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You'll find that some devices ignore Sampling Aspect Ratio flags and will play such videos at the Frame Aspect Ratio or sometimes just stretch the video to full screen.
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Ok - 960x720 (4:3) with empty space displayed at the sides or 1280x720 (16:9 pillarbox with purposely added bars at sides) - both of which result in square pixels. - Correct?
Would the 720 vertical best be achieved by capturing 480 and resizing or capturing 720 from the beginning?
... and yes - Video8 for me at the present... -
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What makes you think it's hardware? It's more likely just software. In any case, there's nothing magic about hardware. It's inferior to software on almost all counts except one: speed. Hardware (while capturing) has to work in real time. It's designed to perform some simple matrix algorithms quickly. Not for general computing.
Cleanup, QTGMC, nnedi3 will get you better results than any hardware or capture driver/software.Last edited by jagabo; 27th May 2020 at 23:46.
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Resizing is always a compromise, The resizing will always be fractional not integer so some lines get crashed, some get doubled, Why don't you leave that to the display that was designed to handle this kind of work.
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Yes
Would the 720 vertical best be achieved by capturing 480 and resizing or capturing 720 from the beginning?
Upscaling was suggested for the YT case . Currently, that's the only way you get full temporal resolution (59.94p), otherwise you discard 1/2 the motion samples (29.97p) . The cutoff is 720 height. It's been like that for a few years for YT, I don't think it's going to change -
Last edited by GrouseHiker; 28th May 2020 at 18:12. Reason: clarified non-YouTube
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Back to the original subject of this post... I did more research and this is the result. If I understand this correctly, it turns out the "color under" system of recording on tape significantly reduces the color resolution. For Video8, Hi8, and VHS, sampling at 720 resolution with 4:2:2 pixels produces a huge (372%) oversampling rate. For sampling an NTSC-conforming signal, the oversampling is only 6%.
These are simply numbers and calculations based on Nyquist-Shannon. From what I have read the Nyquist-Shannon minimum sampling rate of 2x peak frequency is too low, and oversampling is required.
The numbers are interesting, but I am NOT making any recommendations here!
[Attachment 53589 - Click to enlarge] -
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I uploaded your 704 x 480 CD video for them to try. I'll report back when I get some results.
It displays round for me on a Windows 10 PC - no clue as to what app is actually playing it.
It displays as an oval in MPC-HC until I set Aspect Ratio to 4:3 - then it's a circle. -
If you want the best chance of video playing at the right aspect ratio you have two choices.
1) Create a DVD or Blu-ray movie disc. Those formats are very strict and support limited configurations. If you follow the specs you'll get the right aspect ratio as long as the player isn't overridden.
2) Don't make a DVD or BD and resize yourself to a square pixel aspect ratio and encode 1:1 sampling aspect ratio. -
MPC-HC plays perfect circle in both the default and the 4:3 setting, on two machines Win7 and Win10. You have something screwed up in your computer, Try resetting the player.
I've also tried a Samsung tablet latest Android, Samsung galaxy phone, iPhone 6, iPhone 7 and LG 65" OLED TV (USB flash) and every machine played the sample in a perfect circle, I did also tried a PAL VHS sample, a S-VHS NTSC sample, Betacam SP NTSC sample and Hi8 NTSC sample all cropped to 704 active video area and all played a perfect 4:3 ratio.
I have 3 devices left to try, A media player from 2012, a Blu-ray player in file mode and my Son's PS4 if those pass I will give this method a 99% compatibility. -
There are posts in these forums all the time about non-square pixel videos displaying with the wrong aspect ratio on different devices. The media players built into TVs seem to be the worst offenders.
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That is because either the PAR is not set correctly or the video has a non standardized resolution, also some devices are designed to display 720x480 as 16/9 by default. I see those posts all the time.
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I don't know what devices are playing them on but I tried devices that are used by 99% of the people worldwide, hence 99% compatibility.
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