Avisynth Aspect Ratio Resize Help

[t4com4]

Hello,


I have a progressive source of ..

Width : 1920
Height : 1080
Pixel aspect ratio : 1.000
Display aspect ratio : 1.778
Display aspect ratio : 16:9
Frame rate : 29.970
Standard : NTSC


in which i want to convert to dvd keeping aspect ratio close as possible to original.
i plan to use cce and my script is ..

LoadPlugin("DGAVCDecode.dll")
AVCSource("00000.track_4113.dga")
Lanczos4Resize(768,432,0,0,1920,1080)
AddBorders(0,24,0,24)
ConvertToYUY2()


can someone please help me, i don't think i'm doing this correct..

[Alex_ander]

In DVD AR is completely defined by mpeg AR flags (it's either 4:3 or 16:9), not by pixel numbers - so if you don't have to crop, just resize all available pixels to 720x480 (no borders) and encode with 16:9 setting in CCE.
...............
Lanczos4Resize(720,480)
#ColorMatrix(mode="Rec.709->Rec.601")# if you load that plugin
ConvertToYUY2()

[t4com4]

so then does this look right?


LoadPlugin("DGAVCDecode.dll")
LoadPlugin("ColorMatrix.dll")
AVCSource("00000.track_4113.dga")
Lanczos4Resize(720,480)
ColorMatrix(mode="Rec.709->Rec.601")
ConvertToYUY2()

[dphirschler]

What does the colormatrix function do?


Darryl

[jagabo]

ColorMatrix(mode="Rec.709->Rec.601") changes from HD rec.709 color to SD rec.601 color. DVD supports rec.709 though, you just have to flag it when you encode as MPEG 2. I don't know if CCE supports it. HcEnc does.

[manono]

DVD supports rec.709 though, you just have to flag it when you encode as MPEG 2. I don't know if CCE supports it. HcEnc does.

And you then have to hope that your player honors the Rec.709 setting. To be safe I wouldn't even consider creating a Rec.709 DVD. And CCE doesn't support it. I suspect that HCEnc only does because it allows for Hi-Def MPEG-2 encoding, which CCE doesn't. Do you have any link to support a claim that Rec.709 is legal for DVD Video?

[t4com4]

Hello,

what if my source is..

Width : 1920
Height : 1080
Display aspect ratio : 1.85
Standard : NTSC


in which i want to convert to dvd keeping aspect ratio close as possible to original.
i plan to use cce and my script is ..

LoadPlugin("DGAVCDecode.dll")
AVCSource("00001.dga")
Lanczos4Resize(???,???)
AddBorders(?,?,?,?)
ConvertToYUY2()


can someone please help me fill in the blanks with the correct numbers?

[jagabo]

LoadPlugin("DGAVCDecode.dll")
AVCSource("00001.dga")
Lanczos4Resize(720,480)
ConvertToYUY2()

Encode as anamorphic 16:9 DVD.

[t4com4]

wouldn't the aspect be off then? would this give me correct aspect of 1.85?

Lanczos4Resize(720,460)
AddBorders(0,10,0,10)

[jagabo]

DVD uses a DAR flag which tells the player the final display aspect ratio, 4:3 or 16:9. You can also use:

LanczosResize(704,480)
AddBorders(8,0,8,0)

Buried deep down within the MPEG 2 data is a flag that tells the player whether the full 720x480 frame or the inner 704x480 sub frame contains the 16:9 DAR image. I don't know of any tool that lets you see or set that flag. I suppose you could avoid the issue alltogether by using a 704x480 frame.