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Médias (1)
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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
Autres articles (56)
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Support audio et vidéo HTML5
10 avril 2011MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...) -
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 (...) -
De l’upload à la vidéo finale [version standalone]
31 janvier 2010, parLe chemin d’un document audio ou vidéo dans SPIPMotion est divisé en trois étapes distinctes.
Upload et récupération d’informations de la vidéo source
Dans un premier temps, il est nécessaire de créer un article SPIP et de lui joindre le document vidéo "source".
Au moment où ce document est joint à l’article, deux actions supplémentaires au comportement normal sont exécutées : La récupération des informations techniques des flux audio et video du fichier ; La génération d’une vignette : extraction d’une (...)
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Matomo Celebrates 15 Years of Building an Open-Source & Transparent Web Analytics Solution
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Using FFMPEG with PHP via shell_exec
23 février 2018, par Peter FriedlanderTrying to scan a directory fill of MPEG files and make framegrabs out of them using PHP.
$e= shell_exec('find . -regex ".*\.\(mp4\)" -exec bash -c \'/home3/tcokchal/public_html/ffmpeg3/ffmpeg-git-20180222-64bit-static/ffmpeg -i {} -vf fps=1/8 \{}Frame55Grab%d.png\' - {} \; 2>&1 ' );
This only returns
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Im trying to automate the process of a local shell script
find . -regex ".*\.\(mp4\)" -exec ffmpeg -i {} -vf fps=1/8 {}Frame55Grab%d.png \;
Which works
Output
ffmpeg version N-45152-ga246701e9-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libfribidi --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
libavutil 56. 7.101 / 56. 7.101
libavcodec 58. 12.102 / 58. 12.102
libavformat 58. 9.100 / 58. 9.100
libavdevice 58. 2.100 / 58. 2.100
libavfilter 7. 12.100 / 7. 12.100
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './1576498169060935.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.40.101
Duration: 00:00:29.46, start: 0.000000, bitrate: 590 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 360x640, 516 kb/s, 29.93 fps, 30 tbr, 90k tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 64 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> png (native))
Press [q] to stop, [?] for help
[png @ 0x55ed2c0] ff_frame_thread_encoder_init failed
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!
Done. -
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