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Médias (1)
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The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
Autres articles (60)
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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 -
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 (...)
Sur d’autres sites (5195)
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Adding transparency to a video from black and white (and gray) alpha information video images
3 juillet 2018, par Jan F.I’d like to create a video with transparency (and semi transparency) in android. The images of the source video are split into two images, the top one with color information (looks like the normal video image), the bottom one with alpha information (the same shapes but only in black and white and gray, black means transparent).
This is the solution for iOS :
https://medium.com/@quentinfasquel/ios-transparent-video-with-coreimage-52cfb2544d54What would be the best way to to this in android ?
Can this be solved with javacv, FFmpegFrameGrabber, FFmpegFrameFilter etc.?
Or better with OpenGL ES and shaders ?
Are there any samples ?
Thanks !
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SVT-AV1 : After encoding the video seeking is very bad in any video player (even HTML5)
18 juin 2020, par Viktor Machniki am using SVT-AV1 and FFMPEG to encode Videos into the AV1 video and opus audio codec (.webm), it works fine, except that the video seeking do not work really (extremly bad). When i seek, the CPU useage jumps up and it takes up to minutes until the seeking process finishes.



Here is how i encode the videos :



- 

- Convert any video into yuv :
ffmpeg -i -preset veryslow -level 6.2 .yuv
- First AV1 run
svt-av1 -i '.yuv' -w -h --fps --rc 0 -q 30 --preset 8 -b '.\output1.ivf' --output-stat-file '.\stat_file.stat' --keyint 1 --enable-restoration-filtering 1
- Second AV1 run
svt-av1 -i '.yuv' -w -h --fps --rc 0 -q 30 --preset 3 -b '.\output.ivf' --input-stat-file '.\stat_file.stat' --keyint 1 --enable-restoration-filtering 1
- Get source video audio in opus codec
ffmpeg -i -c:a libopus -vn -preset veryslow -level 6.2 output.ogg
- Get final .webm video
ffmpeg -i output.ivf -i output.ogg -c copy output.webm













I have allready tryed to play with the —keyin option, also just letting it away and use the encoder default, but the results are always the same. (
--keyin 1
seems to work better than without this option, but also very very bad)


What am i doing wrong ?



Extras : I am using Windows 10 with downloaded version of SVT-AV1 and FFMPEG (I just renamed the SVT-AV1 Encoder .exe file to be
svt-av1.exe
). Used CPU is Ryzen 9 3900X

- Convert any video into yuv :
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AForge.Video.VideoException : Cannot allocate video picture
23 octobre 2015, par user5389242I’m trying to convert images into a video file, but I’m getting the following error :
An unhandled exception of type ’AForge.Video.VideoException’ occurred in AForge.Video.FFMPEG.dll
Additional information : Cannot allocate video picture.
The error occurs on
writer.Open
:writer = new VideoFileWriter();
writer.Open("/output.avi", width, height, 30, VideoCodec.MPEG4, 1000000);