Bug 409927

Summary: "Extract Frame" extracts the wrong frame
Product: [Applications] kdenlive Reporter: kdebugs
Component: User Interface & MiscellaneousAssignee: Jean-Baptiste Mardelle <jb>
Status: RESOLVED FIXED    
Severity: normal CC: jean-louis.pasturel, PVince81
Priority: NOR    
Version First Reported In: 19.04.3   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: https://invent.kde.org/kde/kdenlive/commit/dc3340cc67dfdc300a7177525fd3b808ad6c8fbc Version Fixed/Implemented In:
Sentry Crash Report:

Description kdebugs 2019-07-18 03:37:52 UTC 
SUMMARY
Extracting a frame from a clip in the clip monitor -- either "Extract Frame..." or "Extract Frame to Project..." -- extracts the wrong frame.  Especially towards the end of long clips.

STEPS TO REPRODUCE
1. Create a project (test project was 1280x720, 30 fps)
2. Add clip (test clip was 20:00:00 or so; 30.038 fps)
3. Select clip.
4. In clip monitor, navigate near end of clip.  Note frame image.
5. Extract frame


OBSERVED RESULT
Extracted frame is *not* the frame pictured in the clip monitor.

EXPECTED RESULT
Extracted frame is the frame pictured in the clip monitor.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: applimage
KDE Frameworks Version: appimage
Qt Version: appimage

ADDITIONAL INFORMATION
This *may* be related to the difference in frame rate between the project and the source clip.
Or it may not: transcoding the source clip to 30 fps still exhibits this behavior -- but not as severely (the extracted frame is "closer" to the frame pictured in the clip monitor; but still wrong).

This is *not* the same as bug 384538.  This is not using a proxy clip.
Comment 1 Pastjl 2019-07-26 08:12:26 UTC 
I found the same issue and waiting the correction.
The workaround is to put the clip in the timeline and extract the frame from the project monitor.
Comment 2 Jean-Baptiste Mardelle 2019-07-31 06:59:57 UTC 
Git commit dc3340cc67dfdc300a7177525fd3b808ad6c8fbc by Jean-Baptiste Mardelle.
Committed on 31/07/2019 at 06:59.
Pushed by mardelle into branch 'Applications/19.08'.

Fix extract frame retrieving wrong frame when clip fps != project fps

M  +2    -2    src/monitor/monitor.cpp
M  +7    -1    src/monitor/monitorproxy.cpp

https://invent.kde.org/kde/kdenlive/commit/dc3340cc67dfdc300a7177525fd3b808ad6c8fbc
Comment 3 Vincent Petry 2020-06-19 15:28:41 UTC 
Seems this issue still exists in 20.04.1b from Appimage.

Possible regression ?