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SPIP - plugins - embed code - Exemple
2 septembre 2013, par
Mis à jour : Septembre 2013
Langue : français
Type : Image
Autres articles (53)
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Participer à sa traduction
10 avril 2011Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
Actuellement MediaSPIP n’est disponible qu’en français et (...) -
Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir
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How to encode KLV stream into MPEGTS with FFMPEG ?
27 février 2018, par gediminasguI’m playing with muxing h264 video with KLV data into mpegts to make video with included KLV data like in ffmpeg samples http://samples.ffmpeg.org/MPEG2/mpegts-klv/Day%20Flight.mpg
My command line :
ffmpeg.exe -re -f lavfi -i testsrc=rate=30 -re -f data -i out_day.klv -map 0:0 -map 1:0 -c:v h264 -c:d klv -f mpegts test.ts
It creates video, but data is encoded with bin_data code, but not klv :
> ffmpeg.exe -i test.ts
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
[mpegts @ 0000017fad6124a0] start time for stream 1 is not set in estimate_timings_from_pts
Input #0, mpegts, from 'test.ts':
Duration: 00:00:04.93, start: 1.466667, bitrate: 78 kb/s
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: h264 (High 4:4:4 Predictive) ([27][0][0][0] / 0x001B), yuv444p(progressive), 320x240 [SAR 1:1 DAR 4:3], 30 fps, 30 tbr, 90k tbn, 60 tbc
Stream #0:1[0x101]: Data: bin_data ([6][0][0][0] / 0x0006)
At least one output file must be specifiedHow to set data stream codec to KLV ?
p.s.
out_day.klv
is extracted fromDay Flight.mpg
with commandffmpeg -i "Day Flight.mpg" -map data-re -codec copy -f data out_day.klv
Thank you
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How can I retain 2x pixel density when encoding Retina screen capture with ffmpeg ?
26 février 2018, par hfossliWhenever I use ffmpeg to encode a HiDPI/Retina screen recording, the video plays at 2x the size, so it looks fuzzy, because the pixel density is not retained.
How can I retain the original pixel density of HiDPI screen recordings with ffmpeg ?
How to reproduce :
- Use QuickTime Player to create a Screen Recording on a Retina Mac.
- Play the video you recorded in QuickTime Player using the
⌘1 Actual Size
view. Notice that it’s playing 2:1 on your Retina Display, so the video looks sharp. It’s playing in half the space of the actual recorded pixels. -
Use ffmpeg to encode the video using a command like this :
ffmpeg -i haha.mov -c:v libx264 -crf 23 haha-lg.mov
- Play the new ffmpeg-compressed video in QuickTime Player using the
⌘1 Actual Size
view. Notice that it’s playing 1:1, so the video looks fuzzy.
To clarify, the video does not look blurry because it was compressed. Rather, it looks blurry because the video is being played twice as big as it should be, at a 1:1 pixel density, instead of the required 2:1 pixel density, presumably because some metadata is being discarded when encoding.
For the record, VLC plays both videos too big (blurry). So being able to play HiDPI videos seems to be a feature of QuickTime Player.
Here is the detailed information ffmpeg shows for the original screen recording :
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'haha.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2018-02-26T16:46:00.000000Z
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iMac18,3
com.apple.quicktime.software: Mac OS X 10.13.3 (17D102)
com.apple.quicktime.creationdate: 2018-02-26T10:45:50-0600
Duration: 00:00:04.35, start: 0.000000, bitrate: 10947 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1396x928 [SAR 1:1 DAR 349:232], 10701 kb/s, 60 fps, 60 tbr, 6k tbn, 12k tbc (default)
Metadata:
creation_time : 2018-02-26T16:46:00.000000Z
handler_name : Core Media Data Handler
encoder : H.264And here is the information for the ffmpeg-compressed version :
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'haha-lg.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf57.83.100
Duration: 00:00:04.35, start: 0.000000, bitrate: 1923 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1396x928 [SAR 1:1 DAR 349:232], 1783 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : DataHandler
encoder : Lavc57.107.100 libx264