[kdenlive] [Bug 382605] New: Exported video has lag or stutter on 4k

[Joel G]

https://bugs.kde.org/show_bug.cgi?id=382605

Bug ID: 382605
Summary: Exported video has lag or stutter on 4k
Product: kdenlive
Version: 17.04.3
Platform: Archlinux Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: ***@kdenlive.org
Reporter: ***@gmail.com
Target Milestone: ---

When working with high quality photos for timelapse projects, once the video
has been exported, the output video has a feeling of lag or stutter. As if
several frames had been dropped.

I've been using 5184x3456 JPG images to create timelapses. Ideally I try to use
4k UHD projects but more often than not (maybe 80% of the time) the video
results in a lagged or stutter artifiact mostly at the beginning of the video.
This unwanted playback diminishes at 2k (around 10%), and is not present at
FullHD (1080).

I have not made enough tests to decide if having edits (saturation, sharpen,
curves) have a significant effect on the results above but I believe so. I can
say that FPSs doesn't seem to affect this problem though.

I have ~20 different set of timelapse photos to put together, I've been able to
notice this pattern very consistently. Whenever the 4k attempt has artifacts I
go down to 2k to go around it but it effectively means I'm not able to output
reliable 4k videos.

Not sure how to provide debug logs but will keep an eye on this in case someone
can provide some instructions.

[Joel G]

https://bugs.kde.org/show_bug.cgi?id=382605

--- Comment #1 from Joel G <***@gmail.com> ---
@jb I have now come to learn that this lag is an experience of my laptop and
not reporduceable in other computers which better handle 4K video files.
I am not familiar with graphic stack in linu but I wonder if Wayland has sth to
do with it.
Regardless, this has now proven to be unrelated to Kdenlive. This bug can be
disregarded.

[emohr]

https://bugs.kde.org/show_bug.cgi?id=382605

emohr <***@gmx.net> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |***@gmx.net
Status|REPORTED |NEEDSINFO
Flags| |timeline_corruption+
Resolution|--- |WAITINGFORINFO

--- Comment #2 from emohr <***@gmx.net> ---
Do you still encounter this problem with the newest Kdenlive version 18.08.3?