0001335: Jittery video from CamStudio screen caps

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Date Submitted

Last Update

0001335

Kdenlive

Rendering

public

2009-12-09 18:51

2010-02-20 08:17

Reporter

pfong

Assigned To

ddennedy

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

fixed

Platform

32 bit intel and alike

Ubuntu Linux

OS Version

9.04

Product Version

0.7.6

Target Version

Fixed in Version

0.7.7

Summary

0001335: Jittery video from CamStudio screen caps

Description

have screen caps produced by CamStudio that become jittery regardless of the output render format I choose. It seems there may be unnecessary de-interlacing going on. Some frames are perfectly clear while alternating frames are shifted slightly and blurry.

My test project is a VGA NTSC project (640x480 progressive). My test clip is a 640x480 encoded with the CamStudio lossless codec. This plays fine in mplayer without any jittering. I've tried various render profiles but I'm currently testing with FFV1 lossless. When I play the output in mplayer or VLC the video jitters. Setting scanning to force progressive does not seem to make a difference.

I'm not sure if this is a rendering or input problem. It's hard to tell but it appears that the jittering may be present when I play in the clip monitor.

I've also tried converting the input clip to FFV1 using mencoder before loading into kdenlive. This does not appear to make a difference.

Steps To Reproduce

Place attached test file on timeline in a new VGA NTSC project. Render to FFV1. View in VLC. Notice the text on the Firefox tab jitters.

Tags

render

Build/Install Method

Distribution package

Attached Files

kdlwebsite.avi [^] (1,711,104 bytes) 2009-12-09 18:51

registration1.ogv [^] (5,488,408 bytes) 2010-01-08 07:32

Relationships

Notes
(0004499) deven (reporter) 2010-01-08 07:38	Reporting same problem, adding registration1.ogv as another example source. Details: 1. captured by recordmydesktop 2. profile used was size 1024x700, fps 15, pixel 1x1, aspect 1024x700 3. output was just the input file rendered with no effects 4. Possibly related issue: in this clip a few seconds are ignored, i.e the output rendered as well as clip/project monitor do not display the first few secs of the source.

(0004509) ddennedy (developer) 2010-01-11 03:39	Fix in MLT commit ce66386. Indeed, the problem was that not all frames were properly indicating their interlaced status resulting in unneeded deinterlacing. If you are running a SVN version of Kdenlive, a while ago I had added a Force Progressive option in the Advanced section of the clip properties dialog that will let you workaround the problem.

Issue History
Date Modified	Username	Field	Change
2009-12-09 18:51	pfong	New Issue
2009-12-09 18:51	pfong	File Added: kdlwebsite.avi
2009-12-22 06:00	ddennedy	Status	new => assigned
2009-12-22 06:00	ddennedy	Assigned To	=> ddennedy
2010-01-08 07:25	deven	Tag Attached: render
2010-01-08 07:32	deven	File Added: registration1.ogv
2010-01-08 07:38	deven	Note Added: 0004499
2010-01-11 03:39	ddennedy	Note Added: 0004509
2010-01-11 03:39	ddennedy	Status	assigned => resolved
2010-01-11 03:39	ddennedy	Fixed in Version	=> future version
2010-01-11 03:39	ddennedy	Resolution	open => fixed
2010-02-02 10:34	j-b-m	Fixed in Version	future version => 0.7.7
2010-02-20 08:17	j-b-m	Status	resolved => closed