Bug 510274

Summary:	[AUR BUILD] Encountering [filter avfilter.subtitles ] Unexpected return format" error
Product:	[Applications] kdenlive	Reporter:	zstephens0624
Component:	Title Clips & Subtitles	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED FIXED
Severity:	major	CC:	fridolin.411, mrkvacgts
Priority:	NOR
Version First Reported In:	25.08.1
Target Milestone:	---
Platform:	EndeavourOS
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description zstephens0624 2025-10-05 17:58:24 UTC

SUMMARY
Returned to my project to see all my subtitles failing to render.

STEPS TO REPRODUCE*
1. Update system files (restart)
2. Create new subtitles (or load old ones)

OBSERVED RESULT
Subtitles failing to render, "[filter avfilter.subtitles ] Unexpected return format" error detailed in Effect/Composition Stack

EXPECTED RESULT
Subtitles rendering, no error.

SOFTWARE/OS VERSIONS
Latest EndeavourOS Arch build, latest KDE Plasma version as the desktop environment.

ADDITIONAL INFORMATION
This error does not occur in the appimage version, which is what I use now. (Ty KDE Matrix chatroom)

* I do not know the exact steps to reproduce this, and I don't have the knowledge to figure it out without spending hours figuratively breaking a brick wall. All I know is it happened after running a system update and restarting.

Comment 1 twoexem 2025-10-19 19:18:50 UTC

Same issue here.

System info:
Operating System: Arch Linux 
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.2-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 64 GiB of RAM (62.7 GiB usable)
Graphics Processor: AMD Radeon RX 7800 XT
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7C56
System Version: 1.0

Kdenlive version: 25.08.2

Comment 2 Jean-Baptiste Mardelle 2025-10-21 12:31:21 UTC

Can you please confirm which FFmpeg version is installed on your system ?

Comment 3 twoexem 2025-10-22 06:26:03 UTC

(In reply to Jean-Baptiste Mardelle from comment #2)
> Can you please confirm which FFmpeg version is installed on your system ?

Installed is ffmpeg 2:8.0-3.

Comment 4 Jean-Baptiste Mardelle 2025-10-26 03:14:46 UTC

Thanks. This was an upstream issue in MLT, now fixed in MLT git, see;
https://github.com/mltframework/mlt/issues/1165

Comment 5 Jean-Baptiste Mardelle 2025-10-26 05:13:51 UTC

*** Bug 511138 has been marked as a duplicate of this bug. ***

Comment 6 Antonio Rojas 2025-10-26 07:52:03 UTC

*** Bug 511139 has been marked as a duplicate of this bug. ***