[BUG] mkvmerge sudden stop

[Selur]

Debug output doesn't really show an issue:

2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: adjusted ProcessEnvironmentOfProcess(C:\Program Files\Hybrid\64bit\mkvmerge.exe),...
2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: SubJobHandler - Starting main call: "C:\Program Files\Hybrid\64bit\mkvmerge.exe" --ui-language en -o "I:\2025-03-02@01_46_07_5010__10.mkv" --global-tags "I:\TEMP\mkvtags_2025-03-02@01_46_07_5010__10.xml" --default-track 0:yes --color-matrix-coefficients 0:1 --color-range 0:1 --color-transfer-characteristics 0:1 --color-primaries 0:1 --default-duration "0:50/1fps" --aspect-ratio-factor 0:1/1 --no-chapters --compression -1:none --forced-track 0:yes --field-order 0:0 --no-audio --no-subtitles "I:\TEMP\tape4_new_1_2025-03-02@01_46_07_5010_08.mkv" --track-name 0:"Track1" --default-track 0:yes --forced-track 0:no -a 0 --compression -1:none --no-video --no-subtitles --no-chapters "I:\TEMP\iId_1_aid_0_2025-03-02@01_46_07_5010_05.flac" --track-order 0:1,1:2
2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: mkvmerge v90.0 ('Hanging On') 64-bit

2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: 'I:\TEMP\tape4_new_1_2025-03-02@01_46_07_5010_08.mkv': Using the demultiplexer for the format 'Matroska'.
+-> Parsing the FLAC file. This can take a LONG time.

2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: +-> Pre-parsing FLAC file: 0%

2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: +-> Pre-parsing FLAC file: 5%

2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: +-> Pre-parsing FLAC file: 10%
...
2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: +-> Pre-parsing FLAC file: 100%


2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: 'I:\TEMP\iId_1_aid_0_2025-03-02@01_46_07_5010_05.flac': Using the demultiplexer for the format 'FLAC'.

2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: 'I:\TEMP\tape4_new_1_2025-03-02@01_46_07_5010_08.mkv' track 0: Using the output module for the format 'VfW compatible video'.
'I:\TEMP\iId_1_aid_0_2025-03-02@01_46_07_5010_05.flac' track 0: Using the output module for the format 'FLAC'.
The file 'I:\2025-03-02@01_46_07_5010__10.mkv' has been opened for writing.

2025.03.02 - 01:57:56_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: Progress: 0%
....
2025.03.02 - 01:58:19_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: 2025-03-02@01_46_07_5010_11_muxing: 48
2025.03.02 - 01:58:20_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: Progress: 49%

2025.03.02 - 01:58:20_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: 2025-03-02@01_46_07_5010_11_muxing: 49
2025.03.02 - 01:58:20_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: Progress: 50%

2025.03.02 - 01:58:20_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: 2025-03-02@01_46_07_5010_11_muxing: 50
2025.03.02 - 01:58:21_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: MkvMerge output: Progress: 51%

2025.03.02 - 01:58:21_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: 2025-03-02@01_46_07_5010_11_muxing: 51
2025.03.02 - 01:59:49_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: got close event,..
2025.03.02 - 01:59:50_Windows 10 Version 21H2 (64bit)_2025.02.28.1 - level 9: warnBeforeClose->close

It does mention "Parsing the FLAC file. This can take a LONG time." but no clue what could be the problem. Since the parsing was over.
You could try whether it also happens with an older version: https://mkvtoolnix.download/windows/releases/
Doesn't seem to be a bug in Hybrid itself. (not sure whether mkvmerge before also used vfw wrapper for ffv1,..)

Cu Selur