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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (30)
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Pas question de marché, de cloud etc...
10 avril 2011Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
sur le web 2.0 et dans les entreprises qui en vivent.
Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...) -
Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...) -
Le plugin : Podcasts.
14 juillet 2010, parLe problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
Types de fichiers supportés dans les flux
Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)
Sur d’autres sites (4832)
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Use nvidia hardware acceleration to merge webms with pngs in ffmpeg
2 février, par Joshi234So I need to merge around 18000 webms with with pngs, however on software encoding it's really slow, so I'm trying to use hardware acceleration to make this faster.


I tried a lot of different stuff but none of them seems to work and it gives me generic errors to what I couldn't find anything relavant.


This is the most "succesful" try I had :

ffmpeg -hwaccel cuvid -c:v vp9_cuvid -i lightray.webm -i card.png -filter_complex "[1]format=argb,colorchannelmixer=aa=0.35[ol];[0][ol]overlay" -colorspace 5 -c:a copy output.webm

Which gives me this error :


ffmpeg version n7.0.1-ffmpeg-windows-build-helpers Copyright (c) 2000-2024 the FFmpeg developers
 built with gcc 10.2.0 (GCC)
 configuration: --pkg-config=pkg-config --pkg-config-flags=--static --extra-version=ffmpeg-windows-build-helpers --enable-version3 --disable-debug --disable-w32threads --arch=x86_64 --target-os=mingw32 --cross-prefix=/home/runner/work/ffmpeg-stable-autobuild/ffmpeg-stable-autobuild/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32- --enable-libcaca --enable-gray --enable-libtesseract --enable-fontconfig --enable-gmp --enable-libass --enable-libbluray --enable-libbs2b --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libvorbis --enable-libwebp --enable-libzimg --enable-libzvbi --enable-libmysofa --enable-libopenjpeg --enable-libopenh264 --enable-libvmaf --enable-libsrt --enable-libxml2 --enable-opengl --enable-libdav1d --enable-gnutls --enable-libsvtav1 --enable-libvpx --enable-libaom --enable-nvenc --enable-nvdec --extra-libs=-lz --extra-libs=-lpng --extra-libs=-lm --extra-libs=-lfreetype --extra-libs=-lshlwapi --extra-libs=-lmpg123 --extra-libs=-lpthread --extra-cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCACA_STATIC --enable-amf --enable-libmfx --enable-libaribcaption --enable-gpl --enable-frei0r --enable-librubberband --enable-libvidstab --enable-libx264 --enable-libx265 --enable-avisynth --enable-libaribb24 --enable-libxvid --enable-libdavs2 --enable-libxavs2 --enable-libxavs --extra-cflags='-mtune=generic' --extra-cflags=-O3 --enable-static --disable-shared --prefix=/home/runner/work/ffmpeg-stable-autobuild/ffmpeg-stable-autobuild/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32 --enable-nonfree --enable-libfdk-aac --enable-decklink
 libavutil 59. 8.100 / 59. 8.100
 libavcodec 61. 3.100 / 61. 3.100
 libavformat 61. 1.100 / 61. 1.100
 libavdevice 61. 1.100 / 61. 1.100
 libavfilter 10. 1.100 / 10. 1.100
 libswscale 8. 1.100 / 8. 1.100
 libswresample 5. 1.100 / 5. 1.100
 libpostproc 58. 1.100 / 58. 1.100
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 3 times
[vp9 @ 000001baa2891400] Not all references are available
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 1 times
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 4 times
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 3 times
[vp9 @ 000001baa2891400] Not all references are available
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 12 times
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 4 times
[vp9 @ 000001baa2891400] Not all references are available
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 1 times
[vp9 @ 000001baa2891400] Not all references are available
 Last message repeated 1 times
[vp9 @ 000001baa2891400] Invalid frame marker
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 1 times
[vp9 @ 000001baa2891400] Requested reference 6 not available
[vp9 @ 000001baa2891400] Invalid frame marker
 Last message repeated 1 times
[vp9 @ 000001baa2891400] Not all references are available


I'm by no means an expert in ffmpeg or in video encoding in general, so I have no idea what this is supposed to mean.


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FFmpeg av_dump_format showing incorrect output, but ffprobe displays correct metadata
29 janvier, par グルグルI use ffmpeg 7.1 source build on windows and compilation configuration as follow :


configuration:
 --toolchain=msvc
 --arch=x86_64
 --enable-x86asm
 --enable-asm
 --enable-shared
 --enable-w32threads
 --prefix=/D/build


When I use
av_dump_formatto print metadata of test.mp3, it display the incorrect information.

extern "C"
{
#include <libavformat></libavformat>avformat.h>
}

int main()
{ 
 av_log_set_level(AV_LOG_DEBUG);

 auto url = "D:/music/test.mp3";

 AVFormatContext* fmt;
 auto ret = avformat_open_input(&fmt, url, nullptr, nullptr);
 if (ret < 0)
 {
 av_log(nullptr, AV_LOG_ERROR, "Cannot open %s format : %s", url, av_err2str(ret));
 exit(EXIT_FAILURE);
 }

 av_dump_format(fmt, 0, url, 0);
}


output


[AVFormatContext @ 000001768E65BC40] Opening 'D:/music/test.mp3' for reading
[file @ 000001768E65C180] Setting default whitelist 'file,crypto,data'
[mp3 @ 000001768E65BC40] Format mp3 probed with size=4096 and score=51
id3v2 ver:4 flags:00 len:35
[mp3 @ 000001768E65BC40] pad 576 576
[mp3 @ 000001768E65BC40] Skipping 0 bytes of junk at 462.
Input #0, mp3, from 'D:/music/test.mp3':
 Metadata:
 encoder : Lavf58.76.100
 Duration: N/A, bitrate: N/A
 Stream #0:0, 0, 1/14112000: Audio: mp3, 0 channels
 Metadata:
 encoder : Lavc58.13


You can see the Stream info is useless.


But I use ffprobe which is built with same configuration to print metadata of test.mp3.


It's display normal.


ffprobe version 7.0.1 Copyright (c) 2007-2024 the FFmpeg developers
 built with Microsoft (R) C/C++ Optimizing Compiler Version 19.41.34123 for x64
 configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --prefix=/D/build
 WARNING: library configuration mismatch
 avutil configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
 avcodec configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
 avformat configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
 avdevice configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
 avfilter configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
 swscale configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
 swresample configuration: --toolchain=msvc --arch=x86_64 --enable-x86asm --enable-asm --enable-shared --enable-w32threads --disable-programs --disable-doc --disable-static --prefix=/D/build
 libavutil 59. 8.100 / 59. 39.100
 libavcodec 61. 3.100 / 61. 19.100
 libavformat 61. 1.100 / 61. 7.100
 libavdevice 61. 1.100 / 61. 3.100
 libavfilter 10. 1.100 / 10. 4.100
 libswscale 8. 1.100 / 8. 3.100
 libswresample 5. 1.100 / 5. 3.100
Input #0, mp3, from 'D:\music\test.mp3':
 Metadata:
 encoder : Lavf58.76.100
 Duration: 00:05:00.12, start: 0.025057, bitrate: 128 kb/s
 Stream #0:0: Audio: mp3 (mp3float), 44100 Hz, stereo, fltp, 128 kb/s
 Metadata:
 encoder : Lavc58.13


Why is
av_dump_formatnot correctly showing stream information ? How can I fix it ?

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OpenCV on MacOS : Match Camera Index and Name
15 janvier, par rpi_guruI have a builtin camera and a USB webcam connected to my MacOS.


Here is a result of
system_profiler SPCameraDataType -xmlcommand :

<?xml version="1.0" encoding="UTF-8"?>

<plist version="1.0">
<array>
 <dict>
 <key>_SPCommandLineArguments</key>
 <array>
 <string>/usr/sbin/system_profiler</string>
 <string>-nospawn</string>
 <string>-xml</string>
 <string>SPCameraDataType</string>
 <string>-detailLevel</string>
 <string>full</string>
 </array>
 <key>_SPCompletionInterval</key>
 <real>1.1997909545898438</real>
 <key>_SPResponseTime</key>
 <real>1.2810090780258179</real>
 <key>_dataType</key>
 <string>SPCameraDataType</string>
 <key>_detailLevel</key>
 <integer>-1</integer>
 <key>_items</key>
 <array>
 <dict>
 <key>_name</key>
 <string>USB Camera</string>
 <key>spcamera_model-id</key>
 <string>UVC Camera VendorID_3141 ProductID_25453</string>
 <key>spcamera_unique-id</key>
 <string>0x11000000c45636d</string>
 </dict>
 <dict>
 <key>_name</key>
 <string>FaceTime HD Camera</string>
 <key>spcamera_model-id</key>
 <string>FaceTime HD Camera</string>
 <key>spcamera_unique-id</key>
 <string>EAB7A68F-EC2B-4487-AADF-D8A91C1CB782</string>
 </dict>
 </array>
 <key>_parentDataType</key>
 <string>SPHardwareDataType</string>
 <key>_properties</key>
 <dict>
 <key>_name</key>
 <dict>
 <key>_isColumn</key>
 <string>NO</string>
 <key>_isOutlineColumn</key>
 <string>NO</string>
 <key>_order</key>
 <string>0</string>
 </dict>
 <key>spcamera</key>
 <dict>
 <key>_order</key>
 <string>10</string>
 </dict>
 <key>spcamera_model-id</key>
 <dict>
 <key>_order</key>
 <string>30</string>
 </dict>
 <key>spcamera_unique-id</key>
 <dict>
 <key>_order</key>
 <string>40</string>
 </dict>
 <key>volumes</key>
 <dict>
 <key>_detailLevel</key>
 <string>0</string>
 </dict>
 </dict>
 <key>_timeStamp</key>
 <date>2024-11-29T21:57:28Z</date>
 <key>_versionInfo</key>
 <dict>
 <key>com.apple.SystemProfiler.SPCameraReporter</key>
 <string>1.2.0</string>
 </dict>
 </dict>
</array>
</plist>


As you can see, I have a couple of video input devices :
USB Camera&FaceTime HD Camera

The problem is that when I use
cap = cv2.VideoCapture(0), it uses theFaceTime HD Camera.

Can we match the camera index in OpenCV with the camera names ?


P.S. I tried
ffmpeg, but it returned similar result :



ioreg | grep -i camresult :



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