TMPGEnc resize problem

[Vatrik]

Hi!

I have an 720p HD video, I open it in VirtualDub and do a resize to 720x405 letterbox. So the final output is 720x576 with black bars top and bottom. When I save it as avi it is good, and aspect of the image inside is 16:9. When I take that in TMPGEnc 4 Express to make it mpeg. After it renders, I got 720x576 video, but the picture inside is squeezed horizontaly a little bit - it`s not 16:9.
In TMPGEnc I put "Pixel 12:11 (Pal 4:3)"

Can you help me with this? Thanks in advance

[jagabo]

1280x720 should be resized to 704x432 and letterboxed and pillarboxed into a 720x576 frame if you want a 16:9 video in a 4:3 DAR frame. If you want a 16:9 DAR frame you should resize from 1280x720 to 704x576 and pillarbox in a 720x576 and encode as 16:9.

Your problem was that you didn't compensate for the fact that the pixels aren't square when you resized to 720x405 (1.778 SAR). If you adjust for the 12:11 PAR you'll see the height should have been:

405 * 12 / 11 = 442

[Vatrik]

What`s the difference between DAR, PAR and SAR frame?
Why should I do pillarbox, if I don`t want the black sides...
Can I somehow change the settings in TMPGEnc to get it right...

Thanks for the answer

[jagabo]

DAR = SAR * PAR

https://forum.videohelp.com/threads/316284-What-is-the-mathematical-formula-to-figure-o...=1#post1957501

https://forum.videohelp.com/threads/317206-Fairuse-wizard-Resolution-AR-question!?p=1964437&viewfull=1#post1964437

[Vatrik]

Ok, now, should I resize it to 704x432 in VirtualDub, and and frameserve it to TMPGEnc who will add letterbox.
Or should I put it in 720x576 directly in VirtualDub?

What exact setting should I do for HD to DVD conversion using VirtualDub and TMPGEnc Express?

[jagabo]

I would make a 16:9 DAR DVD. Resize from 1280x720 to 704x432, add borders to make a 704x480 or 720x576 frame in VirtualDub. Frameserve that to TMPGEnc and tell it the source is "16:9 625 line PAL" and encode as 16:9 DAR for DVD.

[Vatrik]

Is it possible not to have pillarbox in the final?
And what to do if want to do a center cut, not letterbox?

Thanks

[manono]

Is it possible not to have pillarbox in the final?

You're complaining about 8 columns of pixels on each side? They'll probably be lost in the TV's overscan and you most likely will never even see them. Wouldn't you rather do it right?

And what to do if want to do a center cut, not letterbox?

Are you talking about turning a 2.35:1 movie into a 1.78:1 movie by chopping off roughly a quarter of the picture from the sides? If so, you don't really want to do that. If you're talking about a 1.78:1 movie, then resize from 1280x720 to 704x576, add in the pillarbars to pad the width out to 720, and encode it as 16:9 - no letterbox.

[Vatrik]

OK, but I have a blackmagic decklink studio card, and when I downconvert it hasn`t thoese 8 pixels.
About center cut, I have a 16:9 video that i shot in hd. I want to do it on DVD, and cut the sides (they aren`t so important in this case), so that I have 4:3 picture.

[jagabo]

You can leave the video 704x576. That's a legal DVD size. If you don't care about the slight AR error just resize to 720x576 instead of 704x576 with pillarbox bars.

[manono]

About center cut, I have a 16:9 video that i shot in hd. I want to do it on DVD, and cut the sides (they aren`t so important in this case), so that I have 4:3 picture.

If it's originally 1280x720, crop 160 from each side to make it 960x720, resize to 704x480, add 8 columns of pixels to both sides to pad it out to 720x480 (or leave it at 704x480) and encode it as 4:3.

[Vatrik]

Hi!

I maybe found a solution to crop those 8 pixels. Instead of cropping the video 160 by each side I cropped it by 152 and set the new size to 720x576. That`s for center crop.

And for letterbox, I crop each side by 8 pixels, set the new size to 720x432, and put that in 720x 576.
TMPGEnc recognize it as PAL 12:11

Do you think this is mathematically correct?

[Vatrik]

Please somebody?

[jagabo]

I maybe found a solution to crop those 8 pixels. Instead of cropping the video 160 by each side I cropped it by 152 and set the new size to 720x576. That`s for center crop.

That's not quite right. Eight pixels in the 704x576 image are bigger than 8 pixels in the original 1280x720 image:

8 * 1280 / 704 = 14.55

So you you should leave ~14 more pixels on each side, not 8. So remove 146 pixels from the left and right then downsize to 720x480.

And for letterbox, I crop each side by 8 pixels, set the new size to 720x432, and put that in 720x 576.

Just resize to 720x442 and letterbox to 720x576.

Or just use 704x576 as your frame size. When a DVD player plays a 720x576 frame it's supposed to cut off 8 pixels from the left and right sides and display the inner 704x576. So those extra pixels shouldn't be visible anyway. (In practice they often are though.)

[Vatrik]

I am not worrying about DVD player or TV, but if someone is watching on the computer, then the player doesn`t cut them off

[El Heggunte]

I am not worrying about DVD player or TV, but if someone is watching on the computer, then the player doesn`t cut them off

Then you DON'T need to set the video width to 704 or 720, nor the video height to 480 or 576, nor the Display Aspect Ratio to 4:3 or 16:9.

[Vatrik]

About center cut, I have a 16:9 video that i shot in hd. I want to do it on DVD, and cut the sides (they aren`t so important in this case), so that I have 4:3 picture.

If it's originally 1280x720, crop 160 from each side to make it 960x720, resize to 704x480, add 8 columns of pixels to both sides to pad it out to 720x480 (or leave it at 704x480) and encode it as 4:3.

What if I want 720x576 (not 720x480). I crop the sides by 160, and resize to 704x576, but I think it`s slightly squeezed horizontaly. I tried 720x576, and I think it`s not squeezed. How to know what is right?

[jagabo]

About center cut, I have a 16:9 video that i shot in hd. I want to do it on DVD, and cut the sides (they aren`t so important in this case), so that I have 4:3 picture.

If it's originally 1280x720, crop 160 from each side to make it 960x720, resize to 704x480, add 8 columns of pixels to both sides to pad it out to 720x480 (or leave it at 704x480) and encode it as 4:3.

What if I want 720x576 (not 720x480). I crop the sides by 160, and resize to 704x576, but I think it`s slightly squeezed horizontaly. I tried 720x576, and I think it`s not squeezed. How to know what is right?

You set the PAR to 4:3 PAL (12:11), or the DAR to 4:3. And use a player that supports PAR/DAR flags.