from 16:9 hd (1:1) to 14:9 pal

[smok3]

ok, so i did a 1280x720, ar1:1, 16:9 edit, and now i would like to make 14:9 SD pal delivery version using avisynth, my try:

avisource("file.avi")

# Crop(clip clip, int left, int top, int width, int height, bool align)

crop(80,0,1120,720)

# RESIZING
LanczosResize(720,494)

# BORDERS
AddBorders(0,41,0,41)

does this look correct to you?

tnx

[SeeMoreDigital]

There is another alternative....

Rather than reducing the PAL std def vertical resolution. Have you considered encoding at 720x576 pixels and adding 56:45 aspect ratio signalling?

Like this sample (http://82.10.220.174/Uploaded_Files/Doom9_Forum_files/720x576_MPEG-4_14.9_with_56.45_ARS.mp4.7z)!


EDIT: I take it, you are encoding to MPEG-4

[Mug Funky]

i would like to make 14:9 SD pal delivery version using avisynth

that says to me it should be 14:9 letterboxed on 4:3 by design. loads of shows are broadcast that way on analog channels (which i still use - i've got a digital tuner in my computer but it doesn't work and in the end the house's TV has an analog tuner).

@ smok3: you might want to keep the ratio, but trim it such that it is aligned to 8x8 or (better still) 16x16 borders. this'll make it encode better if it ever does go digital.

[scharfis_brain]

another hint: for analog delivery one should use correct apsect ratio according to ITU recommendations:


so this is either:
704x496
or
720x506

I'd recommend 704x496 with analog blanking to 720 (8px wide borders each side)

[smok3]

Mug Funky; the backup will stay HD, so i can do anamorfic (or whatever) version later...

scharfis_brain, so the 14:9 area should be 720x506? (i would prefer this fullwidth version.)

[scharfis_brain]

704 is full width!
720 is wider than full width (image parts gets chopped off during playback)

[smok3]

ok, what exact itu (or ebu) document should i look at? (some bbc docs say that full width is 702, but that calculus should be used with 704.., oh well...)

[SeeMoreDigital]

720 is wider than full width (image parts gets chopped off during playback)That depends on what you're playing it back with and your viewing equipment.

MPEG-4/DVD players connected via an analogue output to TV, will "chop-off" parts of the over-all image due to over-scan.... But this does not happen when connecting via an digital output. Or when using a software player/PC display.