Converting videos randomly breaks and ffmpeg process stuck

[lastmetroid]

Cant provide much infos but there is a bug that randomyl converting videos cause the process just to stop mid conversation and then the ffmpeg process is stuck and you need to force close it with task kill.

[Coleisforrobot]

Same here, the ffmpeg logs seem to just stop.

Sunday, July 19, 2026 7:12:34 PM

Convert file C:\Users\Cole\output.mp4 to C:\Users\Cole\output (3).mp4.
Execute command: C:\Program Files\File Converter\ffmpeg.exe -n -progress pipe:1  -i "C:\Users\Cole\output.mp4" -c:v libx264 -preset medium -crf 31 -c:a aac -qscale:a 0.75 -vf "scale=trunc(iw*1/2)*2:trunc(ih*1/2)*2,format=yuv420p" "C:\Users\Cole\output (3).mp4".

ffmpeg output: ffmpeg version 8.1.2-full_build-www.gyan.dev Copyright (c) 2000-2026 the FFmpeg developers
ffmpeg output:   built with gcc 16.1.0 (Rev2, Built by MSYS2 project)
ffmpeg output:   configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-cairo --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-liboapv --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libsvtjpegxs --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-openal --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint --enable-whisper
ffmpeg output:   libavutil      60. 26.102 / 60. 26.102
ffmpeg output:   libavcodec     62. 28.102 / 62. 28.102
ffmpeg output:   libavformat    62. 12.102 / 62. 12.102
ffmpeg output:   libavdevice    62.  3.102 / 62.  3.102
ffmpeg output:   libavfilter    11. 14.102 / 11. 14.102
ffmpeg output:   libswscale      9.  5.102 /  9.  5.102
ffmpeg output:   libswresample   6.  3.102 /  6.  3.102
ffmpeg output: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\Cole\output.mp4':
ffmpeg output:   Metadata:
ffmpeg output:     major_brand     : isom
ffmpeg output:     minor_version   : 512
ffmpeg output:     compatible_brands: isomiso2avc1mp41
ffmpeg output:     encoder         : Lavf62.12.102
ffmpeg output:   Duration: 00:01:35.30, start: 0.000000, bitrate: 4707 kb/s
ffmpeg output:   Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/bt709, top first), 720x576 [SAR 59:54 DAR 295:216], 4601 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
ffmpeg output:     Metadata:
ffmpeg output:       handler_name    : VideoHandler
ffmpeg output:       encoder         : Lavc62.28.102 libx264
ffmpeg output:   Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 100 kb/s (default)
ffmpeg output:     Metadata:
ffmpeg output:       handler_name    : SoundHandler
ffmpeg output: Stream mapping:
ffmpeg output:   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
ffmpeg output:   Stream #0:1 -> #0:1 (aac (native) -> aac (native))
ffmpeg output: Press [q] to stop, [?] for help
ffmpeg output: [libx264 @ 0000026bc8dc12c0] using SAR=59/54
ffmpeg output: [libx264 @ 0000026bc8dc12c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
ffmpeg output: [libx264 @ 0000026bc8dc12c0] profile High, level 3.0, 4:2:0, 8-bit
ffmpeg output: [libx264 @ 0000026bc8dc12c0] 264 - core 165 r3223 0480cb0 - H.264/MPEG-4 AVC codec - Copyleft 2003-2025 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=31.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
ffmpeg output: Output #0, mp4, to 'C:\Users\Cole\output (3).mp4':
ffmpeg output:   Metadata:
ffmpeg output:     major_brand     : isom
ffmpeg output:     minor_version   : 512
ffmpeg output:     compatible_brands: isomiso2avc1mp41
ffmpeg output:     encoder         : Lavf62.12.102
ffmpeg output:   Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/bt709, top coded first (swapped)), 720x576 [SAR 59:54 DAR 295:216], q=2-31, 25 fps, 12800 tbn (default)
ffmpeg output:     Metadata:
ffmpeg output:       encoder         : Lavc62.28.102 libx264
ffmpeg output:       handler_name    : VideoHandler
ffmpeg output:     Side data:
ffmpeg output:       CPB properties: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
ffmpeg output:   Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
ffmpeg output:     Metadata:
ffmpeg output:       encoder         : Lavc62.28.102 aac
ffmpeg output:       handler_name    : SoundHandler
ffmpeg output: frame=   88 fps=0.0 q=36.0 size=       0KiB time=00:00:03.44 bitrate=   0.1kbits/s speed= 6.6x elapsed=0:00:00.52    
ffmpeg output: frame=  188 fps=180 q=36.0 size=       0KiB time=00:00:07.44 bitrate=   0.1kbits/s speed=7.14x elapsed=0:00:01.04    
ffmpeg output: frame=  314 fps=201 q=36.0 size=     256KiB time=00:00:12.40 bitrate= 169.2kbits/s speed=7.96x elapsed=0:00:01.55    
ffmpeg output: frame=  458 fps=221 q=36.0 size=     512KiB time=00:00:18.24 bitrate= 230.0kbits/s speed=8.79x elapsed=0:00:02.07    
ffmpeg output: frame=  592 fps=228 q=36.0 size=     768KiB time=00:00:23.60 bitrate= 266.6kbits/s speed=9.09x elapsed=0:00:02.59    
ffmpeg output: frame=  702 fps=225 q=36.0 size=    1024KiB time=00:00:28.00 bitrate= 299.6kbits/s speed=8.99x elapsed=0:00:03.11    
ffmpeg output: frame=  818 fps=225 q=36.0 size=    1280KiB time=00:00:32.64 bitrate= 321.3kbits/s speed=8.99x elapsed=0:00:03.62    
ffmpeg output: frame=  912 fps=221 q=36.0 size=    1536KiB time=00:00:36.40 bitrate= 345.7kbits/s speed=8.81x elapsed=0:00:04.13    
ffmpeg output: frame= 1028 fps=221 q=36.0 size=    1792KiB time=00:00:41.04 bitrate= 357.7kbits/s speed=8.82x elapsed=0:00:04.65    
ffmpeg output: frame= 1142 fps=221 q=36.0 size=    2048KiB time=00:00:45.60 bitrate= 367.9kbits/s speed=8.83x elapsed=0:00:05.16    
ffmpeg output: frame= 1266 fps=223 q=36.0 size=    2304KiB time=00:00:50.56 bitrate= 373.3kbits/s speed=8.89x elapsed=0:00:05.68    
ffmpeg output: frame= 1387 fps=223 q=36.0 size=    2816KiB time=00:00:55.40 bitrate= 416.4kbits/s speed=8.91x elapsed=0:00:06.21    
ffmpeg output: frame= 1496 fps=222 q=36.0 size=    3072KiB time=00:00:59.76 bitrate= 421.1kbits/s speed=8.88x elapsed=0:00:06.72    
ffmpeg output: frame= 1617 fps=223 q=36.0 size=    3328KiB time=00:01:04.60 bitrate= 422.0kbits/s speed=8.91x elapsed=0:00:07.25    
ffmpeg output: frame= 1731 fps=223 q=36.0 size=    3584KiB time=00:01:09.04 bitrate= 425.3kbits/s speed=8.88x elapsed=0:00:07.77    
ffmpeg output: frame= 1843 fps=222 q=36.0 size=    3840KiB time=00:01:13.60 bitrate= 427.4kbits/s speed=8.86x elapsed=0:00:08.30    
ffmpeg output: frame= 1954 fps=221 q=36.0 size=    4096KiB time=00:01:18.04 bitrate= 430.0kbits/s speed=8.83x elapsed=0:00:08.83    
ffmpeg output: frame= 2064 fps=221 q=36.0 size=    4352KiB time=00:01:22.48 bitrate= 432.2kbits/s speed=8.82x elapsed=0:00:09.35    
ffmpeg output: frame= 2207 fps=223 q=36.0 size=    4608KiB time=00:01:28.20 bitrate= 428.0kbits/s speed=8.93x elapsed=0:00:09.88    
ffmpeg output: frame= 2337 fps=225 q=36.0 size=    4608KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:10.39    
ffmpeg output: [out#0/mp4 @ 0000026bc6beeac0] video:3675KiB audio:1176KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 1.455069%
ffmpeg output: frame= 2382 fps=228 q=-1.0 Lsize=    4922KiB time=00:01:35.20 bitrate= 423.5kbits/s speed=9.12x elapsed=0:00:10.43    

Attempting to delete the leftover half-finished video file tells me that ffmpeg is still using it. Weirdly something that seems to make it work better is copying my main ffmpeg binary into the File Converter directory, although after a bit it stops working again. I wonder if FC is bundling a broken ffmpeg build?

[Ccode-lang]

Same problem here. Same output as above.

[Miamlya]

Same

[thetechfirm]

same here. going back a version

[thetechfirm]

just tried ver 2.1 and it worked

[lastmetroid]

Still no word from the devs, what is this? This is a major issue and renders this application unusable and totally broken, and you never noticed it so far?

[thetechfirm]

im fine with ver 2.1 and it works