ffmpeg: video from images - handling a zero length image file-CodePudding

I have a shell script which uses ffmpeg to crate a time-lapse video from webcam images. Normally, it works just fine:

/usr/bin/ffmpeg -loglevel info  -framerate 4 \
     -pattern_type glob -i $ipath/'*.jpg' \
    -c:v libx264 -crf 30 -y -pix_fmt yuv420p $temp &>>$log

But this chokes if the image is a zero-length file:

-rw-r--r-- 1 pi pi  156636 Sep 29 04:35 image_022.jpg
-rw-r--r-- 1 pi pi  156533 Sep 29 04:35 image_023.jpg
-rw-r--r-- 1 pi pi  159302 Sep 29 04:35 image_024.jpg
-rw-r--r-- 1 pi pi       0 Sep 29 04:35 image_025.jpg
-rw-r--r-- 1 pi pi  157055 Sep 29 04:35 image_026.jpg
-rw-r--r-- 1 pi pi  156851 Sep 29 04:35 image_027.jpg
-rw-r--r-- 1 pi pi  155793 Sep 29 04:35 image_028.jpg
-rw-r--r-- 1 pi pi  160647 Sep 29 04:35 image_029.jpg

In this case the video only included frames up to the zero length JPEG.

I realize I can test the file length of every webcam image, but there must be an easier, more efficient way.

Is there?

CodePudding user response：

FFmpeg will terminate reading an image sequence upon encountering a file with zero size. There's no option to carry on.

Copy over the previous image onto the zero-sized file.