Quantcast NTSC 4:3 aspect ratio: 720x540?? - Page 2 - digitalFAQ Forum
  #21  
07-31-2021, 10:49 PM
kingbean kingbean is offline
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Quote:
Originally Posted by traal View Post
So, I prefer to archive the original .avi files verbatim as they came from the capture card (or rather VirtualDub) ...

Instead, I set the DAR in MkvToolNix when I'm combining the separately restored audio and video streams and creating chapters.
My goal here is to archive the AVIs un-restored, for now. I'm working through a collection of 1800+ tapes, each averaging between 4-7 separate concerts per tape.. so, the thought of even attempting restoration as part of my process makes me weak at the knees.

Re-packing into MKV with a DAR is to allow them to play back at the correct ratio, with no other changes. Then, down the track, restoration is still possible, when time/desire permits.

Are there any risks with remuxing AVI > MKV? Would I be better off just leaving them along and manually adjusting aspect during playback?

In the meantime, a deinterlaced H264 file goes onto YouTube and is then deleted from my system.
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  #22  
08-01-2021, 12:06 AM
traal traal is offline
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Quote:
Originally Posted by kingbean View Post
Are there any risks with remuxing AVI > MKV?
The risk is very low, I admit.

Oh, I would add
Code:
-tune grain
to your ffmpeg line so it doesn't replace VHS "grain" with macroblocking.
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  #23  
08-01-2021, 12:52 AM
latreche34 latreche34 is offline
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Quote:
Originally Posted by lordsmurf View Post
That's not accurate.

Some cards do have 640x480 hardware limitation, but it's mostly ancient late 90s capture hardware, or cheap Chinese 2000s cards (USB, PCI, other). I know of several USB1 cards that did 640x480, but I forget the names now, that was literally decades ago.

So while not accurate, nothing you'd see today. None of that stuff will run on modern Win7/8/10, and in fact many quite working due to Windows XP, being 95/98/98SE/ME hardware only.

In 2021, this is trivia, a footnote.
While they do have an output limitation I can guarantee you the ADC chip inside samples at 704+16, The chip design was stndardized according to SMPTE 601 back then and capture card manufacturers don't have the option to choose whatever sampling resolution they want, they can choose the ouput resolution though via software or hardware resizing.
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  #24  
08-01-2021, 12:59 AM
latreche34 latreche34 is offline
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Quote:
Originally Posted by kingbean View Post
Sorry I think I may have confused you with my rambling questions.

For playback I do not want ANY encoding whatsoever. Just a simple DAR change. traal's post above has put my mind at ease on this matter.

The only encoding I want to do is from the raw capture file to a YouTube friendly mkv/mp4. I tried the ffmpeg scripts you provided, but it didn't seem to be what I'm after. My interlaced, 720x480 NTSC AVI became an interlaced, 720x480/720x528 1.36 ratio MP4.

You'd mentioned earlier about giving YouTube a 1440x1080 file? Can you break it down step by step?

HuffYUV AVI > AviSynth script > ffmpeg script > YouTube friendly file
The scripts I provided have SAR for resolutions 704x480 and 704x576, they don't work on 720 files, And those are not for youtube, they are for playback on TV's and smart devices.

For youtube I only de-interlace and do frame edge work and upload the lossless files (kind of, the lossy part is de-interlacing but still near lossless), no encoding, Here are some videos.
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  #25  
08-01-2021, 02:43 AM
kingbean kingbean is offline
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Yeah, now we're talking! They look great. Could you post the script you use for those?

edit: does YouTube work better with the lossless files, or is that just your preference? My Australian internet connection would much prefer to upload H264 files, but your uploads really do look nice. I might have to do some comparisons.

Quote:
Originally Posted by traal View Post
Oh, I would add
Code:
-tune grain
to your ffmpeg line so it doesn't replace VHS "grain" with macroblocking.
Thanks, I had no idea about that!
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  #26  
08-01-2021, 03:22 AM
latreche34 latreche34 is offline
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As I said I use AvsPmod a script editor and load the file to it, Then I do the crop visually and resize, the resulting file is uploaded to youtube:

Code:
AVISource("C:\Users\Path\File.avi")
QTGMC(Preset="Fast")
prefetch(4)
Crop(#, #, -#, -#)
LanczosResize(1440, 1080)
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  #27  
08-01-2021, 05:18 AM
kingbean kingbean is offline
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I downloaded AvsPmod earlier today, it looks good. Haven't had a chance to play with it yet, but I'll do so during the week and try out your script. Thanks heaps for your help!
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  #28  
08-01-2021, 12:56 PM
latreche34 latreche34 is offline
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You would need to manually add crop and resize for each video and they are both at the AvsPmod menu, Because each video has unique edges and cannot be applied to all videos, It also uses vdub2 as a dependency, once you satisfied with your results hit the arrow button and it loads the video into vdub2 and from there save as HuffYUV and upload that to youtube.

Tip: Since you are resizing you can crop all the way around to the bare active video area, just make sure your ratio is not far away from 704:480 for NTSC and 704:576 for PAL, up to 4 pixels miss match is okay.

In other words, If for example you crop down V to 474, your H should be around 696 +/- 4 pixels, The same analogy for PAL.
Important: never do this on an interlaced video, only de-interlaced, that's why the QTGMC script is put in the first line.
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  #29  
08-02-2021, 01:41 AM
kingbean kingbean is offline
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Great, thanks again. I've got AvsPmod up and running and it's great so far. I'd been put off getting into too much AviSynth stuff because it was daunting (still is). But having the video preview is a big help.

Is there any reason to use LanczosResize rather than Spline36Resize (or others)? I hadn't come across Lanczos previously, and have used Spline36 for the (limited) resizing I've done so far.
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  #30  
08-02-2021, 02:29 AM
latreche34 latreche34 is offline
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I think it is the best (least damaging) so far just like QTGMC for de-interlacing.
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  #31  
08-02-2021, 02:40 AM
kingbean kingbean is offline
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Thanks. I'll have a play around with all the info I've taken from this thread and hopefully be able to get some good results!
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  #32  
08-04-2021, 09:38 PM
nicholasserra nicholasserra is offline
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Always love SAR/DAR threads. Take whatever you thought you knew, and question it all over again lol
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