I'm kind of at a loss on how to do this. I have access to gimp/inkscape/ffmpeg/vlc, and I can download font styles as needed off the web.
So I have a movie. I play the movie in vlc player, I display the subtitles.
What I need is to take the displayed subtitles, change what they say and make them into an image overlay. So png RGBA I suppose, so I can overlay them onto a different scene. In other words I want to recreate the font and spacing and all the characteristics displayed in vlc.
Calling it up in ffmpeg: The movie contains the sub file as a .ass file. As well as a single .ttf attachment stream. All I know is that those .ttf streams contain formatting information that make the text look the way it does, I'm unsure what to do with it though. I can separate the .ass stream out of the container with ffmpeg and open it in a text editor. I look at it and I think this is the information I want to use to create new text in the style:
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding Style: Main,Open Sans Semibold,36,&H00FFFFFF,&H000000FF,&H00020713,&H00000000,-1,0,0,0,100,100,0,0,1,1.7,0,2,0,0,28,1
I don't know what to do with this information though.
In inkscape I create text and go through my fonts and apply a stroke with differing thickness and nothing comes close to the desired font, which seems to be the default vlc player subtitle font shared across many movies i tryout.
I get the feeling there is a much better and easier way to go about doing this. Can I create an overlay with this info as desired with ffmpeg? That would be great.
Edit: I tried this on the isolated subfile.ass, figuring I could just modify the .ass file with the new text I want if this worked. I got it to work, but the formatting is still a bit off. I need whatever is in the .ttf stream to do its thing here, not sure how to include it in the command.
ffmpeg -ss 00:01:87 -f lavfi -i "firstname.lastname@example.org:size=1920x1080,format=rgba,subtitles=subfile.ass:alpha=1" -frames:v 1 out.png
Edit: I read that the Stream # 0:3: Attachment: ttf is just a font style and doesn't contain positioning or anything other than teh font incase u don't already have it. So the solution would be to grab that file and put it in my windows font folder? I tried to grab it out using:
ffmpeg -i input.mkv -map 0:3 -c:t copy output.ttf
But it says .ttf isn't the right extension to use. How do you export .ttf files out of a video?