0002015: Crop Effect - Cropping parameters don't seem to work correctly

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Date Submitted

Last Update

0002015

Kdenlive

Effects

public

2011-02-13 18:24

2011-11-01 18:56

Reporter

yellow

Assigned To

ddennedy

Priority

normal

Severity

minor

Reproducibility

have not tried

Status

closed

Resolution

won't fix

Platform

64bit Maverick Meerkat

Sunabs svn PPA

OS Version

Product Version

Recent git

Target Version

Fixed in Version

0.8.2

Summary

0002015: Crop Effect - Cropping parameters don't seem to work correctly

Description

I'm trying to create a typical 2:35:1 frame 806 high out of 1080P frame by simply setting a top crop of 131 & a bottom crop of 132 but just adding the first crop to the top immediately gives me a 60 pixel crop top and bottom and scales the image up. This is without the Auto Centre Crop Ticked.

I can the frame is scaled up because if I extract the cropped frame and overlay it in Gimp on the same frame extracted without the crop active, set the opacity to 50% I see strong ghosting clearly showing the cropped frame has been scaled up.

Additional Information

I've got to say I think that any auto scaling by default on any of the effects is totally wrong and hope this is a bug not a default. Although I see similar auto scaling with Pan & Zoom which also doesn't appear to work correctly, I've reported that on a separate bug report.

Any auto scaling operation for any filter/effect/import really should be off by default and implicitly 'switched on' or applied if required by the user

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Build/Install Method

3rd party package

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Notes
(0006534) ttill (developer) 2011-03-04 23:18	Unable to reproduce. Cropping from top centers the frame but nothing is removed from the bottom.

(0006543) sunab (reporter) 2011-03-05 15:51	Using the same packages as yellow. Using 1080p footage. Cropping 131 pixels on top -> 131 pixels removed from top (nothing is removed from bottom), the frame it automatically centered resulting in equal top/bottom 65 pixels black borders. This behavior is only expected if "Auto center crop" is ticked, but it's not. For me that is the issue. But i don't see any kind of scaling. By the way it seems I found another bug using crop and proxy files (I will open a new bug report).

(0006567) ddennedy (developer) 2011-03-12 01:15	This is by design. It is edge cropping. After taking N from the top, the aspect ratio no longer is the same, so it is padded to fill the frame by centering the image. It is not cropping N/2 from opposing edges; it only takes it from the edge you request. Overall it works like this: crop edges as requested from the source image, deinterlace if needed, scale to project resolution while keeping aspect ratio, center and pad with black. Then, all other effects are applied. I am sorry if you do not like it, but that is the design of MLT, take it or leave it.

Issue History
Date Modified	Username	Field	Change
2011-02-13 18:24	yellow	New Issue
2011-03-04 23:18	ttill	Note Added: 0006534
2011-03-04 23:18	ttill	Status	new => feedback
2011-03-05 15:51	sunab	Note Added: 0006543
2011-03-12 01:15	ddennedy	Note Added: 0006567
2011-03-12 01:15	ddennedy	Status	feedback => resolved
2011-03-12 01:15	ddennedy	Resolution	open => won't fix
2011-03-12 01:15	ddennedy	Assigned To	=> ddennedy
2011-07-05 12:15	j-b-m	Fixed in Version	=> 0.8.2
2011-11-01 18:56	j-b-m	Status	resolved => closed