cannot generate video with embedded subtitles

[khocking00]

There was a thread about this topic 4 years ago that was closed with a "wait for an update" post. I have two machines, one will generate the embedded subtitles but the other one will not. The error log file says:

Date: 09/07/2025 18:40:13
SE: 4.0.13.0 - Microsoft Windows NT 10.0.26100.0 - 64-bit
Message: InitializeVideoPlayerAndContainer failed to load video player

System.Runtime.InteropServices.COMException
Message: Class not registered

Class not registered

StackTrace: at QuartzTypeLib.IMediaControl.RenderFile(String strFilename)
at Nikse.SubtitleEdit.Logic.VideoPlayers.QuartsPlayer.Initialize(Control ownerControl, String videoFileName, EventHandler onVideoLoaded, EventHandler onVideoEnded)
at Nikse.SubtitleEdit.Logic.UiUtil.DoInitializeVideoPlayer(String fileName, VideoInfo videoInfo, VideoPlayerContainer videoPlayerContainer, EventHandler onVideoLoaded, EventHandler onVideoEnded)
at Nikse.SubtitleEdit.Logic.UiUtil.InitializeVideoPlayerAndContainer(String fileName, VideoInfo videoInfo, VideoPlayerContainer videoPlayerContainer, EventHandler onVideoLoaded, EventHandler onVideoEnded)

My settings:

Can someone tell me how I can fix this? Thanks

[niksedk]

Looks a bit weird. You are getting an error about DirectShow (Quartz) but you're using mpv?
Try redownloading mpv.

[khocking00]

As suggested, I redownloaded mpv and tried again. Here is the error_log.txt in its entirety:

Date: 09/10/2025 17:46:24
SE: 4.0.13.0 - Microsoft Windows NT 10.0.26100.0 - 64-bit
Message:
Generate embedded video failed:
Target file name: V:\Lewis\Lewis subtitles\Series 6\603 - Fearful Symmetry-embed.mkv
ffmpeg arguments: -i "V:\Lewis\603 - Fearful Symmetry.mkv" -i "C:\Users\khock\AppData\Local\Temp\cf22b39e-ed77-4956-abf5-370fb37ce4b4\603 - Fearful Symmetry.srt" -map 0 -map -0:2 -map 1 -c copy -metadata:s:s:0 language="eng" -metadata:s:s:0 title="English" -disposition:s:s:0 default "V:\Lewis\Lewis subtitles\Series 6\603 - Fearful Symmetry-embed.mkv"
ffmpeg version 2025-03-31-git-35c091f4b7-essentials_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --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-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
libavutil 60. 0.100 / 60. 0.100
libavcodec 62. 0.100 / 62. 0.100
libavformat 62. 0.100 / 62. 0.100
libavdevice 62. 0.100 / 62. 0.100
libavfilter 11. 0.100 / 11. 0.100
libswscale 9. 0.100 / 9. 0.100
libswresample 6. 0.100 / 6. 0.100
libpostproc 59. 0.100 / 59. 0.100
Input #0, matroska,webm, from 'V:\Lewis\603 - Fearful Symmetry.mkv':
Metadata:
ENCODER : Lavf60.16.100
Duration: 01:29:14.96, start: 0.000000, bitrate: 4178 kb/s
Stream #0:0(eng): Audio: aac (LC), 48000 Hz, stereo, fltp (default)
Metadata:
BPS : 146789
BPS-eng : 146789
DURATION-eng : 01:29:06.816000000
NUMBER_OF_FRAMES: 250632
NUMBER_OF_FRAMES-eng: 250632
NUMBER_OF_BYTES : 98106782
NUMBER_OF_BYTES-eng: 98106782
_STATISTICS_WRITING_APP: mkvmerge v7.8.0 ('River Man') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v7.8.0 ('River Man') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-01-10 02:25:59
_STATISTICS_WRITING_DATE_UTC-eng: 2016-01-10 02:25:59
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
DURATION : 01:29:06.816000000
Stream #0:1(eng): Video: h264 (Main), yuv420p(tv, bt709, progressive), 960x718 [SAR 4:3 DAR 640:359], 25 fps, 25 tbr, 1k tbn (default)
Metadata:
BPS : 4033987
BPS-eng : 4033987
DURATION-eng : 01:29:06.800000000
NUMBER_OF_FRAMES: 133670
NUMBER_OF_FRAMES-eng: 133670
NUMBER_OF_BYTES : 2696115355
NUMBER_OF_BYTES-eng: 2696115355
_STATISTICS_WRITING_APP: mkvmerge v7.8.0 ('River Man') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v7.8.0 ('River Man') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-01-10 02:25:59
_STATISTICS_WRITING_DATE_UTC-eng: 2016-01-10 02:25:59
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
DURATION : 01:29:06.800000000
Stream #0:2(eng): Subtitle: subrip (srt) (default)
Metadata:
title : English
DURATION : 01:29:14.960000000
Input #1, srt, from 'C:\Users\khock\AppData\Local\Temp\cf22b39e-ed77-4956-abf5-370fb37ce4b4\603 - Fearful Symmetry.srt':
Duration: N/A, bitrate: N/A
Stream #1:0: Subtitle: subrip (srt)
Stream type specified multiple times
Error parsing options for output file V:\Lewis\Lewis subtitles\Series 6\603 - Fearful Symmetry-embed.mkv.
Error opening output files: Invalid argument

[khocking00]

I re-downloaded mpv as suggested and I still have trouble.

Here is another error log copy, of a different file I'm trying to embed:

Date: 09/14/2025 18:02:12
SE: 4.0.13.0 - Microsoft Windows NT 10.0.26100.0 - 64-bit
Message:
Generate embedded video failed:
Target file name: D:\OneDrive\File transfers\Annika - Series 1 (2021) [1080p mp4 subs]\102.mkv
ffmpeg arguments: -i "D:\OneDrive\File transfers\Annika - Series 1 (2021) [1080p mp4 subs]\Annika S01E02 (Aug 24 2021) [1080p mp4].mp4" -i "C:\Users\khock\AppData\Local\Temp\116c7901-6c0a-4532-874b-1a468d3508d9\Annika S01E02 (Aug 24 2021) [1080p mp4].srt" -map 0:a -map 0:v -map 1 -c copy -metadata:s:s:0 language="eng" -metadata:s:s:0 title="English" -disposition:s:s:0 default "D:\OneDrive\File transfers\Annika - Series 1 (2021) [1080p mp4 subs]\102.mkv"
ffmpeg version 2025-03-31-git-35c091f4b7-essentials_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --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-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
libavutil 60. 0.100 / 60. 0.100
libavcodec 62. 0.100 / 62. 0.100
libavformat 62. 0.100 / 62. 0.100
libavdevice 62. 0.100 / 62. 0.100
libavfilter 11. 0.100 / 11. 0.100
libswscale 9. 0.100 / 9. 0.100
libswresample 6. 0.100 / 6. 0.100
libpostproc 59. 0.100 / 59. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\OneDrive\File transfers\Annika - Series 1 (2021) [1080p mp4 subs]\Annika S01E02 (Aug 24 2021) [1080p mp4].mp4':
Metadata:
major_brand : mp42
minor_version : 512
compatible_brands: mp42iso2avc1mp41
creation_time : 2023-08-13T15:19:02.000000Z
encoder : HandBrake 1.4.2 2021100300
Duration: 00:47:28.20, start: 0.000000, bitrate: 5665 kb/s
Stream #0:00x1: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 5466 kb/s, 25 fps, 25 tbr, 90k tbn (default)
Metadata:
creation_time : 2023-08-13T15:19:02.000000Z
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream #0:10x2: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)
Metadata:
creation_time : 2023-08-13T15:19:02.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Input #1, srt, from 'C:\Users\khock\AppData\Local\Temp\116c7901-6c0a-4532-874b-1a468d3508d9\Annika S01E02 (Aug 24 2021) [1080p mp4].srt':
Duration: N/A, bitrate: N/A
Stream #1:0: Subtitle: subrip (srt)
Stream type specified multiple times
Error parsing options for output file D:\OneDrive\File transfers\Annika - Series 1 (2021) [1080p mp4 subs]\102.mkv.
Error opening output files: Invalid argument