I'm trying to burn .ass subtitles onto a .webm, using ffmpeg -i input.webm -vf ass=subtitles.ass output.webm but it shrinks from like 150MB to 9MB. How do I add the subtitles without losing quality ?
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2Do you want to mux the subtitles or burn them?– GyanCommented May 14, 2019 at 8:51
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Burn -- based on trac.ffmpeg.org/wiki/HowToBurnSubtitlesIntoVideo– JonCommented May 14, 2019 at 20:52
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1 Answer
Use
ffmpeg -i input.webm -vf ass=subtitles.ass -b:v 0 -crf 20 output.webm
The libvpx encoders for WebM, by default, perform Constrained Quality encoding, and use the bitrate as a ceiling. Default bitrate is 200 kbps. To remove bitrate ceiling, set bitrate to 0. -crf controls the quality level.
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2@Jon, so why you don't accept this answer? Click on check mark near it.– MarianDCommented May 16, 2019 at 21:06