I’ve been using ffmpeg to do everything so far with a video, stringing animation frames together, adding audio, overlaying images, and adding subtitles. So I expect that the answer to my question still lies within ffmpeg, but I’m open to using other programs if necessary.
I already created the ASS subtitle files (plural for multiple languages), taking advantage of the font, color, and positioning info. But when I went to add one of them to the video it lost all of that formatting info. The only way I’ve found to preserve that information with ffmpeg is to hard-sub, rendering the text permanently into the video, but I want the viewer to be able to switch between languages.
This is what I do currently:
ffmpeg \
-i video_in.mp4 -i sub_eng.ass -i sub_spa.ass \
-c copy -c:s mov_text \
-map 0:v -map 0:a -map 1 -map 2 \
-metadata:s:s:0 language=eng \
-metadata:s:s:1 language=spa \
video_out.mp4
Is there a way to soft-sub a video with position information? Each line in the subtitles has its own position (mimicking a speech bubble to denote who’s speaking).
EDIT: Partial Solution with MKV from Gyan
ffmpeg \
-i video_in.mkv -i sub_eng.ass -i sub_spa.ass \
-c copy \
-map 0:v -map 0:a -map 1 -map 2 \
-metadata:s:s:0 language=eng \
-metadata:s:s:1 language=spa \
video_out.mkv
