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  • What are you trying to do... -framerate 2? What's the goal?
    – JayCravens
    Commented Jun 10 at 22:26
  • I got this command line: ffmpeg -loop 1 -framerate 2 -i input.png -i audio.m4a -c:v libx264 -preset medium -tune stillimage -crf 18 -c:a copy -shortest -pix_fmt yuv420p output.mkv from ffmpeg website to use the best still image compatible to YouTube it’s mkv but is there one for .webm best compatible with YouTube? Any ffmpeg webm YouTube specific settings command. Please help. I hope you understand?
    – Michael
    Commented Jun 10 at 22:40
  • Well, those settings are fine for .webm Try: ffmpeg -i input.png -i audio.m4a -loop 1 -vf "format=yuv420p" -c:v h264 -crf 18 -c:a copy -avoid_negative_ts auto -shortest -movflags +faststart output.webm
    – JayCravens
    Commented Jun 10 at 23:18
  • Thank You. You have answered my question.
    – Michael
    Commented Jun 10 at 23:22