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Autres articles (43)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • Les vidéos

    21 avril 2011, par

    Comme 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 (...)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

Sur d’autres sites (6849)

  • Merge commit '3794062ab1a13442b06f6d76c54dce51ffa54697'

    9 avril 2017, par Clément Bœsch
    Merge commit '3794062ab1a13442b06f6d76c54dce51ffa54697'

    * commit '3794062ab1a13442b06f6d76c54dce51ffa54697' :
    
  Remove Plan 9 support
    

    Merged-by : Clément Bœsch <u@pkh.me>
    • [DH] Makefile
    • [DH] compat/plan9/head
    • [DH] compat/plan9/main.c
    • [DH] compat/plan9/printf
    • [DH] configure
    • [DH] doc/platform.texi
    • [DH] libavformat/os_support.h
    • [DH] library.mak
    • [DH] tests/api/Makefile
    • [DH] tests/checkasm/Makefile

  • VLC - Could someone assist me into improving latency in streaming to web based app ?

    19 janvier 2017, par zyeek

    I have been looking for solutions in which I can stream an IP camera’s stream to HTML 5. Currently as is it doesn’t support RTSP so easily.

    I am trying to be able to view the camera’s stream as live as possible. I was hoping someone could help me achieve that. I have been playing with it to get something workable, but at the moment I get a 5s delay stream. It is smooth, but wish to get it hopefully within <1-2s delay if possible.

    My current setup goes from taking my IP camera’s stream in RTSP and converting it to a webm and streaming it to a url, which then I plan on using that to put else where in a web app.

    What I would like to achieve

    Use a protocol that has low latency with audio was well. Webm was used as test, but I can’t seem to get other commands to get the proper stream to be going.

    I would like to use DASH, but from reading FFMPEG currently doesn’t support it. I was thinking maybe RTMP would be good enough for now, being both low latency and HTTP 5 compatible. I am just unable to figure out how to get FFMPEG to transcode the RTSP to RTMP.

    SETUP :

    I am using ffserver and ffmpeg. Overall scope : trying to pull IP camera stream and put it on a web app.

    Framework I am use is Meteor JS. So, I am trying to few plugins or outside complex setups as I want to be able to deploy this Meteor app on mobile devices as well. So, I want to stay within the boundaries of what HTML 5 can support.

    My current ffserver setup is ffserver.conf (this was taking from bunch of different place :

    HTTPPort 8090                      # Port to bind the server to
    
HTTPBindAddress 0.0.0.0
    
MaxHTTPConnections 2000
    
MaxClients 1000
    
MaxBandwidth 10000             # Maximum bandwidth per client
    
                               # set this high enough to exceed stream bitrate
    
CustomLog -
    

    
<feed>
    
     File /tmp/feed.ffm
    
     FileMaxSize 100K
    
     ACL allow 127.0.0.1
    
</feed>
    

    

    
<stream>
    
     Format webm
    
     Feed feed.ffm
    
     NoAudio
    
     VideoCodec libvpx
    
     VideoFrameRate 24
    
     VideoBitRate 1024
    
     VideoSize 480x270
    
     VideoBufferSize 1024
    
     AVOptionVideo flags +global_header
    
     StartSendOnKey
    
</stream>
    

    
<stream>            # Server status URL
    
   Format status
    
   # Only allow local people to get the status
    
   ACL allow localhost
    
</stream>
    

    
<redirect>    # Just an URL redirect for index
    
   # Redirect index.html to the appropriate site
    
   URL url/
    
</redirect>

    Works normally :

    ffserver version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-frei0r --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2/include/openjpeg-2.1 --enable-nonfree --enable-vda
    
  libavutil      55. 34.100 / 55. 34.100
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.100 / 57. 56.100
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libavresample   3.  1.  0 /  3.  1.  0
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
/etc/ffserver.conf:27: Setting default value for video bit rate tolerance = 256000. Use NoDefaults to disable it.
    
/etc/ffserver.conf:27: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
    
/etc/ffserver.conf:27: Setting default value for video max rate = 2048000. Use NoDefaults to disable it.
    
Wed Jan 18 17:04:30 2017 FFserver started.

    Now I give life to the feed with ffmpeg. Command I use :

    ffmpeg -vsync 2 -i rtsp://admin:password@192.168.2.165:88/videoMain -map 0 http://localhost:8090/feed.ffm

    which gives the result :

    ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-frei0r --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2/include/openjpeg-2.1 --enable-nonfree --enable-vda
    
  libavutil      55. 34.100 / 55. 34.100
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.100 / 57. 56.100
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libavresample   3.  1.  0 /  3.  1.  0
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
Guessed Channel Layout for Input Stream #0.1 : mono
    
Input #0, rtsp, from 'rtsp://admin:password@192.168.2.165:88/videoMain':
    
  Metadata:
    
    title           : IP Camera Video
    
    comment         : videoMain
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: h264 (Main), yuv420p(progressive), 1280x720, 90k tbr, 90k tbn, 180k tbc
    
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
    
[libvpx @ 0x7fd58184a600] v1.6.0
    
Output #0, ffm, to 'http://localhost:8090/feed.ffm':
    
  Metadata:
    
    title           : IP Camera Video
    
    comment         : videoMain
    
    creation_time   : now
    
    encoder         : Lavf57.56.100
    
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 480x270, q=-1--1, 1024 kb/s, 90k fps, 1000k tbn, 24 tbc
    
    Metadata:
    
      encoder         : Lavc57.64.101 libvpx
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 8388608 vbv_delay: -1
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> vp8 (libvpx))
    
Press [q] to stop, [?] for help
    
[rtsp @ 0x7fd581000000] max delay reached. need to consume packet
    
[rtsp @ 0x7fd581000000] RTP: missed 5 packets
    
[h264 @ 0x7fd5818ae800] Increasing reorder buffer to 1
    
frame=  139 fps= 18 q=0.0 Lsize=     440kB time=00:00:09.25 bitrate= 389.7kbits/s speed=1.19x    
    
video:429kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.663893%

  • opus : add a native Opus encoder

    11 février 2017, par Rostislav Pehlivanov
    opus : add a native Opus encoder

    This marks the first time anyone has written an Opus encoder without
    
using any libopus code. The aim of the encoder is to prove how far
    
the format can go by writing the craziest encoder for it.
    

    Right now the encoder’s basic, it only supports CBR encoding, however
    
internally every single feature the CELT layer has is implemented
    
(except the pitch pre-filter which needs to work well with the rest of
    
whatever gets implemented). Psychoacoustic and rate control systems are
    
under development.
    

    The encoder takes in frames of 120 samples and depending on the value of
    
opus_delay the plan is to use the extra buffered frames as lookahead.
    
Right now the encoder will pick the nearest largest legal frame size and
    
won’t use the lookahead, but that’ll change once there’s a
    
psychoacoustic system.
    

    Even though its a pretty basic encoder its already outperforming
    
any other native encoder FFmpeg has by a huge amount.
    

    The PVQ search algorithm is faster and more accurate than libopus’s
    
algorithm so the encoder’s performance is close to that of libopus
    
at zero complexity (libopus has more SIMD).
    
The algorithm might be ported to libopus or other codecs using PVQ in
    
the future.
    

    The encoder still has a few minor bugs, like desyncs at ultra low
    
bitrates (below 9kbps with 20ms frames).
    

    Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
    • [DH] configure
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/allcodecs.c
    • [DH] libavcodec/opus_celt.h
    • [DH] libavcodec/opus_pvq.c
    • [DH] libavcodec/opus_pvq.h
    • [DH] libavcodec/opusenc.c

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