Video converts fine, but Output directory keeps showing [Muxing Failed]

[wangsuki]

Video converts fine, but Output directory keeps showing [Muxing Failed] even though I selected the right Output directory in IFME 8.6, and folder exists in my V Drive (external SSD).

Here's part of the log:

[INFO] Multiplexing encoded files into single file...
[out#0/matroska @ 0000019e83b94c00] Could not open attachment file C:\IFME-8.6.0-win64\attachment\GandhiSans-Bold.otf.
Error opening output file V:\Videos- IFME[IFME2] [neoDESU] Solo Leveling S2 - 09 (BD) (1).mkv.
Error opening output files: No such file or directory
[ERROR] FFmpeg failed to multiplex files. Check the [Muxing Failed] directory for manual processing.
[DEBUG] FFmpeg exit code: -2

[Anime4000]

it appears that:

[out#0/matroska @ 0000019e83b94c00] Could not open attachment file C:\IFME-8.6.0-win64\attachment\GandhiSans-Bold.otf

the file was not there, I wondering, do you move the temp folder aswell ?

[wangsuki]

The temp folder location: C:\Users<user name>\AppData\Local\Temp\IFME

I also have K-lite Codec Pack 19.2.5 Mega installed.

I did two tests:

Test without the GandhiSans-Bold font, and this is the error:

Internet Friendly Media Encoder 8.6 ( 'Nijika Melody' )
AMD Ryzen 9 6900HX with Radeon Graphics, MMX, SSE, SSE2, SSE3, SSSE3, SSE41, SSE42, AVX, AVX2, FMA3

(c) 2025 Anime4000, Rigaya, MulticoreWare, VideoLAN, IETF, Xiph.Org Foundation, Josh Coalson, Erik de Castro Lopo, Jean Le Feuvre, People@GPAC, FFmpeg Team, Nero AG, Moritz Bunkus, AMD, Intel, Nvidia, Google, Alliance for Open Media, et al.

(s) Nemu, Jel42, Robin Lawrie, Ron Mitschke, Project Angel

WARNING: Do not close this terminal - critical process information is displayed here.

[INFO] Plugin initialization completed successfully
[i18n] en-US @ Anime4000
[INFO] Extracting metadata...
[INFO] Extracting subtitle file...
[opus @ 000002afb5525a00] Error parsing Opus packet header.
[INFO] Extracting embeded attachment...
[INFO] Encoding audio file...
[opus @ 000002327ba79400] Error parsing Opus packet header.
[INFO] Encoding video file...
raw [info]: output file: raw-v0000_und.h265
x265 [info]: HEVC encoder version 4.1+1-32e25ffcf
x265 [info]: build info [Windows][GCC 14.2.0][64 bit] 10bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
x265 [info]: Main 10 profile, Level-4 (Main tier)
x265 [info]: Thread pool created using 16 threads
x265 [info]: Slices : 1
x265 [info]: frame threads / pool features : 4 / wpp(17 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge : star / 57 / 3 / 3
x265 [info]: Keyframe min / max / scenecut / bias : 23 / 250 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt : 25 / 4 / 2
x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 0
x265 [info]: References / ref-limit cu / depth : 4 / on / on
x265 [info]: AQ: mode / str / qg-size / cu-tree : 2 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress : CRF-22.0 / 0.60
x265 [info]: tools: rect limit-modes rd=4 psy-rd=2.00 rdoq=2 psy-rdoq=1.00
x265 [info]: tools: rskip mode=1 signhide tmvp strong-intra-smoothing lslices=4
x265 [info]: tools: deblock sao dhdr10-info
[opus @ 0000025fafbc8180] Error parsing Opus packet header.

x265 [info]: Weighted P-Frames: Y:0.2% UV:0.2%
[INFO] Restructure RAW video file...

OpenGOP detected - adjusting file brand
HEVC Import results: 2181 samples (2185 NALUs) - Slices: 24 I 832 P 1325 B - 1 SEI - 1 IDR - 20 CRA
HEVC Stream uses forward prediction - stream CTS offset: 4 frames
0.500 secs Interleaving

[INFO] Multiplexing encoded files into single file...
[out#0/matroska @ 0000018f04f66c80] Could not open attachment file C:\IFME-8.6.0-win64\attachment\arial.ttf.
Error opening output file V:\Videos- IFME[IFME2] [IFME2] [Rom & Rem] Yuru Yuri - NCED (BD).mkv.
Error opening output files: No such file or directory
[ERROR] FFmpeg failed to multiplex files. Check the [Muxing Failed] directory for manual processing.
[DEBUG] FFmpeg exit code: -2

Test done without any font attachments doesn't show any problems:

[INFO] Extracting metadata...
[INFO] Extracting subtitle file...
[opus @ 000001a9eb143cc0] Error parsing Opus packet header.
[INFO] Extracting embeded attachment...
[INFO] Encoding audio file...
[opus @ 0000013ae9734780] Error parsing Opus packet header.
[INFO] Encoding video file...
raw [info]: output file: raw-v0000_und.h265
x265 [info]: HEVC encoder version 4.1+1-32e25ffcf
x265 [info]: build info [Windows][GCC 14.2.0][64 bit] 10bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
x265 [info]: Main 10 profile, Level-4 (Main tier)
x265 [info]: Thread pool created using 16 threads
x265 [info]: Slices : 1
x265 [info]: frame threads / pool features : 4 / wpp(17 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge : star / 57 / 3 / 3
x265 [info]: Keyframe min / max / scenecut / bias : 23 / 250 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt : 25 / 4 / 2
x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 0
x265 [info]: References / ref-limit cu / depth : 4 / on / on
x265 [info]: AQ: mode / str / qg-size / cu-tree : 2 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress : CRF-22.0 / 0.60
x265 [info]: tools: rect limit-modes rd=4 psy-rd=2.00 rdoq=2 psy-rdoq=1.00
x265 [info]: tools: rskip mode=1 signhide tmvp strong-intra-smoothing lslices=4
x265 [info]: tools: deblock sao dhdr10-info
[opus @ 00000177bbdb4f00] Error parsing Opus packet header.

x265 [info]: Weighted P-Frames: Y:0.2% UV:0.2%
[INFO] Restructure RAW video file...

OpenGOP detected - adjusting file brand
HEVC Import results: 2181 samples (2185 NALUs) - Slices: 24 I 832 P 1325 B - 1 SEI - 1 IDR - 20 CRA
HEVC Stream uses forward prediction - stream CTS offset: 4 frames
0.500 secs Interleaving

[INFO] Multiplexing encoded files into single file...
[SUCCESS] Files multiplexed successfully
[DEBUG] FFmpeg exit code: 0

Conclusion: I'm guessing It seems like IFME or FFmpeg will fail to multiplex everything into mkv when there are font attachments.