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Autres articles (87)
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Gestion des droits de création et d’édition des objets
8 février 2011, parPar défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;
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Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...) -
Dépôt de média et thèmes par FTP
31 mai 2013, parL’outil MédiaSPIP traite aussi les média transférés par la voie FTP. Si vous préférez déposer par cette voie, récupérez les identifiants d’accès vers votre site MédiaSPIP et utilisez votre client FTP favori.
Vous trouverez dès le départ les dossiers suivants dans votre espace FTP : config/ : dossier de configuration du site IMG/ : dossier des média déjà traités et en ligne sur le site local/ : répertoire cache du site web themes/ : les thèmes ou les feuilles de style personnalisées tmp/ : dossier de travail (...)
Sur d’autres sites (10258)
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Video processing to support different web players and qualities [closed]
15 mai 2013, par LinasI am trying to accomplish something similar to youtube player.
The biggest issues I'm facing now is how should I process user uploaded video file.
For example since i want to switch between
240p
,360p
,480p
and720p
I need to convert uploaded video file to 4 different files for each resolution, and because not all browsers can play mp4 i needogg
,mp4
,webm
, so that makes 12 video files, and say if it takes 10 minutes to process 1h video file it would take me about 2h just to process that file which is insane. I know that youtube is ussing cloud servers to process each video file and they have a lot of processing power but I think there some kind of trick to this.So my question is what can i do about this, and how does youtube deal with this ?
My second question is ffmpeg suited for this kind of work, and if so why does this command takes pretty much for ever to finish, I ran this command on a 720p 3minutes long video file and after 15minutes of processing I just canceled the process.
ffmpeg -i hd.webm a.mp4
This one on the other hand took about 7 minutes to finish but it generated 200mb video file out of 25mb file
ffmpeg -i hd.webm -c:v libx264 -preset ultrafast a.mp4
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ffmpeg : stream copy from .mxf into NLE-compatible format
9 juin 2013, par DavidBecause my NLE software does not support the .mxf-files from Canon XF100 I need to convert them into a supported format.
As far as I know, mxf-files are just another container format for mpeg2 streams, so it would be really nice to extract the streams and place them into another container (without reencoding).
I think ffmpeg can do this – correct me if I'm wrong – by running the following command :
ffmpeg -i in.mxf -vcodec copy out.m2ts (or .ts, .mts, ...)
ffmpeg finishes without errors after about 2 seconds (in.mxf is abut 170mb) :
c:\video>c:\ffmpeg\bin\ffmpeg -i in.MXF -vcodec copy out.m2ts
ffmpeg version N-53680-g0ab9362 Copyright (c) 2000-2013 the FFmpeg developers
built on May 30 2013 12:14:03 with gcc 4.7.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
enable-libxvid --enable-zlib
libavutil 52. 34.100 / 52. 34.100
libavcodec 55. 12.102 / 55. 12.102
libavformat 55. 8.100 / 55. 8.100
libavdevice 55. 2.100 / 55. 2.100
libavfilter 3. 73.100 / 3. 73.100
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
Guessed Channel Layout for Input Stream #0.1 : mono
Guessed Channel Layout for Input Stream #0.2 : mono
Input #0, mxf, from 'in.MXF':
Metadata:
uid : 1bb23c97-6205-4800-80a2-e00002244ba7
generation_uid : 1bb23c97-6205-4800-8122-e00002244ba7
company_name : CANON
product_name : XF100
product_version : 1.00
product_uid : 060e2b34-0401-010d-0e15-005658460100
modification_date: 2013-01-06 11:05:02
timecode : 01:42:14:22
Duration: 00:00:28.32, start: 0.000000, bitrate: 51811 kb/s
Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1920x1080 [SAR 1:1 DAR 16:9
], 25 fps, 25 tbr, 25 tbn, 50 tbc
Stream #0:1: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
Stream #0:2: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
Output #0, mpegts, to 'out.m2ts':
Metadata:
uid : 1bb23c97-6205-4800-80a2-e00002244ba7
generation_uid : 1bb23c97-6205-4800-8122-e00002244ba7
company_name : CANON
product_name : XF100
product_version : 1.00
product_uid : 060e2b34-0401-010d-0e15-005658460100
modification_date: 2013-01-06 11:05:02
timecode : 01:42:14:22
encoder : Lavf55.8.100
Stream #0:0: Video: mpeg2video, yuv422p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-3
1, 25 fps, 90k tbn, 25 tbc
Stream #0:1: Audio: mp2, 48000 Hz, mono, s16, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (pcm_s16le -> mp2)
Press [q] to stop, [?] for help
frame= 532 fps=0.0 q=-1.0 size= 143511kB time=00:00:21.25 bitrate=55314.1kbits
frame= 561 fps=435 q=-1.0 size= 151254kB time=00:00:22.42 bitrate=55242.0kbits
frame= 586 fps=314 q=-1.0 size= 158021kB time=00:00:23.41 bitrate=55288.0kbits
frame= 609 fps=255 q=-1.0 size= 164182kB time=00:00:24.34 bitrate=55235.4kbits
frame= 636 fps=217 q=-1.0 size= 171463kB time=00:00:25.42 bitrate=55235.1kbits
frame= 669 fps=194 q=-1.0 size= 180133kB time=00:00:26.72 bitrate=55226.3kbits
frame= 699 fps=173 q=-1.0 size= 188326kB time=00:00:27.92 bitrate=55256.6kbits
frame= 708 fps=169 q=-1.0 Lsize= 190877kB time=00:00:28.30 bitrate=55233.6kbit
s/s
video:172852kB audio:442kB subtitle:0 global headers:0kB muxing overhead 10.1461
18%Unfortunately the output file turns out to be displayed correctly only by vlc player.
My NLE-software (Cyberlink Power Director) is able to open the file but most of the picture is green. Only a few pixels on the left edge show the original video :Any ideas how to solve that problem ? Is there a better way to use .mxf-files in NLE-software without native support ?
thanks in advance
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Audio equalizer using FFmpeg
28 septembre 2015, par Evgeniy KharchenkoI’m developing audio player using FFmpeg. I want to add audio equaliqer to my app, but I don’t know how to do it. I know that FFmpeg has a FFT functions, but I have count of samples that not mutch with any power of 2. I also tried to use other FFT libraries, but I have some noise on my audio after equalization.
Can anybody help me to understand how to use FFmpeg’s FFT functions or any oter ways to implement audio-eq using FFmpeg ?