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I'm new to ffmpeg, sorry if this was asked before already but I can't find the exact solution I'm looking for.

So I have a 250MB .mkv file with subs

And I want to turn it into a .mp4 file with burned in subtitles.

I have found this solution FFMPEG mkv to mp4 conversion loses subtitles

Where they offer:

ffmpeg -i input.mkv -vf subtitles=input.mkv output.mp4

Which works!

But, that makes me end up with 180MB .mp4 file that takes a very noticable hit to the quality with a lot of squares/artifacts popping up in motion on the video.

Is there way similar to this option? ffmpeg -i input.mkv -c copy -c:s mov_text output.mp4

Where I still get a .mp4 file with burned in subtitles but the audio and video quality are the same as source? With the same bitrate and also constant and not variable framerate?

Thank you!

lain137
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1 Answers1

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No, you can not burn in subtitles without transcoding. You must also set a bitrate, or quality option if you want to control the quality.

ffmpeg -i input.mkv -vf subtitles=input.mkv -c:v libx264 -preset slow -crf 22 -c:a copy output.mp4

szatmary
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