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Les autorisations surchargées par les plugins
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autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
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Sur d’autres sites (8992)
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How can i list all the audio devices on my pc using ffmpeg ? [closed]
12 octobre 2024, par Daniel LipI'm using ffmpeg version : 2024-07-10


I tried this cmd command after running the cmd as admin.


ffmpeg -list_devices true -f dshow -i dummy



but the result is :


D:\>ffmpeg -list_devices true -f dshow -i dummy
ffmpeg version 2024-07-10-git-1a86a7a48d-essentials_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
 built with gcc 13.2.0 (Rev5, 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-libharfbuzz --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --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 59. 28.100 / 59. 28.100
 libavcodec 61. 10.100 / 61. 10.100
 libavformat 61. 5.101 / 61. 5.101
 libavdevice 61. 2.100 / 61. 2.100
 libavfilter 10. 2.102 / 10. 2.102
 libswscale 8. 2.100 / 8. 2.100
 libswresample 5. 2.100 / 5. 2.100
 libpostproc 58. 2.100 / 58. 2.100
[dshow @ 000001c1e700f200] Could not enumerate video devices (or none found).
[dshow @ 000001c1e700f200] Could not enumerate audio only devices (or none found).
[in#0 @ 000001c1e700ee00] Error opening input: Immediate exit requested
Error opening input file dummy.



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ffmpeg minimal linux build with only one filter [closed]
31 juillet 2024, par at8993I am aiming to compile a minimal build of ffmpeg for Ubuntu 22.04. The application requires only the concat filter for .mp4s using H.264 video encoder.


I have followed this guide and used the following commands to include libx264 only :


sudo apt-get update -qq && sudo apt-get -y install \
 autoconf \
 automake \
 build-essential \
 cmake \
 git-core \
 libass-dev \
 libfreetype6-dev \
 libgnutls28-dev \
 libmp3lame-dev \
 libsdl2-dev \
 libtool \
 libva-dev \
 libvdpau-dev \
 libvorbis-dev \
 libxcb1-dev \
 libxcb-shm0-dev \
 libxcb-xfixes0-dev \
 meson \
 ninja-build \
 pkg-config \
 texinfo \
 wget \
 yasm \
 zlib1g-dev

mkdir -p ~/ffmpeg_sources ~/bin

sudo apt-get install libx264-dev



and for the configure command I have used the following options with a view to only enable what's necessary for concat.


cd ~/ffmpeg_sources && \
wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \
tar xjvf ffmpeg-snapshot.tar.bz2 && \
cd ffmpeg && \

PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
 --prefix="$HOME/ffmpeg_build" \
 --pkg-config-flags="--static" \
 --extra-cflags="-I$HOME/ffmpeg_build/include" \
 --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
 --extra-libs="-lpthread -lm" \
 --ld="g++" \
 --bindir="$HOME/bin" \
 --disable-everything \
 --enable-filter=concat \
 --enable-avformat \
 --enable-avdevice \
 --enable-avcodec \
 --enable-decoder=h264 
 --enable-libx264 
 --enable-muxer=mp4 
 --enable-gpl

PATH="$HOME/bin:$PATH" make && \
make install && \
hash -r



However running


ffmpeg -f concat -i files_to_merge.txt -c copy output.mp4



returns error


ffmpeg -f concat -i files_to_merge.txt -c copy output.mp4
ffmpeg version N-116445-gb1d410716b Copyright (c) 2000-2024 the FFmpeg developers
 built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
 configuration: --prefix=/home/user/ffmpeg_build 
--extra-cflags=-I/home/user/ffmpeg_build/include --extra-ldflags=-L/home/user/ffmpeg_build/lib 
--extra-libs='-lpthread -lm' 
--ld=g++ --bindir=/home/user/bin --disable-everything 
--enable-filter=concat --enable-avformat 
--enable-avdevice --enable-avcodec --enable-decoder=h264
 --enable-libx264 --enable-muxer=mp4 
--enable-gpl
 libavutil 59. 30.100 / 59. 30.100
 libavcodec 61. 10.100 / 61. 10.100
 libavformat 61. 5.101 / 61. 5.101
 libavdevice 61. 2.100 / 61. 2.100
 libavfilter 10. 2.102 / 10. 2.102
 libswscale 8. 2.100 / 8. 2.100
 libswresample 5. 2.100 / 5. 2.100
 libpostproc 58. 2.100 / 58. 2.100
[in#0 @ 0x555605fab640] Unknown input format: 'concat'



I assume this is due to the omission of an enable option in the configure command.


Thanks !


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Understanding User Flow : Eight Practical Examples for Better UX
4 octobre 2024, par Daniel Crough — Analytics Tips, UX