Am 30.01.2022 um 05:28 schrieb Gyan Doshi:
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.
I did create a symlink which is pointing to a PNG image. When I double
click on the symlink, the image is shown.
But something must be wrong in my FFmpeg command line.
ffmpeg -framerate 1 -stream_loop -1 -i symlink.lnk -window_x 0 -window_y
0 -f sdl2 -
I get this error message:
symlink.lnk: Invalid data found when processing input
The console output is below.
Michael
C:\Users\astro\Desktop\reload>ffmpeg -framerate 1 -stream_loop -1 -i
symlink.lnk -window_x 0 -window_y 0 -f sdl2 -
ffmpeg version 2022-01-24-git-0a83ecbf48-essentials_build-www.gyan.dev
Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 11.2.0 (Rev7, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static
--disable-w32threads --disable-autodetect --enable-fontconfig
--enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp
--enable-bzlib --enable-lzma --enable-zlib --enable-libsrt
--enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid
--enable-libaom --enable-libopenjpeg --enable-libvpx
--enable-mediafoundation --enable-libass --enable-libfreetype
--enable-libfribidi --enable-libvidstab --enable-libvmaf
--enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid
--enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va
--enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt
--enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora
--enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb
--enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
libavutil 57. 18.100 / 57. 18.100
libavcodec 59. 20.100 / 59. 20.100
libavformat 59. 17.101 / 59. 17.101
libavdevice 59. 5.100 / 59. 5.100
libavfilter 8. 26.101 / 8. 26.101
libswscale 6. 5.100 / 6. 5.100
libswresample 4. 4.100 / 4. 4.100
libpostproc 56. 4.100 / 56. 4.100
symlink.lnk: Invalid data found when processing input
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