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IDProjectCategoryView StatusDate SubmittedLast Update
0002428KdenliveRenderingpublic2011-12-01 02:002011-12-02 17:49
Reporterharriswong 
Assigned Toj-b-m 
PrioritynormalSeveritymajorReproducibilityalways
StatusassignedResolutionopen 
Platform64 bitOSKubuntuOS Version10.04
Product VersionRecent git 
Target VersionFixed in Version 
Summary0002428: Vignette and compositing effects flicker when rendered
DescriptionVideo rendered through Kdenlive (by way of kdenlive_render) containing a vignette or composite-based effect flickers erratically (with white flashes) in the "effected" portion of the screen.
Flickering can be defeated with two cumbersome workarounds:
*Enabling time / frame count burn-in from render dialogue before render
*Exporting a script and rendering using a "melt" command line thereby
sidestepping kdenlive's "kdenlive_render" facilities altogether.
*Rendering a 29.97fps timeline (using appropriately converted media) instead of native 23.98 video (this was tried once and appeared to work).
Steps To ReproduceRender 23.98fps video with vignette or composite effect via kdenlive directly
Additional InformationI'm using:
FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --extra-version=4:0.5.1-1ubuntu1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  libavutil 49.15. 0 / 49.15. 0
  libavcodec 52.20. 1 / 52.20. 1
  libavformat 52.31. 0 / 52.31. 0
  libavdevice 52. 1. 0 / 52. 1. 0
  libavfilter 0. 4. 0 / 0. 4. 0
  libswscale 0. 7. 1 / 0. 7. 1
  libpostproc 51. 2. 0 / 51. 2. 0
  built on Mar 4 2010 12:41:55, gcc: 4.4.3

Source media acquired via a Panasonic DMC-GH2 @ 24p.

Attached is a render log and a brief sample of video from a corrupt render.

3 flashes can be seen in the video provided.

I CAN PROVIDE MORE DETAILS IF NEEDED. PLEASE LET ME KNOW.

Many thanks for your help here. :)
TagsNo tags attached.
Build/Install Method3rd party package
Attached Files? file icon FlickerBugReport.mp4 [^] (2,579,059 bytes) 2011-12-01 02:00
txt file icon kdenlive_render.log.XMTJ6764.txt [^] (30,732 bytes) 2011-12-01 02:02 [Show Content]
txt file icon script006.sh.txt [^] (569 bytes) 2011-12-01 16:31 [Show Content]
txt file icon script006.sh.mlt.txt [^] (11,951 bytes) 2011-12-01 16:31 [Show Content]

- Relationships

-  Notes
(0007641)
j-b-m (administrator)
2011-12-01 09:09

Hi. Could you attach the script created when doing 'render to script' using the same project? Direct rendering and script rendering both call melt, so there must be a difference in the parameters....
(0007645)
harriswong (reporter)
2011-12-01 16:45

There's no difference in the command line that I'm aware of and I derived the melt command I used for manual rendering directly from the log I attached to this report. I noticed something in the kdenlive_render code about disabling VDPAU prior to the render. Is there something I can look into there?
(0007646)
j-b-m (administrator)
2011-12-02 17:49

One problem could be the "real_time" parameter. This allows to use several threads to do the rendering but it is an experimental feature, not recommanded to use.

You can reset the value in Kdenlive Settings dialog > Environment > Processing threads

The value should be set to 1, seems to be 3 in your case. Please try to render with the default 1 value and let me know.

- Issue History
Date Modified Username Field Change
2011-12-01 02:00 harriswong New Issue
2011-12-01 02:00 harriswong File Added: FlickerBugReport.mp4
2011-12-01 02:02 harriswong File Added: kdenlive_render.log.XMTJ6764.txt
2011-12-01 09:09 j-b-m Note Added: 0007641
2011-12-01 09:09 j-b-m Assigned To => j-b-m
2011-12-01 09:09 j-b-m Status new => feedback
2011-12-01 16:31 harriswong File Added: script006.sh.txt
2011-12-01 16:31 harriswong File Added: script006.sh.mlt.txt
2011-12-01 16:45 harriswong Note Added: 0007645
2011-12-01 16:45 harriswong Status feedback => assigned
2011-12-02 17:49 j-b-m Note Added: 0007646


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