https://bugs.kde.org/show_bug.cgi?id=411261
Bug ID: 411261
Summary: Rendering dialog does not recognize MKV file format on
initial load
Product: kdenlive
Version: 19.08.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: User Interface
Assignee: j...@kdenlive.org
Reporter: c6kargn...@liamekaens.com
Target Milestone: ---
Created attachment 122331
--> https://bugs.kde.org/attachment.cgi?id=122331&action=edit
Screenshot of the "Rendering" dialog with "f=mkv" format after restarting
kdenlive.
SUMMARY
If a custom render format is created with "f=mkv", then it can be used to
render output. However, when kdenlive is restarted, the "Rendering" dialog no
longer recognizes the custom format as valid. Editing the format and saving it
with no changes restores it to usability. This happens only with "f=mkv" and
not with "f=matroska". Both "mkv" and "matroska" are listed as supported
formats by "melt -query formats".
STEPS TO REPRODUCE
1. Open the Rendering dialog (Ctrl-Enter).
2. Create a custom render format that specifies "f=mkv", such as:
properties=x264-medium f=mkv vcodec=libx264 acodec=flac g=120 crf=9
global_quality=500 me_method=umh
3. Save this format.
4. Exit kdenlive.
5. Restart kdenlive.
6. Re-open the "Rendering" dialog.
OBSERVED RESULT
The custom format with "f=mkv" is displayed with a glyph of an 'x' in a red
circle, and the window contains a panel near the bottom (orange with the Breeze
Dark colour scheme) with the text "Unspported video format: mkv". If the custom
format is selected, the pencil icon is clicked to edit it, and the "Edit
Profile" dialog is closed by clicking "OK" with no changes, then the custom
format changes to a recognized format. If there are multiple custom formats
with "f=mkv", then they all become recognized simultaneously.
EXPECTED RESULT
The custom format with "f=mkv" should be listed as a valid custom format
immediately upon first opening the "Rendering" dialog.
SOFTWARE/OS VERSIONS
Windows: Windows 10 1903
KDE Frameworks Version: 5.61.0
Qt Version: 5.13.0
ADDITIONAL INFORMATION
In bug 384148, it is mentioned that "mkv" isn't a valid format for ffmpeg, and
to use "matroska" instead. However, it is my understanding that the render
properties for a custom format are passed to MELT not ffmpeg, and MELT lists
both "mkv" and "matroska" as valid formats. Either way, there is a consistency
problem, because editing and re-saving the custom format clears the error.
Either the error shouldn't have been there in the first place, or re-saving the
profile shouldn't fix it. I feel like it should be the latter, since I render
using "f=mkv" regularly.
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