convert from jpg to mp4 by ffmpeg

Depending on your file names you'll want:

ffmpeg -f image2 -i /path/to/file/image%3d.jpg test.avi

The image%3d would be for files named: image000.jpg, image001.jpg, image002.jpg, etc.

If your files are named image0.jpg, image1.jpg, image2.jpg, etc. then you'd use /path/to/file/image%d.jpg.

See FFmpeg image2 demuxer examples

I can show you an example here,

ffmpeg -f image2 -r 60 -i path/filename%03d.jpg -vcodec libx264 -crf 18  -pix_fmt yuv420p test.mp4

f: force format
r: frame rate
i: input files assuming your files are filename001.jpg, filename002.jpg, ...
vcodec: video codec
crf: constant rate factor (0-51). 17-18 is (nearly) visually lossless. See Encode/H.264
pix_fmt: pixel format

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