[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[emohr]

https://bugs.kde.org/show_bug.cgi?id=361976

emohr  changed:

   What|Removed |Added

 Status|REPORTED|RESOLVED
 Resolution|--- |FIXED

--- Comment #17 from emohr  ---
It seems that this report is related to very old unmaintained version. A lot
changed since then, especially the timeline got a complete rewrite and it is
likely that this has been fixed.

Feel free to reopen this bug or create a new report if this is still happening
with the latest version (https://kdenlive.org/en/download/)

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=361976

fritzib...@gmx.net changed:

   What|Removed |Added

  Flags||timeline_corruption+
 CC||fritzib...@gmx.net

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Jesse]

https://bugs.kde.org/show_bug.cgi?id=361976

--- Comment #16 from Jesse  ---
@Wegwerf, I'm unsure how to export directly using ffmpeg in the terminal,
sorry. If you can provide the steps, I'll be happy to test and report.

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Jesse]

https://bugs.kde.org/show_bug.cgi?id=361976

Jesse  changed:

   What|Removed |Added

   Platform|Mint (Ubuntu based) |Ubuntu Packages
Version|unspecified |git-master

--- Comment #15 from Jesse  ---
Thanks for the feedback, all. Here's a link to download a sample file made in
Blender:
https://www.dropbox.com/s/w342e2se92u63ot/blender%20sample%20file%20h264%206000mb-s%20bitrate.mp4?dl=0.

Adding an effect and preview-rendering the file above in Kdenlive will produce
the artifacts I'm mentioning. This is confirmed in the latest git master build
16.11.70.

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Wegwerf via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361976

--- Comment #14 from Wegwerf  ---
BTW, Jesse can you tray to transcode your source clip directly using ffmpeg,
using the parameters that you see in Kdenlive's render profile? This would help
in detecting any issues with MLT, albeit I don't think this is a MLT issue.

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Wegwerf via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361976

--- Comment #13 from Wegwerf  ---
Yes, please do, as your original DB link does not work anymore.

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Jesse via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361976

--- Comment #12 from Jesse  ---
@Wegwerf, thanks for the update request. This is still happening in the latest
git master build. Would it help if I provided a sample video clip for testing?

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Wegwerf via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361976

--- Comment #11 from Wegwerf  ---
Jesse, any news on this stale report?

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Wegwerf via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361976

--- Comment #10 from Wegwerf  ---
Jesse, another thought just occurred to me: when you check the project monitor
in 1:1 and without preview rendering, is the monitor rendering quality okay? As
far as I know, while MLT is told to skip frames on playback, there should be no
difference in rendering quality when you don't use proxies. (Jean-Baptiste,
please correct me if I'm wrong!)

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Wegwerf via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361976

Wegwerf  changed:

   What|Removed |Added

 CC||wegwerf-1-...@gmx.de

--- Comment #9 from Wegwerf  ---
Jesse, the bitrate doesn't affect Kdenlive, but instead ffmpeg as it is used to
encode the individual rendered frames (audio+video). So if it's a rendering
issue, then I would guess it's rather in ffmpeg's ballpark. Unless there is a
severe loss of frame(!) quality while frames pass through MLT from the
producers (ffmpeg) to the consumer (ffmpeg, again). Did you try to render with
more relaxed bitrate settings?

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Jesse via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361976

--- Comment #8 from Jesse  ---
I'm still doing some testing to see if the clips still have the
artifacts/distortions with a lower bit-rate when Blender is rendering. Will
post more soon.

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[kdenlive] [Bug 361976] git master (re-opened) - Playback of certain video files produces large distortion artifacts (video example & sample footage included)

[Jesse via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361976

Jesse  changed:

   What|Removed |Added

   Severity|major   |normal
Summary|16.07.70 git master -   |git master (re-opened) -
   |rendering from .mp4 h.264   |Playback of certain video
   |footage produces large  |files produces large
   |distortion artifacts (video |distortion artifacts (video
   |example & sample footage|example & sample footage
   |included)   |included)
   Platform|Ubuntu Packages |Mint (Ubuntu based)

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