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Autres articles (50)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Participer à sa traduction

    10 avril 2011

    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (8555)

  • lavf : Add an MPEG-DASH ISOFF segmenting muxer

    6 octobre 2014, par Martin Storsjö
    lavf : Add an MPEG-DASH ISOFF segmenting muxer
    

    This is mostly to serve as a reference example on how to segment
    the output from the mp4 muxer, capable of writing the segment
    list in four different ways :
    - SegmentTemplate with SegmentTimeline
    - SegmentTemplate with implicit segments
    - SegmentList with individual files
    - SegmentList with one single file per track, and byte ranges

    The muxer is able to serve live content (with optional windowing)
    or create a static segmented MPD.

    In advanced cases, users will probably want to do the segmenting
    in their own application code.

    Signed-off-by : Martin Storsjö <martin@martin.st>

    • [DH] Changelog
    • [DH] configure
    • [DH] libavformat/Makefile
    • [DH] libavformat/allformats.c
    • [DH] libavformat/dashenc.c
    • [DH] libavformat/version.h
  • Segment duration variation is higher than the +/- 50% allowed by DASH-IF

    23 mars 2016, par timhysniu

    I am implement a proof of concept page with video player that uses DASH. I am having a difficult time getting the video right and I am not sure whether this is an encoding issue or MP4Box issue.

    Since I am working on Ubuntu I had to change a few parameters for ffmpeg, but according to what I read this should be fine :

    ~/ffmpeg/ffmpeg -c:a aac -ar 44100 -ac 1 -codec:v libx264 \
     -profile:v baseline -level 13 -b:v 2000k video_transcoded.mp4 -i video.mp4

    Then to create the MPD I am running this :

    MP4Box -dash 10000 -dash-profile live \
     -segment-name video_transcoded video_transcoded.mp4

    I am getting this response at the end, which might be why no player will play my video :

     [DASH] two languages in adaptation set: und will be kept eng will be ignored
     DASHing file video_transcoded.mp4
     [DASH]: Segment duration variation is higher than the  50% allowed by DASH-IF (min 1.044, max 10.448) - please reconsider encoding

    Here is the output of ffmpeg :

       ffmpeg version N-53477-g689211d-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2016 the FFmpeg developers
         built with gcc 5.3.1 (Debian 5.3.1-10) 20160224
         configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --enable-frei0r --enable-libfribidi --disable-indev=sndio --disable-outdev=sndio --enable-librtmp --enable-libmfx --cc=gcc
         libavutil      55. 19.100 / 55. 19.100
         libavcodec     57. 28.100 / 57. 28.100
         libavformat    57. 28.100 / 57. 28.100
         libavdevice    57.  0.101 / 57.  0.101
         libavfilter     6. 39.102 /  6. 39.102
         libswscale      4.  0.100 /  4.  0.100
         libswresample   2.  0.101 /  2.  0.101
         libpostproc    54.  0.100 / 54.  0.100
       Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'gladiator.mp4':
         Metadata:
           major_brand     : isom
           minor_version   : 1
           compatible_brands: isomavc1
           creation_time   : 2013-02-12 19:14:56
         Duration: 02:50:56.98, start: 0.000000, bitrate: 923 kb/s
           Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x544 [SAR 1:1 DAR 40:17], 823 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
           Metadata:
             creation_time   : 2013-02-12 19:14:56
             handler_name    : 2000.Extended.Remastered.720p.BluRay.x264-HDEVO.mkv.264#trackID=1:fps=23.976@GPAC0.5.1-DEV-rev4283
           Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 95 kb/s (default)
           Metadata:
             creation_time   : 2013-02-12 15:32:26
             handler_name    : Sound Media Handler
       [libx264 @ 0xaf12920] using SAR=1/1
       [libx264 @ 0xaf12920] frame MB size (80x34) > level limit (396)
       [libx264 @ 0xaf12920] DPB size (3 frames, 8160 mbs) > level limit (0 frames, 2376 mbs)
       [libx264 @ 0xaf12920] MB rate (65214) > level limit (11880)
       [libx264 @ 0xaf12920] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
       [libx264 @ 0xaf12920] profile Constrained Baseline, level 1.3
       [libx264 @ 0xaf12920] 264 - core 148 r236 a01e339 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=2000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
       Output #0, mp4, to 'gladiator2.mp4':
         Metadata:
           major_brand     : isom
           minor_version   : 1
           compatible_brands: isomavc1
           encoder         : Lavf57.28.100
           Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x544 [SAR 1:1 DAR 40:17], q=-1--1, 2000 kb/s, 23.98 fps, 24k tbn, 23.98 tbc (default)
           Metadata:
             creation_time   : 2013-02-12 19:14:56
             handler_name    : 2000.Extended.Remastered.720p.BluRay.x264-HDEVO.mkv.264#trackID=1:fps=23.976@GPAC0.5.1-DEV-rev4283
             encoder         : Lavc57.28.100 libx264
           Side data:
             cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 0 vbv_delay: -1
           Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 69 kb/s (default)
           Metadata:
             creation_time   : 2013-02-12 15:32:26
             handler_name    : Sound Media Handler
             encoder         : Lavc57.28.100 aac
       Stream mapping:
         Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
         Stream #0:1 -> #0:1 (aac (native) -> aac (native))
       Press [q] to stop, [?] for help

    After transcoding is completed I get this :

    frame=  132 fps= 15 q=25.0 Lsize=    1112kB time=00:00:05.31 bitrate=1713.0kbits/s speed=0.603x    
    video:1062kB audio:45kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.414602%
    [libx264 @ 0xab63de0] frame I:1     Avg QP:21.29  size:121187
    [libx264 @ 0xab63de0] frame P:131   Avg QP:23.40  size:  7372
    [libx264 @ 0xab63de0] mb I  I16..4:  9.2%  0.0% 90.8%
    [libx264 @ 0xab63de0] mb P  I16..4:  0.9%  0.0%  0.3%  P16..4: 37.2%  7.0%  1.8%  0.0%  0.0%    skip:52.7%
    [libx264 @ 0xab63de0] final ratefactor: 21.58
    [libx264 @ 0xab63de0] coded y,uvDC,uvAC intra: 48.8% 72.2% 30.7% inter: 8.9% 14.6% 0.8%
    [libx264 @ 0xab63de0] i16 v,h,dc,p: 28% 33% 18% 21%
    [libx264 @ 0xab63de0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 16% 15%  8%  7%  8%  6% 12%  6%
    [libx264 @ 0xab63de0] i8c dc,h,v,p: 52% 21% 19%  8%
    [libx264 @ 0xab63de0] ref P L0: 92.9%  5.2%  1.8%
    [libx264 @ 0xab63de0] kb/s:1646.80
    [aac @ 0xab64c40] Qavg: 112.650

    What can I do to make this work ?

  • avformat/dashenc : Enable dash output to work when the output isn’t a local file

    6 janvier 2016, par Raymond Hilseth
    avformat/dashenc : Enable dash output to work when the output isn’t a local file
    

    Use avpriv_io_move instead of ff_rename to support more than only
    the file protocol.

    Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>

    • [DH] libavformat/dashenc.c