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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 -
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 (...) -
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 (...)
Sur d’autres sites (10294)
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FFmpeg Audio DPLII + Volume normalization seems failing
10 avril 2017, par vit123Kind FFMpeg experts,
I’m using the last FFmpeg version 3.2.4, my target is to normalize the DPLII output from a multichannel (e.g. DTS-HD) stream, by just the following two FFMpeg commands :
1)
ffmpeg -i myInput.dtshd -af "aresample=matrix_encoding=dplii:ocl=downmix,volumedetect" -f null NUL
so detecting for example : "max_volume : -6.2 dB"
then :2)
ffmpeg -i myInput.dtshd -af "aresample=matrix_encoding=dplii:ocl=downmix,volume=6.199dB" myOutput.wav
The big problem is that the WAV output I get is severely clipped and completely different from what I get issuing the following 2 separated commands after the (same) 1st one :
2a)
ffmpeg -i myInput.dtshd -af "aresample=matrix_encoding=dplii:ocl=downmix" myOutputLowVol.wav
2b)
ffmpeg -i myOutputLowVol.wav -af "volume=6.199dB" theCorrectOutput.wav
Now the big question is : shouldn’t be the command 2) exactly equivalent to commands 2a) + 2b) ?
Whyever I get 2 very different results : in the 1st case I get an "over-volumed" audio, in the 2nd case I get a perfectly normalized audio ?Am I missing anything ? is this a bug ?
Thanks a lot for your help !Vittorio
P.S.
please note that issuing a "volumedetect" on "myOutputLowVol.wav", I get just the same "max_volume" resulting from 1), as expected, so the problem seems being all on command 2) -
too long video trace file volume ?
12 juin 2021, par davidI have produced an XML trace file of a 20-sec video and the volume of this trace file is 8.57 Gigabyte !! the videos is encoded using this command :


ffmpeg -i input_1080p60.mp4 -c:v libx264 -pix_fmt yuv420p -b:v 8000K -bufsize 8000K -minrate 8000K -maxrate 8000K -x264opts keyint=120:min-keyint=120 -preset veryfast -profile:v high out_1080p.mp4



then I used the following command I changed the format in .264 because the input of JM software for producing an XML trace file is .264 :


ffmpeg -i out_1080p.mp4 -c:v libx264 -pix_fmt yuv420p -b:v 8000K -bufsize 8000K -minrate 8000K -maxrate 8000K -x264opts keyint=120:min-keyint=120 -preset veryfast -profile:v high out_1080p.264



after using JM using the following code :


ldecod.exe -i E:\software\out_1080p.264 -o E:\software\out.yuv -xmltrace out_1080p_xml.xml



it is really weird for me. because I have more than 1000 videos that I need to produce their trace files and I do not know what should I do with this size of the trace file. furthermore, I can not open a file with this volume and no software can open the file !! :((. could you please tell me what is the problem ? and how can I solve it ? do you know another way to produce this trace file ?
THanks


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lavfi/volume : fix NULL reference in filter_frame()
25 décembre 2013, par Stefano Sabatini