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You can try adding the original_size filter option, such as: -vf "ass=test_subs.ass:original_size=768x576" Specify the size of the original video, the video for which the ASS file was composed. For the syntax of this option, check the Video size section in the ffmpeg-utils manual. Due to a misdesign in ASS aspect ratio arithmetic, this is ...


I found some ASS files, like this sample, which contain a Video Aspect Ratio tag but it seems to not make a difference in ffmpeg hardcoding. The workaround I can think of right now is to create a complex filter where you create a transparent RGBA canvas of 1024x576; burn the subtitles onto them, scale the result to 768x576 or 720x576, depending on your ...

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