What does EOI missing mean for mjpeg?

Question

When encoding I sometimes see this ffmpeg warning

[mjpeg @ 0x5584bda90320] EOI missing, emulating

Already have googled but couldn't find anything useful. What does EOI stand for and what can cause this?

Here an example of the full command used:

ffmpeg -f image2 -thread_queue_size 3072 -framerate 15.9 -i /var/www/videomail/production/source/var/production/tmp/clients/videomail.io/11e
7-bd8d-9a4e4a70-86c9-13af52a474c3/frames/%d.jpg -y -an -vcodec libx264 -filter:v drawtext=fontfile=/var/www/videomail/production/source/src/assets/fonts/Varela-Regular.ttf:text
=www.videomail.io:fontsize=12:[email protected]:x=text_h:y=main_h-(text_h*2):[email protected]:shadowx=1:shadowy=1,scale=trunc(iw/2)*2:trunc(ih/2)*2 -crf 23 -pix_f
mt yuv420p -preset ultrafast -profile:v baseline -level:v 3.1 -movflags +faststart -loglevel warning /var/www/videomail/production/source/var/production/tmp/clients/videomail.i
o/11e7-bd8d-9a4e4a70-86c9-13af52a474c3/videomail_preview.mp4

Here a report when it occurs: https://gist.github.com/binarykitchen/d8643bf0c0fb18f1b41cab7a322deb91

Answer 1

Some of your input files are slightly corrupted. Most JPEG viewers don't even warn you if the End Of Image marker is missing.