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  • 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" (...)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

Sur d’autres sites (6750)

  • Revision af31b27aae : Optimze inv 16x16 DCT with 10 non-zero coeffs - P2 This commit further optimize

    9 janvier 2014, par Jingning Han

    Changed Paths :
     Modify /vp9/common/x86/vp9_idct_intrin_sse2.c



    Optimze inv 16x16 DCT with 10 non-zero coeffs - P2

    This commit further optimizes SSE2 operations in the second 1-D
    inverse 16x16 DCT, with (<10) non-zero coefficients. The average
    runtime of this module goes down from 779 cycles -> 725 cycles.

    Change-Id : Iac31b123640d9b1e8f906e770702936b71f0ba7f

  • Generating 64kbps audio-only mpegts for HTTP Live segmenter to meept 64kbps audio only requirement

    23 avril 2012, par Pobre

    I am trying to convert our mp4 files into mpeg-ts and segment it into .ts files for my iphone app to play. I am using Carson McDonalds's HTTP-Live-Video-Stream-Segmenter-and-Distributor to do that.

    I got his stuff complied and working correctly. I am currently trying to meet Apple's requirement where I need to provide a baseline 64 kbps audio only stream to my m3u8 playlist.
    Carson doesn't seem to have a profile for that.

    I need to be able to generate 64kbps audio-only stream from mp4, and turn that into mpeg-ts for the segmenter into ts. I am trying to find the right ffmpeg command that will validate without problem using Apple's mediastreamvalidator.

    So far I modified an existing encoding profile to try to achieve 64kbps total :

    ffmpeg -er 4 -i %s -f mpegts -acodec libmp3lame -ar 22050 -ab 32k -s 240x180 -vcodec libx264 -b 16k -flags +loop+mv4 -cmp 256 -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 64k -maxrate 16k -bufsize 16k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -aspect 4:3 -r 10 -g 30 -async 2 - | %s %s %s %s %s

    but then when I try to validate it using mediastreamvalidator, it gives error after few ts :

    Playlist Validation : OK

    Segments :

    sample_cell_4x3_64k-00001.ts :

    WARNING : Media segment exceeds target duration of 10.00 seconds by 1.30 seconds (segment duration is 11.30 seconds)

    sample_cell_4x3_64k-00002.ts :

    WARNING : Media segment exceeds target duration of 10.00 seconds by 1.40 seconds (segment duration is 11.40 seconds)

    ....
    ....

    sample_cell_4x3_64k-00006.ts :

    ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
    ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

    sample_cell_4x3_64k-00007.ts :

    ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
    ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

    ....
    ....
    Average segment duration : 10.26 seconds
    Average segment bitrate : 376797.92 bps
    Average segment structural overhead : 349242.17 bps (92.69 %)

    Is there someway I can generate this correctly with just audio which totals 64kbps and turn it into mpeg-ts ready to be segmented and validated correctly ?

    Am I approaching the problem right ?

  • parser not found for codec wmav2

    5 décembre 2011, par HashCoder

    I am getting a warning when I run the below command.

    Warning : [asf @ 01C787A0] parser not found for codec wmav2, packets or times may be inval
    id.

    I am using the latest ffmpeg.exe, did I miss any parameters. Any suggestions please.

    ffmpeg -i Assets\Logitech_webcam_on_PC.wmv -sameq -f swf -y -an -s 640x360 MySlide.swf
    ffmpeg version N-35295-gb55dd10, Copyright (c) 2000-2011 the FFmpeg developers
     built on Nov 30 2011 00:52:52 with gcc 4.6.2
     configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
    ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
    ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
    able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
    -enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
    c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
    libxvid --enable-zlib
     libavutil    51. 29. 1 / 51. 29. 1
     libavcodec   53. 39. 1 / 53. 39. 1
     libavformat  53. 22. 0 / 53. 22. 0
     libavdevice  53.  4. 0 / 53.  4. 0
     libavfilter   2. 50. 0 /  2. 50. 0
     libswscale    2.  1. 0 /  2.  1. 0
     libpostproc  51.  2. 0 / 51.  2. 0
    [asf @ 01C787A0] parser not found for codec wmav2, packets or times may be inval
    id.

    Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000
    /1) -> 0.08 (1/12)
    Input #0, asf, from &#39;Assets\Logitech_webcam_on_PC.wmv&#39;:
     Metadata:
       WMFSDKVersion   : 11.0.5721.5265
       WMFSDKNeeded    : 0.0.0.0000
       IsVBR           : 1
       VBR Peak        : 50500.0000
       Buffer Average  : 66550.0000
     Duration: 00:00:36.22, start: 0.000000, bitrate: 497 kb/s
       Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 32000 Hz, 1 channels,
    s16, 20 kb/s
       Stream #0:1(eng): Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 320x180, 422 kb/
    s, 0.08 tbr, 1k tbn, 1k tbc
    [buffer @ 02AA9760] w:320 h:180 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
    [scale @ 02AA9A80] w:320 h:180 fmt:yuv420p -> w:640 h:360 fmt:yuv420p flags:0x4
    Output #0, swf, to &#39;MySlide.swf&#39;:
     Metadata:
       WMFSDKVersion   : 11.0.5721.5265
       WMFSDKNeeded    : 0.0.0.0000
       IsVBR           : 1
       VBR Peak        : 50500.0000
       Buffer Average  : 66550.0000
       encoder         : Lavf53.22.0
       Stream #0:0(eng): Video: flv1, yuv420p, 640x360, q=2-31, 200 kb/s, 90k tbn,
    0.08 tbc
    Stream mapping:
     Stream #0:1 -> #0:0 (wmv2 -> flv)
    Press [q] to stop, [?] for help
    frame=    4 fps=  0 q=0.0 size=      97kB time=00:00:48.00 bitrate=  16.6kbits/s
    frame=    5 fps=  0 q=0.0 Lsize=     111kB time=00:01:00.00 bitrate=  15.2kbits/
    s dup=0 drop=599
    video:111kB audio:0kB global headers:0kB muxing overhead 0.128646%