#11602: Muxing MKV and adding external SRT as anything except the only subtitle
stream in an MKV prevents subtitle display in VLC
-------------------------------------+-------------------------------------
Reporter: Kurt | Type: defect
Fitzner |
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: mkv srt | Blocked By:
muxer remux |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
When re-muxing an MKV video that already has subtitle streams in it to add
an additional external subrip .srt file, if the external .srt is included
as anything except the only subtitle stream in the output then the added
external subtitle will not display in VLC or on a Roku media player.
You can select any number of existing subtitle stream from the input MKV
video and they will properly copy to the output and display when the video
is played.
The following produces videos where the added external subtitle DOES NOT
display, but where the subtitle stream included from the input .mkv DOES
display:
{{{
% ffmpeg -report -i invid.mkv -i 1b.srt -map 0:v? -c:v copy -map 0:a? -c:a
copy -map 0:s:0 -c:s:0 copy -map 1:s:0 -c:s:1 copy outvid1.mkv
% ffmpeg -report -i invid.mkv -i 1b.srt -map 0:v? -c:v copy -map 0:a? -c:a
copy -map 1:s:0 -c:s:0 copy -map 0:s:0 -c:s:1 copy outvid2.mkv
}}}
The following produces a video where the added external subtitle (the same
one as the above) DOES display properly:
{{{
% ffmpeg -i invid.mkv -i 1b.srt -map 0:v? -c:v copy -map 0:a? -c:a copy
-map 1:s:0 -c:s:0 copy outvid3.mkv
}}}
This was attempted on ffmpeg Windows 64 builds:
ffmpeg version 2025-05-07-git-1b643e3f65-full_build-www.gyan.dev
ffmpeg version 2025-05-19-git-c55d65ac0a-full_build-www.gyan.dev
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11602>
FFmpeg <https://ffmpeg.org>
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