On 02/08/2021 08:24 PM, Carl Zwanzig wrote:
On 2/8/2021 5:10 PM, Mark Filipak (ffmpeg) wrote:
I want to insert black frames into a stream on a regular basis.
#1, Is that an input device? I think so. Or,
I think what you want is based on "-f lavfi color=c=black" although it will depend on whether you
want to insert the black frame between existing frames or on top of one of them (whether to just
periodically overlay or to create segments).
That's what I was just looking at.
As a 1st step to get a source (based on the pink example in the docs), I tried
this:
C:\AVOut\THE LAST EMPEROR>ffmpeg -f lavfi -graph "color=c=pink [out0]" test.mkv
ffmpeg started on 2021-02-08 at 20:21:13
Report written to "ffmpeg-20210208-202113.log"
Log level: 32
ffmpeg version N-100851-g9f38fac053 Copyright (c) 2000-2021 the FFmpeg
developers
built with gcc 9.3-win32 (GCC) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config
--cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3
--disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2
--enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig
--enable-opencl --enable-libvmaf --enable-vulkan --enable-libvorbis --enable-amf --enable-libaom
--enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm
--enable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus
--enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband
--enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1
--enable-libtwolame --enable-libuavs3d --enable-libvidstab --enable-libx264 --enable-libx265
--enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC
--extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil 56. 64.100 / 56. 64.100
libavcodec 58.119.100 / 58.119.100
libavformat 58. 65.101 / 58. 65.101
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7.100.100 / 7.100.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
[NULL @ 0000016b7a3a9000] Requested output format 'lavfi' is not a suitable
output format
test.mkv: Invalid argument
see also
https://ffmpeg.org/ffmpeg-filters.html#allrgb_002c-allyuv_002c-color_002c-haldclutsrc_002c-nullsrc_002c-pal75bars_002c-pal100bars_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc
I'll take a look at it. Thanks, Carl!
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