

the geniatech says it can do all that but I'm using OBS to import and the only output formats on OBS are

here is the drive properties for the Geniatech device

here are the video properties on OBS - I can change it to 29.97 as well

i'm not interested in using the built-in feature of recording to a SD card and then importing that on the HD-CAP X2 device.

Vegas capture puts the captured file as an .AVI which is fine and that looks good. Whats the best way to deinterlace it in vegas?

If we can get OBS to output a .AVI that would be nice but I would expect that if I capture there at 30fps I should still see interfaced video and I believe I have previously. The Vegas capture, I think, looks to me sharper just want to get rid of the venetian blinds from the interlacing.

Thanks for bearing with me. I can see i can put some files up, getting ready for Yom Kippur here today.

Leon

Leon-Zetekoff wrote on 9/24/2023, 9:50 AM

I put a bunch of stuff up on google drive here

https://drive.google.com/drive/folders/1wAB2M5_3ZtmJBR-1W-6tsHOJR0FByBE8?usp=sharing

see if you can get to it

i have other video that has more motion - from my quick look this morning I believe these are all interlaced?

thanks leon

DMT3 wrote on 9/24/2023, 9:56 AM

Do you have a firewire card in your computer? If you do, the captures will be MUCH better, even the analog ones. For the digital 8 tapes, it will be zero loss, and for the analog it will be minimal. Right now you are converting the analog tapes at least thrice, once to DV and then again to the format the Geniatech box uses and then the OBS format.

Leon-Zetekoff wrote on 9/24/2023, 9:57 AM

yes I do thats how its getting to vegas, I am up for that just want to make sure I know how to deinterlace it on the vegas side

 

mark-y wrote on 9/24/2023, 11:30 AM

I have requested access to your files. There is a setting in Drive to allow access to to "Anyone With the Link" if that interests you.

Leon-Zetekoff wrote on 9/24/2023, 1:06 PM

hi mark I got your request. Thanks

mark-y wrote on 9/24/2023, 2:24 PM

I'm pleased that you captured one of your files in native DV25, and I can help you with that file [Newslink-Vegas-30fps-720x480.AVI] in Vegas to produce very good deinterlaced 59.94p via field doubling. Pretty simple with the right source. Please feel free to ask questions rather than try to second-guess the instructions. These were done in Vegas Pro 18.

Here is the finished 59.94p file for download.

https://drive.google.com/file/d/152BuhlO85njzp6gmOugvS__m6J6TsBM5/view?usp=sharing

The forum preview is limited to 30fps, unfortunately, but I added basic White Balance and Audio Normalizing.

Your other files (MKV) all have incorrect aspect ratios, are already deinterlaced (appear to use 'blend'), and the two you labeled "60 fps" aren't that at all, but frame-doubled 30fps (OBS only drops or dupes frames, it does not "change" or resample the native frame rate). Unfortunately, the changes have been baked in, making that approach impractical for what you said you wish to accomplish in Vegas.

Do you know about MediaInfo? It is a free utility that will give much of the relevant information about your files.

https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

Leon-Zetekoff wrote on 9/24/2023, 2:48 PM

Hi Mark...looks pretty good interesting if I put any of those files into VLC the "frame rate" jives but I see where you're coming from. I'll take a quick check before I have to stop for the holiday. Will get back to you by Monday evening or Tuesday. I'll just use OBS for what I need at work with our IPTV setup box and testing.

Thanks again Leon

Leon-Zetekoff wrote on 9/24/2023, 2:54 PM

i noticed on the render changes you have Mainconcept AVC. I have an Intel QSV graphics adapter in this box. I've played before setting the quality to 7 and it looked better. Should I user the software engine to render?

thanks leon

mark-y wrote on 9/24/2023, 4:00 PM

QSV render options are limited, I would stick with Mainconcept. You don't need the extra speed (or file size).

In VLC, pause the play back and press "E" repeatedly. The fake 60p (every other frame duplicated) with your two MKVs is easy to see.

Leon-Zetekoff wrote on 9/24/2023, 5:15 PM

hmmm ok i will give it a try. thanks so much will report back

Leon-Zetekoff wrote on 9/24/2023, 5:39 PM

Intel QSV looks about the same here - the main concept file size was 1MB larger :-)

 

mark-y wrote on 9/24/2023, 6:36 PM

The same render using QSV is garbled and unplayable here. But it looks like you are well on your way to making informed choices with DV in Vegas. Glad we got you started down the path to actual 59.94p, and good luck!

Leon-Zetekoff wrote on 9/25/2023, 4:51 PM

Hi Mark!

Thanks two more quick questions:

1. in regards to the quality number in the QSV engine, should I leave it at default (4) or increasing to 7 will that cause any artifacts?

2. when I digitize my Digital 8 tapes, any changes to make in the settigns you mentioned above?

Many thanks. Leon

mark-y wrote on 9/25/2023, 11:14 PM

1. I don't use QSV much except for "quick" UHD proofs, it's a personal preference. You will get a variety of opinions here.

2. Yes, your Digital8 is probably widescreen. The aspect ratios will be different for NTSC DV Widescreen vs. your 4:3 sample.

To get the Display Aspect Ratio (DAR) I showed you, I multiply the Storage Aspect Ratio (SAR) Width by the Pixel Aspect Ratio (PAR). That is the correct way, because everything is mathematically transformed to square pixels for delivery. Here is the math for your NTSC DV 4:3 in your sample.

  • 720(SAR) x .9091(PAR) = 654.552(DAR) = 654x480 (rounded to nearest even number)
  • It is not 640x480, which is the older NTSC analog square pixel format. That would give you a slightly skinny screen, and a slightly squished image if "Adjust Source Media" is left unchecked as I prefer.

Here is one resource, https://en.wikipedia.org/wiki/Pixel_aspect_ratio

QOD:

Can you tell me the optimal display dimensions for NTSC Widescreen DV 720x480 SAR at 1.2121 PAR?

Leon-Zetekoff wrote on 9/26/2023, 9:42 AM

Hi Mark....872x480. The D8 stuff is mainly 4x3 towards the end of using it I did a few recordings in 16x9 to see how it would look. Leon

 

mark-y wrote on 9/26/2023, 12:30 PM

You are close. NTSC Widescreen is 854 x 480 DAR.

Leon-Zetekoff wrote on 9/26/2023, 2:26 PM

how do you get 854? 720 x 1.2121 = 872???

mark-y wrote on 9/26/2023, 3:36 PM

Woops, my brain was stuck in NTSC Widescreen DVD (not DV) format, 720x480 SAR at 1.78:1 DAR, which also works for Analog NTSC, 704x480 at 1.2121 PAR, from a previous century. So many similar formats to keep track of -- shows my age, and welcome to the forum. Do use only even numbers, or you could end up with a line of dancing pixels along one edge.