Some filetypes fail to start encoding

**FastFlix Version:**
6.2.1

**Operating System:**
Windows 11 25h2

**Describe the bug**
.mpeg (h264) and .mov (hevc, prores hq, etc...) fail to start encoding

**To Reproduce**
use any video with file extension using .mov or .mpeg and it always fail to start encoding

**Logs** (If applicable) In FastFlix you can go to Help > Open Log Directory and sort by latest to find the newest log file to add here.

2026-04-10 11:37:58,855 - Using work dir: C:\Users\ProtoX1-W10\AppData\Roaming\FastFlix\temp_20260410_3888cce162b3c926
2026-04-10 11:37:58,855 - command output file set to: C:\Users\ProtoX1-W10\AppData\Roaming\FastFlix\temp_20260410_3888cce162b3c926\encoder_output_4c0599ecb5f0.log
2026-04-10 11:37:58,856 - command error output file set to: C:\Users\ProtoX1-W10\AppData\Roaming\FastFlix\temp_20260410_3888cce162b3c926\encoder_error_output_b81ac7ac2a23.log
2026-04-10 11:37:58,856 - Running command: ['C:\\Users\\ProtoX1-W10\\AppData\\Roaming\\FFmpeg\\bin\\ffmpeg.exe', '-y', '-i', 'F:\\Untitled457456456.mov', '-max_muxing_queue_size', '1024', '-map', '0:0', '-c:v', 'libsvtav1', '-pix_fmt', 'yuv420p10le', '-preset', '7', '-color_primaries', 'bt709', '-color_trc', 'bt709', '-colorspace', 'bt709', '-svtav1-params', 'tile-columns=0:tile-rows=0:scd=0', '-crf', '24', '-map_metadata', '-1', '-map_chapters', '0', '-map', '0:1', '-metadata:s:1', 'title=', '-metadata:s:1', 'handler=', '-c:1', 'copy', '-disposition:1', 'default', '-default_mode', 'infer_no_subs', '-map', '0:2', '-c:d', 'copy', 'F:\\Untitled457456456-fastflix-9e79.mkv']
2026-04-10 11:37:58,860 - Set command priority to Normal
2026-04-10 11:37:58,892 - ffmpeg version 8.1-full_build-www.gyan.dev Copyright (c) 2000-2026 the FFmpeg developers
2026-04-10 11:37:58,903 - built with gcc 15.2.0 (Rev11, Built by MSYS2 project)
2026-04-10 11:37:58,914 - 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
2026-04-10 11:37:58,925 - libavutil 60. 26.100 / 60. 26.100
2026-04-10 11:37:58,936 - libavcodec 62. 28.100 / 62. 28.100
2026-04-10 11:37:58,946 - libavformat 62. 12.100 / 62. 12.100
2026-04-10 11:37:58,957 - libavdevice 62. 3.100 / 62. 3.100
2026-04-10 11:37:58,968 - libavfilter 11. 14.100 / 11. 14.100
2026-04-10 11:37:58,979 - libswscale 9. 5.100 / 9. 5.100
2026-04-10 11:37:58,990 - libswresample 6. 3.100 / 6. 3.100
2026-04-10 11:37:59,001 - Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'F:\Untitled457456456.mov':
2026-04-10 11:37:59,012 - Metadata:
2026-04-10 11:37:59,023 - major_brand : qt
2026-04-10 11:37:59,034 - minor_version : 512
2026-04-10 11:37:59,045 - compatible_brands: qt
2026-04-10 11:37:59,056 - creation_time : 2026-04-05T18:47:04.000000Z
2026-04-10 11:37:59,067 - encoder : Blackmagic Design DaVinci Resolve Studio
2026-04-10 11:37:59,078 - Duration: 00:00:12.46, start: 0.000000, bitrate: 3921 kb/s
2026-04-10 11:37:59,088 - Stream #0:0[0x1]: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 3787 kb/s, 24 fps, 24 tbr, 12288 tbn (default)
2026-04-10 11:37:59,099 - Metadata:
2026-04-10 11:37:59,110 - creation_time : 2026-04-05T18:47:04.000000Z
2026-04-10 11:37:59,121 - handler_name : VideoHandler
2026-04-10 11:37:59,132 - vendor_id :
2026-04-10 11:37:59,142 - encoder : H.265 8-bit - NVIDIA
2026-04-10 11:37:59,153 - timecode : 01:00:00:00
2026-04-10 11:37:59,164 - Stream #0:1[0x2]: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
2026-04-10 11:37:59,175 - Metadata:
2026-04-10 11:37:59,186 - creation_time : 2026-04-05T18:47:04.000000Z
2026-04-10 11:37:59,196 - handler_name : SoundHandler
2026-04-10 11:37:59,207 - vendor_id : [0][0][0][0]
2026-04-10 11:37:59,218 - Stream #0:2[0x3](eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
2026-04-10 11:37:59,229 - Metadata:
2026-04-10 11:37:59,240 - creation_time : 2026-04-05T18:47:04.000000Z
2026-04-10 11:37:59,251 - handler_name : TimeCodeHandler
2026-04-10 11:37:59,262 - timecode : 01:00:00:00
2026-04-10 11:37:59,273 - Stream mapping:
2026-04-10 11:37:59,284 -
2026-04-10 11:37:59,285 - Stream #0:0 -> #0:0 (hevc (native) -> av1 (libsvtav1))
Stream #0:1 -> #0:1 (copy)
Stream #0:2 -> #0:2 (copy)
Press [q] to stop, [?] for help
Svt[info]: -------------------------------------------
Svt[info]: SVT [version]: SVT-AV1 Encoder Lib v4.0.1-131-g003643d4
Svt[info]: SVT [build] : GCC 15.2.0 64 bit
Svt[info]: LIB Build date: Mar 15 2026 10:44:46
Svt[info]: -------------------------------------------
Svt[info]: Level of Parallelism: 6
Svt[info]: Number of PPCS 305
Svt[info]: [asm level on system : up to avx512icl]
Svt[info]: [asm level selected : up to avx512icl]
Svt[info]: -------------------------------------------
Svt[info]: SVT [config]: main profile tier (auto) level (auto)
Svt[info]: SVT [config]: width / height / fps numerator / fps denominator : 1920 / 1080 / 24 / 1
Svt[info]: SVT [config]: bit-depth / color format : 10 / YUV420
Svt[info]: SVT [config]: preset / tune / pred struct : 7 / PSNR / random access
Svt[info]: SVT [config]: gop size / mini-gop size / key-frame type : 161 / 32 / key frame
Svt[info]: SVT [config]: BRC mode / rate factor : CRF / 24.00
Svt[info]: SVT [config]: AQ mode / Variance Boost : 2 / 0
Svt[info]: SVT [config]: sharpness / luminance-based QP bias : 0 / 0
Svt[info]: SVT [config]: QP scale compress strength : 0
Svt[info]: -------------------------------------------
[matroska @ 00000227d2b84940] Only audio, video, and subtitles are supported for Matroska.
[out#0/matroska @ 00000227d2bde640] Could not write header (incorrect codec parameters ?): Invalid argument
[vf#0:0 @ 00000227d2b7c4c0] Error sending frames to consumers: Invalid argument
[vf#0:0 @ 00000227d2b7c4c0] Task finished with error code: -22 (Invalid argument)
[vf#0:0 @ 00000227d2b7c4c0] Terminating thread with return code -22 (Invalid argument)
[out#0/matroska @ 00000227d2bde640] Nothing was written into output file, because at least one of its streams received no packets.
frame= 0 fps=0.0 q=0.0 Lsize= 0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:00.24
Conversion failed!