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Autres articles (22)
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Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
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Les formats acceptés
28 janvier 2010, parLes commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
ffmpeg -codecs ffmpeg -formats
Les format videos acceptés en entrée
Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
Les formats vidéos de sortie possibles
Dans un premier temps on (...) -
Les vidéos
21 avril 2011, parComme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)
Sur d’autres sites (2660)
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Does H.264 standard allow separate luma and chroma QP control in Baseline Profile ?
28 août 2013, par Bhaskar DeyAlthough the wikipedia article states that separate luma and chroma QP (quantization parameter) is only supported in High profiles, I didn't find any supporting reference. At least, Rec. ITU-T H.264 (04/2013) section A.2.1 does not mention any such limitation for the Baseline Profile.
Any comment in this regard would be of great help.
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Error concatenating two files with ffmpeg ubuntu
3 janvier 2014, par Dan RamosThe following command works fine in OS X :
ffmpeg -f concat -i videos_playlist.txt -c copy final.mkv
But when I try to run it on ubuntu i get the following :
Unknown input format: 'concat'
Any idea what I'm missing or a possible work around ?
OS X build :
ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
built on Aug 8 2013 11:49:17 with Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)Ubuntu build :
ffmpeg version 0.10.8-7:0.10.8-1~precise1 Copyright (c) 2000-2013 the FFmpeg developers
built on Sep 5 2013 14:56:20 with gcc 4.6.3 -
How to grap voice and vedio in ffmpeg \ mplayer\mencoder ?
4 février 2013, par Kill KillMy target is to grap voice and vedio via webcamera,there are three ways to do :
1.ffmpeg -f oss -i /dev/dsp -f video4linux2 -r 25 -b 500000 -s 320x240 -i /dev/video0 out.mpg
WARNING : gnome-keyring: : couldn't connect to : /home/debian/.cache/keyring-4Hzs4r/pkcs11 : No such file or directory
ffmpeg version 0.8.5-6:0.8.5-1, Copyright (c) 2000-2012 the Libav developers
built on Jan 13 2013 16:02:15 with gcc 4.7.2
* THIS PROGRAM IS DEPRECATED *
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
[oss @ 0x9d63c60] /dev/dsp : No such file or directory
/dev/dsp : Input/output errorin my computer how to revise it ?
2.mplayer tv :// -tv driver=v4l2:input=0:width=640:height=480:fps=25 -vo x11
i can see the veido when the command run ,how can l save the output into a file and grap the voice ?3.mencoder tv :// -tv driver=v4l2:width=800:height=600:device=/dev/video0:fps=30:outfmt=yuy2:forceaudio:alsa:adevice=hw.2,0 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800 -ffourcc xvid -oac mp3lame -lameopts cbr=128 -o output.avi
MEncoder svn r34540 (Debian), built with gcc-4.7 (C) 2000-2012 MPlayer Team
success : format : 9 data : 0x0 - 0x0
TV file format detected.
Selected driver : v4l2
name : Video 4 Linux 2 input
author : Martin Olschewski
comment : first try, more to come
v4l2 : your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead.
Selected device : PC Camera
Capabilities : video capture read/write streaming
supported norms :
inputs : 0 = zc3xx ;
Current input : 0
Current format : unknown (0x4745504a)
tv.c : norm_from_string(pal) : Bogus norm parameter, setting default.
v4l2 : ioctl enum norm failed : Inappropriate ioctl for device
Error : Cannot set norm !
Selected input hasn't got a tuner !
ALSA lib pcm_hw.c:1401 :(_snd_pcm_hw_open) Invalid value for card
Error opening audio : No such file or directory
ALSA lib pcm_hw.c:1401 :(_snd_pcm_hw_open) Invalid value for card
Error opening audio : No such file or directory
ALSA lib pcm_hw.c:1401 :(_snd_pcm_hw_open) Invalid value for card
Error opening audio : No such file or directory
v4l2 : ioctl set mute failed : Invalid argument
v4l2 : 0 frames successfully processed, 0 frames dropped.
============ Sorry, this file format is not recognized/supported =============
=== If this file is an AVI, ASF or MPEG stream, please contact the author ! ===
Cannot open demuxer.Exiting...