ffmpeg mov_text subtitle too small when converting mkv to mp4 I want to remux a mkv file into mp4.
I used the following command.
ffmpeg -i &quot;input.mkv&quot; -c:v copy -c:a copy -map 0:0 -map 0:1 -map 0:2 -map 0:3 -c:s mov_text &quot;output.mp4&quot;

Problem: The subtitles in the output.mp4 file are way too small.
Also, the subtitles of the mp4 file are unaffected when I try to make them bigger from vlc preferences.
I can turn them on/off but I think they are somewhat hardcoded.
I had to rencode subtitles while remuxing as otherwise it was showing error.
Also, I'm using the latest version of mmpeg.
input.mkv : 

output.mp4 :


input.mkv has the following streams,codecs : 

I searched a lot, but couldn't find a way to make mov_text subtitles bigger. How can I make them bigger?
Or Please suggest any other way to retain the subtitles while remuxing from mkv to mp4.
I consider subtitle text rendering is part of the player feature. If you are using VLC, may this link, https://wiki.videolan.org/VLC_HowTo/Adjust_subtitle_font_settings/, help?
I had tried on a mkv to mp4 video, before

After, I changed the VLC subtitle font size to larger, exited the program and replayed it again, i got