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  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP 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, par

    MediaSPIP 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 (7342)

  • fate : Prefix cllc tests with canopus

    9 avril 2015, par Vittorio Giovara
    fate : Prefix cllc tests with canopus

    They belong to the same family of codecs.
    • [DH] tests/fate/lossless-video.mak
    • [DH] tests/ref/fate/canopus-cllc-argb
    • [DH] tests/ref/fate/canopus-cllc-rgb
    • [DH] tests/ref/fate/canopus-cllc-yuy2-noblock

  • Damaged h264 stream not working with ffmpeg but working with vlc or mplayer

    15 avril 2013, par gregoiregentil

    I have a h264 file, coming from an rtsp stream, that is slightly damaged. Some frames are altered.

    ffmpeg reports :

    ffmpeg -i stream.mpg 
    
ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    
  built on Apr  2 2013 17:00:59 with gcc 4.6.3
    
*** THIS PROGRAM IS DEPRECATED ***
    
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
    

    
Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
    
Input #0, mpegts, from 'a.mpg':
    
  Duration: 00:03:18.84, start: 93370.745522, bitrate: 2121 kb/s
    
  Program 1 
    
    Stream #0.0[0x44](): Video: h264 (Baseline), yuv420p, 640x480, 90k tbr, 90k tbn, 180k tbc
    
At least one output file must be specified

    I can play the file with VLC or mplayer. Obviously, the damaged frames are "kind of blurred" but it's working. mplayer reports :

    mplayer stream.mpg
    
MPlayer2 UNKNOWN (C) 2000-2011 MPlayer Team
    
mplayer: could not connect to socket
    
mplayer: No such file or directory
    
Failed to open LIRC support. You will not be able to use your remote control.
    

    
Playing stream.mpg.
    
Detected file format: MPEG-2 transport stream format (libavformat)
    
[lavf] stream 0: video (h264), -vid 0
    
LAVF: Program 1 
    
VIDEO:  [H264]  640x480  0bpp  90000.000 fps    0.0 kbps ( 0.0 kbyte/s)
    
Load subtitles in .
    
[ass] auto-open
    
==========================================================================
    
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
    
Asking decoder to use 2 threads if supported.
    
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
    
==========================================================================
    
Audio: no sound
    
Starting playback...
    
V:   0.0   0/  0 ??% ??% ??,?% 0 0 
    
Movie-Aspect is undefined - no prescaling applied.
    
VO: [xv] 640x480 => 640x480 Planar YV12 
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!

    When I try to re-encode the file with :

    ffmpeg -i stream.mpg -fflags +genpts -an -vcodec mpeg4 -r 65535/2733 stream.mp4

    ffmpeg seems to jump over the altered frames. The length of stream.mp4 << length of stream.mpg

    How could I fix this problem, i.e. having ffmpeg to output something similar to what mplayer and vlc output ?

  • Started Programming Young

    6 septembre 2011, par Multimedia Mike — Programming

    I have some of the strangest memories of my struggles to jump into computer programming.

    Back To BASIC
    I remember doing some Logo programming on Apple II computers at school in 5th grade (1987 timeframe). But that was mostly driving turtle graphics. Then I remember doing some TRS-80 BASIC in 7th grade, circa 1989. Emboldened by what very little I had learned in perhaps the week or 2 we took in a science class to do this, I tried a little GW-BASIC on my family’s “IBM-PC compatible” computer (they were still called that back then). I still remember what my first program consisted of. Even back then I was interested in manipulating graphics and color on a computer screen. Thus :

    10 color 1
20 print "This is color 1"
30 color 2
40 print "This is color 2"
...

    And so on through 15 colors. Hey, it did the job– it demonstrated the 15 different colors you could set in text mode.

    What’s FOR For ?
    That 7th grade computer unit in science class wasn’t very thick on computer science details. I recall working with a lab partner to transcribe code listings into a computer (and also saving my work to a storage cassette). We also developed form processing programs that would print instructions to input text followed by an “INPUT I$” statement to obtain the user’s output.

    I remember there was some situation where we needed a brief delay between input and printing. The teacher told us to use a construct of the form :

    10 FOR I = 1 TO 20000
20 NEXT I

    We had to calibrate the number based on our empirical assessment of how long it lasted but I recall that the number couldn’t be much higher than about 32000, for reasons that would become clearer much later.

    Imagine my confusion when I would read and try to comprehend BASIC program code I would find in magazines. I would of course see that FOR..NEXT construct all over the place but obviously not in the context of introducing deliberate execution delays. Indeed, my understanding of one of the fundamental building blocks of computer programming — iteration — was completely skewed because of this early lesson.

    Refactoring
    Somewhere along the line, I figured out that the FOR..NEXT could be used to do the same thing a bunch of times, possibly with different values. A few years after I had written that color program, I found it again and realized that I could write it as :

    10 for I = 1 to 15
20 color I
30 print I
40 next I

    It still took me a few more years to sort out the meaning of WHILE..WEND, though.

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