The FFmpeg Image2 demuxer looks for files starting at number 0001, so if the lowest image number is something other than 1 you should try something like (to start from the 55th image):
Code:
ffmpeg -start_number 55 -i DSC_%04d.JPG -vcodec mpeg4 timelapse.mp4
## or
ffmpeg -f image2 -start_number 55 -i DSC_%04d.JPG -vcodec mpeg4 timelapse.mp4
If there are gaps in the numbering, this may not work, so you should try:
Code:
ffmpeg -f image2 -pattern_type glob -i 'DSC_*.JPG' -vcodec mpeg4 timelapse.mp4
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