[FFmpeg-user] How to create good video from low quality jpeg

[Kawada Tsuyoshi]

Hi ffmpeg users.

I want to know how to create good video from low quality jpeg files.

I executed this command.

$ ffmpeg -r 30 -i %03d.jpg -vcodec libx264 -pix_fmt yuv420p -r 30 out.mp4

result
this is good.
https://mekou.com/ok.jpg
https://mekou.com/out.ok.mp4

this is not good.
https://mekou.com/ng.jpg
https://mekou.com/out.ng.mp4

I know ng.jpg files are low quality jpeg.
But out.ng.mp4 is terrible video file.

Could you tell me other good  way or ffmpeg options.

Thanks,
Tsuyoshi