ffmpeg mov_text subtitle too small when converting 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