: This happens when a file is encoded using a Variable Framerate (VFR). Re-encode the original source file using Constant Framerate (CFR) .
ffmpeg -i input.mkv -filter_complex "[0:v]subtitles=subs.srt:force_style='FontSize=14,FontName=Arial',setpts=PTS-STARTPTS[v]" -map "[v]" -map 0:a -c:v libx264 -preset placebo -crf 15 -c:a copy output.mp4 jur153engsub convert020006 min high quality
When converting media, the following technical pillars determine whether the final product is professional grade: : This happens when a file is encoded