On 2022-01-30 02:11 am, Michael Koch wrote:
Am 29.01.2022 um 20:36 schrieb Michael Koch:
Hello,
is it possible to watch a folder for new images (like
fileSystemWatcher in C#), and if a new image appears, then load it in
FFmpeg? The question is for Windows.
Very large PNG images (about 30 Megapixels) are written to the folder
every 5 seconds. I want to load these images, extract the four
corners, enlarge them by a factor 10, stack the four images together
and show the result on the screen, until the next image appears. The
filtering is no problem, the question is only how to watch the folder
for new images.
I did try to read the same image again and again with this command line:
ffmpeg -loop 1 -i input.png -window_x 0 -window_y 0 -f sdl2 -
I was hoping that I could overwrite the input image by another image,
but that doesn't work. Access denied, because the file is open in FFmpeg.
Use -stream_loop -1 instead of loop. Update the image atomically i.e.
not during a read window.. Best way to update is to create a symlink and
use that as input. Repoint the symlink when the new image file is ready.
Regards,
Gyan
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