Aspect Ratio

[mremulator]

I have a .ts file of Back to the Future with a resolution of 1920x1080, however, under "display size" in "video program information" the resolution is 1440x1080. When you play the file back on anything other than my XBOX 360 or in Windows Media Player 10 the aspect ratio is wrong. The aspect ratio is already 16.9 and the resolution is 1920x1080, it's just most players (VLC for example) use the secondary 1440x1080 resolution embedded in the file.

How can I fix this?

 

[phd]

Have you tried setting the header aspect ratio when you save the file? Click the Options button in the file save dialog box and select the aspect ratio you desire.

 

[Lester Burnham]

I have a .ts file of Back to the Future with a resolution of 1920x1080, however, under "display size" in "video program information" the resolution is 1440x1080. When you play the file back on anything other than my XBOX 360 or in Windows Media Player 10 the aspect ratio is wrong. The aspect ratio is already 16.9 and the resolution is 1920x1080, it's just most players (VLC for example) use the secondary 1440x1080 resolution embedded in the file.

How can I fix this?

Is it anamorphic?

 

[mremulator]

PHD: Yes I tried that, it's already 16.9 and re-muxing at 16.9 changes nothing.

Lester: On my PDP436-XDE via XBOX360 it's a perfect 1.85.1, same in the VRD preview window and Windows Media Player 10. Play the file in VLC or on my Pixel Magic MB100 and it picks up the 1440x1080 resolution (1.33) aspect ratio?

I believe it is anamorphic.

 

[Danr]

One possibility is that there is a sequence extension which can affect the display dimensions. You may want to upload a small clip of the file to our ftp site and we can take a look. Send an email to support@videoredo.com after you've uploaded.

For upload instructions see the "sticky" post at the top of this message thread.

 

[mremulator]

Done, uploaded.

 

[phd]

Load your file into VLC and set zoom at 1/2.

It switches to widescreen. You can then zoom to regular and it maintains the correct aspect ratio.

 

[mremulator]

Thanks, I figured that out. I'm more interested in what's embedded in the file and how it can have 2 different resolutions?

 

[Danr]

There's a sequence header in the file that tells the decoder to display at 1440x1080 (i.e. 4:3). That's why some players show the video as 4:3.

 

[mremulator]

There's a sequence header in the file that tells the decoder to display at 1440x1080 (i.e. 4:3). That's why some players show the video as 4:3.

Can the sequence header be removed/changed?

 

[Danr]

More correctly, there's a sequence header extension record in each GOP that has the display change. So, the quick answer is Yes it can be removed. However VideoReDo does not currently have that capability.

 

[mremulator]

More correctly, there's a sequence header extension record in each GOP that has the display change. So, the quick answer is Yes it can be removed. However VideoReDo does not currently have that capability.

One for the future perhaps?

 

[Danr]

Sure, if there's demand for it. As far as I can remember, this is the first request.

 

[Robbi]

16x9 > 4x3 > 16:9 or 4x3 > 16x9 > 4x3

Dan I know you have tried to overcome this, by providing a drop list to choose aspect ratios.

It is hard to tell when the recording starts of in one aspect ratio on say adverts. Then changes to another aspect for the program or film. It still gets me now, and harder to tell because broadcasters stretch the programs more.

With a channel having a channel logo it does move about horizontally in/out of adverts giving the game away. But the channels that have no logo or adverts is still near impossible to tell. Until you realise once it is on dvd. Not that i want them to have channel marker logos either, best without for viewing.

I didn't realise this idea was shelved. I thought it was on a slow back burner, until you figured it out. Not the first request, it was requested on the group board long ago now.

Maybe it will happen someday, it is still a useful needed feature to have. For videoredo to change the aspect ratio automaticaly.

 

[Danr]

Robbi,

This thread isn't the same thing as dimensions changing dynamically. That project is most definately on the list. This thread is about a file that has a sequence header extension that alters the display dimensions. What you are referring to is encoding dimensions.

 

[morato]

I was just wondering if you were still considering adding support for changing/removing sequence display extensions.

I've got a bunch of .ts files I would love to remove the display extension on so I can watch in the proper aspect ratio (unfortunately my player respects the display extension and not the aspect ratio flag).

Thank you!