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Les tâches Cron régulières de la ferme
1er décembre 2010, parLa gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
Le super Cron (gestion_mutu_super_cron)
Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...) -
Contribute to a better visual interface
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Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community. -
Qu’est ce qu’un éditorial
21 juin 2013, parEcrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
Vous pouvez personnaliser le formulaire de création d’un éditorial.
Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...)
Sur d’autres sites (4875)
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How to use libraries ".lib" and ".a" files in GCC
12 novembre 2022, par Blue SkyI have simple C code that uses some functions of
libavcodec
in FFmpeg. I try to compile the code with GCC (on Windows using MinGW) as follows :

gcc -o mycode mycode.c



But I get a lot of errors like "undefined reference to av_free". I know that these functions are defined in the libraries of FFmpeg. I do access files like
avcodec.lib
andlibavcodec.dll.a
, but I don't know how to use them with GCC so that I can compile and make my file. How can I solve this problem ?

-
What is the difference between "location" and "location-eng" metadata of a MP4 file ?
10 décembre 2020, par Weihang JianI am trying to retrieve GPS information from media files using
ffprobe
, for example :

$ ffprobe -v quiet -show_format sample.mp4
[FORMAT]
filename=sample.mp4
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=4.293000
size=11888152
bit_rate=22153556
probe_score=100
TAG:major_brand=mp42
TAG:minor_version=0
TAG:compatible_brands=isommp42
TAG:creation_time=2020-09-20T11:33:49.000000Z
TAG:location=+25.0731+121.3663/
TAG:location-eng=+25.0731+121.3663/
TAG:com.android.version=10
TAG:com.android.manufacturer=Google
TAG:com.android.model=Pixel
[/FORMAT]



We can see that there are 2 tags that look like ISO6709 representations,
location
andlocation-eng
.

And here are my questions :


- 

- What is the difference between
location
andlocation-eng
? It looks like they are always the same. Why do we need 2 different keys with same the value ? - Are
location
andlocation-eng
really in ISO6709 representations ? Is there any specification or standard I can refer to ?






I would really appreciate your help.


- What is the difference between
-
I am getting "Stream specifier ' ' in filtergraph description" in ffmpeg
1er avril 2020, par Dave BI am generating 10 seconds of silence using an image. Here is my command



ffmpeg -loop 1 -framerate 24 -t 10 image.jpg -f lavfi -t 10 -i anullsrc -filter_complex "[0][1]concat=n=2:v=1:a=1" out.mp4




Also, I have tried



ffmpeg -loop 1 -framerate 24 -t 10 beach.jpg -f lavfi -t 10 -i anullsrc -filter_complex "[0:v][1:a]concat=n=2:v=1:a=1" out.mp4




I am getting following errors



ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
 built with Apple clang version 11.0.0 (clang-1100.0.33.17)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
 libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
Input #0, lavfi, from 'anullsrc':
 Duration: N/A, start: 0.000000, bitrate: 705 kb/s
 Stream #0:0: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s
Stream specifier '' in filtergraph description [0][1]concat=n=2:v=1:a=1 matches no streams.

ffmpeg -loop 1 -framerate 24 -t 10 beach.jpg -f lavfi -t 10 -i anullsrc -filter_complex "[0:v][1:a]concat=n=2:v=1:a=1" out.mp4
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
 built with Apple clang version 11.0.0 (clang-1100.0.33.17)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
 libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
Input #0, lavfi, from 'anullsrc':
 Duration: N/A, start: 0.000000, bitrate: 705 kb/s
 Stream #0:0: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s
Stream specifier ':v' in filtergraph description [0:v][1:a]concat=n=2:v=1:a=1 matches no streams.