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  • Personnaliser les catégories

    21 juin 2013, par

    Formulaire de création d’une catégorie
    Pour ceux qui connaissent bien SPIP, une catégorie peut être assimilée à une rubrique.
    Dans le cas d’un document de type catégorie, les champs proposés par défaut sont : Texte
    On peut modifier ce formulaire dans la partie :
    Administration > Configuration des masques de formulaire.
    Dans le cas d’un document de type média, les champs non affichés par défaut sont : Descriptif rapide
    Par ailleurs, c’est dans cette partie configuration qu’on peut indiquer le (...)

  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

Sur d’autres sites (4424)

  • FFMpeg and WebM/VP8

    25 novembre 2011, par Anand Suresh

    I am trying to use ffmpeg and ffserver to stream VP8 video.

    I am using the following command to start FFMpeg :

    ffmpeg -v 9 -loglevel 99 -f x11grab -s 1440x900 -r2 -i :0.0 -f webm http://localhost:8090/feed1.ffm

    The above command abruptly terminates generating the following error :

    > FFmpeg version 0.6.2-4:0.6.2-1ubuntu1.1, Copyright (c) 2000-2010 the Libav developers
    
  built on Sep 16 2011 16:57:46 with gcc 4.5.2
    
  configuration: --extra-version=4:0.6.2-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
    
  WARNING: library configuration mismatch
    
  libavutil   configuration: --extra-version=4:0.6.2-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
    
  libavcodec  configuration: --extra-version=4:0.6.2-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
    
  libavformat configuration: --extra-version=4:0.6.2-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
    
  libavdevice configuration: --extra-version=4:0.6.2-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
    
  libavfilter configuration: --extra-version=4:0.6.2-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
    
  libswscale  configuration: --extra-version=4:0.6.2-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
    
  libpostproc configuration: --extra-version=4:0.6.2-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
    
  libavutil     50.15. 1 / 50.15. 1
    
  libavcodec    52.72. 2 / 52.72. 2
    
  libavformat   52.64. 2 / 52.64. 2
    
  libavdevice   52. 2. 0 / 52. 2. 0
    
  libavfilter    1.19. 0 /  1.19. 0
    
  libswscale     0.11. 0 /  0.11. 0
    
  libpostproc   51. 2. 0 / 51. 2. 0
    
[x11grab @ 0x9869420]device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1440 height: 900
    
[x11grab @ 0x9869420]shared memory extension  found
    
[x11grab @ 0x9869420]Probe buffer size limit 5000000 reached
    
[x11grab @ 0x9869420]Estimating duration from bitrate, this may be inaccurate
    
Input #0, x11grab, from ':0.0':
    
  Duration: N/A, start: 1322253753.374957, bitrate: 41472 kb/s
    
    Stream #0.0, 1, 1/1000000: Video: rawvideo, bgra, 1440x900, 1/1, 41472 kb/s, 1 tbr, 1000k tbn, 1 tbc
    
[libvpx @ 0x9876540]v0.9.6
    
[libvpx @ 0x9876540]--enable-pic --enable-shared --disable-install-bins --disable-install-srcs --target=x86-linux-gcc
    
[libvpx @ 0x9876540]vpx_codec_enc_cfg
    
[libvpx @ 0x9876540]generic settings
    
  g_usage:                      0
    
  g_threads:                    0
    
  g_profile:                    0
    
  g_w:                          320
    
  g_h:                          240
    
  g_timebase:                   {1/30}
    
  g_error_resilient:            0
    
  g_pass:                       0
    
  g_lag_in_frames:              0
    
[libvpx @ 0x9876540]rate control settings
    
  rc_dropframe_thresh:          0
    
  rc_resize_allowed:            0
    
  rc_resize_up_thresh:          60
    
  rc_resize_down_thresh:        30
    
  rc_end_usage:                 0
    
  rc_twopass_stats_in:          (nil)(0)
    
  rc_target_bitrate:            256
    
[libvpx @ 0x9876540]quantizer settings
    
  rc_min_quantizer:             4
    
  rc_max_quantizer:             63
    
[libvpx @ 0x9876540]bitrate tolerance
    
  rc_undershoot_pct:            95
    
  rc_overshoot_pct:             200
    
[libvpx @ 0x9876540]decoder buffer model
    
  rc_buf_sz:                    6000
    
  rc_buf_initial_sz:            4000
    
  rc_buf_optimal_sz:            5000
    
[libvpx @ 0x9876540]2 pass rate control settings
    
  rc_2pass_vbr_bias_pct:        50
    
  rc_2pass_vbr_minsection_pct:  0
    
  rc_2pass_vbr_maxsection_pct:  400
    
[libvpx @ 0x9876540]keyframing settings
    
  kf_mode:                      1
    
  kf_min_dist:                  0
    
  kf_max_dist:                  9999
    
[libvpx @ 0x9876540]
    
[libvpx @ 0x9876540]vpx_codec_enc_cfg
    
[libvpx @ 0x9876540]generic settings
    
  g_usage:                      0
    
  g_threads:                    1
    
  g_profile:                    0
    
  g_w:                          1440
    
  g_h:                          900
    
  g_timebase:                   {1/1}
    
  g_error_resilient:            0
    
  g_pass:                       0
    
  g_lag_in_frames:              0
    
[libvpx @ 0x9876540]rate control settings
    
  rc_dropframe_thresh:          0
    
  rc_resize_allowed:            0
    
  rc_resize_up_thresh:          60
    
  rc_resize_down_thresh:        30
    
  rc_end_usage:                 0
    
  rc_twopass_stats_in:          (nil)(0)
    
  rc_target_bitrate:            200
    
[libvpx @ 0x9876540]quantizer settings
    
  rc_min_quantizer:             1
    
  rc_max_quantizer:             38
    
[libvpx @ 0x9876540]bitrate tolerance
    
  rc_undershoot_pct:            95
    
  rc_overshoot_pct:             200
    
[libvpx @ 0x9876540]decoder buffer model
    
  rc_buf_sz:                    6000
    
  rc_buf_initial_sz:            4000
    
  rc_buf_optimal_sz:            5000
    
[libvpx @ 0x9876540]2 pass rate control settings
    
  rc_2pass_vbr_bias_pct:        50
    
  rc_2pass_vbr_minsection_pct:  0
    
  rc_2pass_vbr_maxsection_pct:  400
    
[libvpx @ 0x9876540]keyframing settings
    
  kf_mode:                      1
    
  kf_min_dist:                  0
    
  kf_max_dist:                  12
    
[libvpx @ 0x9876540]
    
[libvpx @ 0x9876540]vpx_codec_control
    
[libvpx @ 0x9876540]  VP8E_SET_CPUUSED:             3
    
[libvpx @ 0x9876540]  VP8E_SET_NOISE_SENSITIVITY:   0
    
Output #0, webm, to 'http://127.0.0.1:8090/feed1.ffm':
    
  Metadata:
    
    encoder         : Lavf52.64.2
    
    Stream #0.0, 0, 1/1000: Video: libvpx, yuv420p, 1440x900, 1/1, q=2-31, 200 kb/s, 1k tbn, 1 tbc
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press [q] to stop encoding
    
[webm @ 0x98753b0]Writing block at offset 15, size 158658, pts 0, dts 0, duration 1000, flags 128
    
[webm @ 0x98753b0]Starting new cluster at offset 158681 bytes, pts 0

    Can anyone point out what I am doing wrong here ? Why does ffmpeg die everytime it starts a new cluster ?

    Thanks

  • Launch Leech and the History of WMV

    14 septembre 2010, par Multimedia Mike — General

    I was combing through my programming archives again and came across an old Perl script called launch-leech.pl. This was a private script I used to maintain for the benefit of myself and a few friends. See, there was this site called Launch.com (URL doesn’t seem to do anything as of this writing but here’s the Wikipedia page). Purchased by Yahoo ! in 2001, Launch still maintained their independent branding. They also carried a lot of music videos, of which I am a huge junkie. launch-leech.pl was the tool I used to download the videos. This was particularly useful since I stubbornly clung to dialup internet access until mid-2004 and it would have been impossible to stream video at any decent quality (though there were 56k streams, so like I said– not possible at any decent quality).



    Technically
    I followed Launch.com for many years. To be honest, I only “followed” in that I figured out where their “latest videos” URL lived and regularly polled it. Each video had either a 6-, 7-, or 8-digit unique ID that could be plugged into the launch-leech.pl script which would then have a conversation with the relevant servers, determine the correct streaming URL with the highest quality, then download and save the URL by handing it off to an external program (first ASFRecorder, though I later switched to mmsclient).

    At one point, I even wrote a crawler that compiled an offline database of all the videos, their IDs and their metadata. I never thought of anything interesting to do with it, though.



    Windows Media Legacy
    During these glory days of leeching, Launch.com streamed using Windows Media. I admit, it’s a bit of a blur now — the site might have used Real or QuickTime, but I was obviously most in tune with the WM side. I remember when I first found the site circa 2000-2001, the videos were in MS MPEG-4v3, and the high quality bitrate was 300 kbits/sec. Eventually, Launch.com would stream WMV7, WMV8, and finally WMV9, with bitrates up to 700 kbits/sec. However, they never broke free of the 320×240 encoding resolution, which was frustrating. When I wasn’t able to notice any substantial difference between 300 and 700 kbits/sec, I felt it might be time to put those extra bits to work on a resolution upgrade.

    At least they were nice enough to re-encode a number of old videos using better codecs and bitrates with each revision, thus prompting me to scan through the site collecting updated video IDs for download.



    Epilogue
    I don’t clearly remember when I stopped visiting Launch.com. Video-wise, the web has been a blur of Flash video ever since about 2006. Meanwhile, I spent a lot of time collecting a bunch of music videos in the first half of the decade only to find that pretty much every version of every music video made since the dawn of time is available on demand thanks to YouTube. I have found that this phenomenon manifests in many areas as internet technology marches on.

    The Real Entertainment
    The launch-leech.pl tool represents a recurring pattern for me. I derive as much — if not more — entertainment from creating programs like launch-leech.pl (and implicitly reverse engineering something in the process ; in this case, a website) as I do from the intended entertainment media itself. I seem to have this issue a lot with games, too.

    Is this an issue for anyone else ? Am I the only one who would rather play with the box that a shiny toy comes packaged in ?

  • Reduce HLS latency from +30 seconds

    4 juin 2014, par Rick

    Ubuntu 12.04

    nginx 1.2.4

    avconv -version

    avconv version 0.8.10-4:0.8.10-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    
  built on Feb  6 2014 20:56:59 with gcc 4.6.3
    
avconv 0.8.10-4:0.8.10-0ubuntu0.12.04.1
    
libavutil    51. 22. 2 / 51. 22. 2
    
libavcodec   53. 35. 0 / 53. 35. 0
    
libavformat  53. 21. 1 / 53. 21. 1
    
libavdevice  53.  2. 0 / 53.  2. 0
    
libavfilter   2. 15. 0 /  2. 15. 0
    
libswscale    2.  1. 0 /  2.  1. 0
    
libpostproc  52.  0. 0 / 52.  0. 0

    I’m using avconv and nginx to create an HLS stream but right now my latency is regularly well over 30 seconds. After much reading I am aware that HLS has built in latency and that 10s is expected and even preferred but 30s seems quite extreme.

    I’ve seen a lot of discussion on the nginx-rtmp google group, this thread in particular had a lot of suggestions. I have attempted to reduce solve my issue by reducing the hls_fragment and the hls_playlist_length but they haven’t had a significant effect.

    nginx.conf :

    #user  nobody;
    
worker_processes  1;
    

    
error_log  logs/error.log debug;
    

    
events {
    
    worker_connections  1024;
    
}
    

    
http {
    
    include       mime.types;
    
    default_type  application/octet-stream;
    

    
    sendfile        on;
    
    keepalive_timeout  65;
    

    
    server {
    
        listen       8888;
    
        server_name  localhost;
    

    
        add_header 'Access-Control-Allow-Origin' "*";
    

    
        location /hls {
    
            types {
    
                application/vnd.apple.mpegurl m3u8;
    
                video/mp2t ts;
    
            }
    
            root /tmp;
    
        }
    

    
        # rtmp stat
    
        location /stat {
    
            rtmp_stat all;
    
            rtmp_stat_stylesheet stat.xsl;
    
        }
    
        location /stat.xsl {
    
            # you can move stat.xsl to a different location
    
            root /usr/build/nginx-rtmp-module;
    
        }
    

    
        # rtmp control
    
        location /control {
    
            rtmp_control all;
    
        }
    

    
        error_page   500 502 503 504  /50x.html;
    
        location = /50x.html {
    
            root   html;
    
        }
    
    }
    
}
    

    
rtmp {
    
    server {
    
        listen 1935;
    
        ping 30s;
    
        notify_method get;
    

    
        application myapp {
    
            live on;
    

    
            hls on;
    
            hls_path /tmp/hls;
    
            hls_base_url http://x.x.x.x:8888/hls/;
    
            hls_sync 2ms;
    
            hls_fragment 2s;
    

    
            #hls_variant _low BANDWIDTH=160000;
    
            #hls_variant _mid BANDWIDTH=320000;
    
            #hls_variant _hi BANDWIDTH=640000;
    
        }
    
    }
    
}

    avconv command :

    avconv -r 30 -y -f image2pipe -codec:v mjpeg -i - -f flv -codec:v libx264 -profile:v baseline -preset ultrafast -tune zerolatency -an -f flv rtmp://127.0.0.1:1935/myapp/mystream

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