#9744: blend=grainextract doesn't work
-------------------------------------+-------------------------------------
Reporter: Michael | Type: defect
Koch |
Status: new | Priority: normal
Component: avfilter | Version: git-
| master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
blend=grainextract should calculate the difference between two frames and
shift the result to middle gray. If both frames are identical, the result
should be uniform middle gray. But it isn't.
ffmpeg -f lavfi -i testsrc2 -lavfi split,blend=grainextract -frames 1 -y
out.png
ffmpeg version 2022-04-18-git-d5687236ab-full_build-www.gyan.dev Copyright
(c) 2000-2022 the FFmpeg developers
built with gcc 11.2.0 (Rev10, 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-libsnappy --enable-zlib --enable-librist --enable-libsrt
--enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
--enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libdavs2
--enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2
--enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx
--enable-mediafoundation --enable-libass --enable-frei0r --enable-
libfreetype --enable-libfribidi --enable-liblensfun --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-libshaderc --enable-vulkan
--enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme
--enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb
--enable-libmp3lame --enable-libshine --enable-libtheora --enable-
libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm
--enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-
libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-
libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 57. 24.101 / 57. 24.101
libavcodec 59. 26.100 / 59. 26.100
libavformat 59. 22.100 / 59. 22.100
libavdevice 59. 6.100 / 59. 6.100
libavfilter 8. 33.100 / 8. 33.100
libswscale 6. 6.100 / 6. 6.100
libswresample 4. 6.100 / 4. 6.100
libpostproc 56. 5.100 / 56. 5.100
Input #0, lavfi, from 'testsrc2':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR
1:1 DAR 4:3], 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 (rawvideo) -> split:default
blend:default -> Stream #0:0 (png)
Press [q] to stop, [?] for help
Output #0, image2, to 'out.png':
Metadata:
encoder : Lavf59.22.100
Stream #0:0: Video: png, rgb24(pc, gbr/unknown/unknown, progressive),
320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn
Metadata:
encoder : Lavc59.26.100 png
frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
speed=4.33x
video:4kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9744>
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