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Autres articles (17)
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Emballe Médias : Mettre en ligne simplement des documents
29 octobre 2010, parLe plugin emballe médias a été développé principalement pour la distribution mediaSPIP mais est également utilisé dans d’autres projets proches comme géodiversité par exemple. Plugins nécessaires et compatibles
Pour fonctionner ce plugin nécessite que d’autres plugins soient installés : CFG Saisies SPIP Bonux Diogène swfupload jqueryui
D’autres plugins peuvent être utilisés en complément afin d’améliorer ses capacités : Ancres douces Légendes photo_infos spipmotion (...) -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...) -
Gestion générale des documents
13 mai 2011, parMédiaSPIP ne modifie jamais le document original mis en ligne.
Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...)
Sur d’autres sites (6268)
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how ffmpeg preserves alpha channel
16 septembre 2017, par LiJianixnWe know
ffmpeg
can help us with overlaying image on video.My target is to wrap a video with an image whose background istransparent
.ffmpeg -i device/nexus5_portrait.png -i device/input.mp4\
-filter_complex "overlay=(W-w)/2:(H-h)/2:enable='between(t,0,5)'"\
-b:v 16M -bufsize 16M device/output.mp4;Output.mp4 has a black background so is there any way to preserve
alpha
channel ?Thanks in advance !
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FFmpeg audio channel rematrix (5.1 to stereo)
29 octobre 2014, par Flock DawsonI’ve got a (very large !) Apple ProRes 422 file with 16ch audio. To be able to use it on a less powerful computer, I’d like to convert it to a standard MP4 file (h264 video codec, stereo audio). The original file has 16 channels of audio, however, and FFmpeg gives an error when I try to convert it (’Rematrix is needed’). How do I do rematrixing of audio channels ? Are there additional steps needed ?
This is the FFmpeg command I used :
ffmpeg -y -i Capture0000.mov -vcodec libx264 -vb 2000k -pix_fmt yuv420p -coder 0 -profile:v baseline -acodec libfaac -ab 128k /tmp/out.mp4
This is the FFmpeg output :
ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
built on May 8 2014 14:17:45 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration: --prefix=/usr/local/ffmpeg_build --extra-cflags=-I/usr/local/ffmpeg_build/include --extra-ldflags=-L/usr/local/ffmpeg_build/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab --enable-libxvid --enable-libfaac
libavutil 52. 81.100 / 52. 81.100
libavcodec 55. 60.103 / 55. 60.103
libavformat 55. 37.102 / 55. 37.102
libavdevice 55. 13.101 / 55. 13.101
libavfilter 4. 5.100 / 4. 5.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Capture0000.mov':
Metadata:
creation_time : 2014-08-17 18:30:31
Duration: 01:01:22.52, start: 0.000000, bitrate: 202001 kb/s
Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 1920x1080, 183513 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
Metadata:
creation_time : 2014-08-17 18:30:31
handler_name : Apple Alias Data Handler
encoder : Apple ProRes 422 (HQ)
Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 16 channels, s32, 18432 kb/s (default)
Metadata:
creation_time : 2014-08-17 18:30:31
handler_name : Apple Alias Data Handler
[auto-inserted resampler 0 @ 0x3943da0] [SWR @ 0x39441a0] Rematrix is needed between 16 channels and 5.1 but there is not enough information to do it
[auto-inserted resampler 0 @ 0x3943da0] Failed to configure output pad on auto-inserted resampler 0
Error opening filters!This is the FFprobe output :
ffprobe version 2.2.git Copyright (c) 2007-2014 the FFmpeg developers
built on May 8 2014 14:17:45 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration: --prefix=/usr/local/ffmpeg_build --extra-cflags=-I/usr/local/ffmpeg_build/include --extra-ldflags=-L/usr/local/ffmpeg_build/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab --enable-libxvid --enable-libfaac
libavutil 52. 81.100 / 52. 81.100
libavcodec 55. 60.103 / 55. 60.103
libavformat 55. 37.102 / 55. 37.102
libavdevice 55. 13.101 / 55. 13.101
libavfilter 4. 5.100 / 4. 5.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Capture0000.mov':
Metadata:
creation_time : 2014-08-17 18:30:31
Duration: 01:01:22.52, start: 0.000000, bitrate: 202001 kb/s
Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 1920x1080, 183513 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
Metadata:
creation_time : 2014-08-17 18:30:31
handler_name : Apple Alias Data Handler
encoder : Apple ProRes 422 (HQ)
Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 16 channels, s32, 18432 kb/s (default)
Metadata:
creation_time : 2014-08-17 18:30:31
handler_name : Apple Alias Data Handler -
how ffmpeg preserves alpa channel
11 septembre 2017, par LiJianixnWe know
ffmpeg
can help us with overlaying image on video.My target is to wrap a video with an image whose background istransparent
.ffmpeg -i device/nexus5_portrait.png -i device/input.mp4\
-filter_complex "overlay=(W-w)/2:(H-h)/2:enable='between(t,0,5)'"\
-b:v 16M -bufsize 16M device/output.mp4;Output.mp4 has a black background so is there any way to preserve
alpha
channel ?Thanks in advance !