0001972: can't adjust pixel aspect ratio (PAR) for PNG title images

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Project

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Date Submitted

Last Update

0001972

Kdenlive

Rendering

public

2011-01-07 16:00

2011-01-15 10:36

Reporter

lemzwerg

Assigned To

j-b-m

Priority

normal

Severity

minor

Reproducibility

always

Status

assigned

Resolution

open

Platform

OS Version

Product Version

Recent git

Target Version

Fixed in Version

Summary

0001972: can't adjust pixel aspect ratio (PAR) for PNG title images

Description

My DV video has 720x576 pixels; kdenlive applies a PAR of 1.066667 to compensate the non-rectangular pixels of a normal television screen, which gives 768x576 pixels on my laptop screen. To avoid distortions, I want to compute title images at 720x576 also – the font rasterizer produces better results if it renders for different X and Y resolutions instead of squeezing the horizontal axis later on.

However, kdenlive apparently doesn't like this approach; it seems that I can't specify a PAR for PNG images.

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No tags attached.

Build/Install Method

Manual build from SVN

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Notes
(0006304) j-b-m (administrator) 2011-01-07 23:19	If I am correct, the best way to make it work in Kdenlive / MLT is to make your title images using a 768x576 resolution. However I agree that being able to modify the aspect ratio of a picture can be useful, I sent a patch on MLT's mailing list to fix that.

(0006307) lemzwerg (reporter) 2011-01-08 10:55	Thanks. 768x576 works fine, but it isn't exactly what I want. As soon as your patch is in git, I'll test it.

(0006321) lemzwerg (reporter) 2011-01-15 10:36	Using kdenlive commit b4b82a1b and mlt commit c2e97113, I can now set the aspect ratio for PNG images. However, it still doesn't work as expected, unfortunately: If I render a project, 720x576 titles scaled with an aspect ratio 4:3 are shifted to the left in the output video. Note that I'm not happy that I have to set the aspect ratio at all. From a conceptual point of view, it's the wrong action, I believe. I would really like to change the PAR, similar to ordinary DVs.

Issue History
Date Modified	Username	Field	Change
2011-01-07 16:00	lemzwerg	New Issue
2011-01-07 23:19	j-b-m	Note Added: 0006304
2011-01-07 23:19	j-b-m	Assigned To	=> j-b-m
2011-01-07 23:19	j-b-m	Status	new => feedback
2011-01-08 10:55	lemzwerg	Note Added: 0006307
2011-01-08 10:55	lemzwerg	Status	feedback => assigned
2011-01-15 10:36	lemzwerg	Note Added: 0006321