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  • 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 (...)

  • Création définitive du canal

    12 mars 2010, par

    Lorsque votre demande est validée, vous pouvez alors procéder à la création proprement dite du canal. Chaque canal est un site à part entière placé sous votre responsabilité. Les administrateurs de la plateforme n’y ont aucun accès.
    A la validation, vous recevez un email vous invitant donc à créer votre canal.
    Pour ce faire il vous suffit de vous rendre à son adresse, dans notre exemple "http://votre_sous_domaine.mediaspip.net".
    A ce moment là un mot de passe vous est demandé, il vous suffit d’y (...)

  • Pas question de marché, de cloud etc...

    10 avril 2011

    Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
    sur le web 2.0 et dans les entreprises qui en vivent.
    Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
    Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
    le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
    Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...)

Sur d’autres sites (8944)

  • Embedding Metadata to H.264 encoded file

    7 septembre 2012, par kerim yucel

    I am currently developing an application which produces certain metadata with respect to preview frames coming from the camera. I can see this metadata being produced properly and I have no problems here.

    However, I have to embed this metadata to these frames of interest (frames are processed by a native algorithm to produce this metadata). I am using ffmpeg with x264 to encode the frames into H.264. I have checked x264.h and some documentations but failed to find what I seek.

    My question is ; is there any unused portion of H.264 syntax that I can embed my metadata to encoded frames ?

    I hope I was clear enough. Thanks in advance.

  • MPEG-TS Segments HTTP Live Streaming

    5 juin 2013, par user1069624

    I'm trying to interleave MPEG-TS segments but failing. One set of segments was actually captured using the built in camera in the laptop, then encoded using FFMPEG with the following command :

    ffmpeg -er 4 -y -f video4linux2 -s 640x480 -r 30 -i %s -isync -f mpegts -acodec libmp3lame -ar 48000 -ab 64k -s 640x480 -vcodec libx264 -fflags +genpts -b 386k -coder 0 -me_range 16 -keyint_min 25 -i_qfactor 0.71 -bt 386k -maxrate 386k -bufsize 386k -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -aspect 640:480

    And the other one is an avi file that was encoded using the following command :

    fmpeg -er 4 -y -f avi -s 640x480 -r 30 -i ./DSCF2021.AVI -vbsf dump_extra -f mpegts -acodec libmp3lame -ar 48000 -ab 64k -s 640x480 -vcodec libx264 -fflags +genpts -b 386k -coder 0 -me_range 16 -keyint_min 25 -i_qfactor 0.71 -bt 386k -maxrate 386k -bufsize 386k -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -aspect 640:480

    Then the output is segmented into ts segments using an open source segmenter.

    If both come from the same source (both from the camera) they work fine. However in this case, the second set of segments freeze. Time passes, but the video does not move..
    So i think it's an encoding problem. So my question is, how should i change the ffmpeg command for this to work ?

    By interleave I mean, having a playlist with the first set of segments, and another playlist with the other set of segments, and having the client call one then the other (HTTP Live Streaming)

    The ffprobe output of one of the first set of segments :

    Input #0, mpegts, from 'live1.ts':
    
  Duration: 00:00:09.76, start: 1.400000, bitrate: 281 kb/s
    
  Program 1 Service01
    
    Metadata:
    
      name            : Service01
    
      provider_name   : FFmpeg
    
    Stream #0.0[0x100]: Video: h264, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 29.92 fps, 29.92 tbr, 90k tbn, 59.83 tbc
    
    Stream #0.1[0x101]: Audio: aac, 48000 Hz, stereo, s16, 111 kb/s

    The ffprobe output of one of the second set of segments :

    Input #0, mpegts, from 'ad1.ts':
    
  Duration: 00:00:09.64, start: 1.400000, bitrate: 578 kb/s
    
  Program 1 Service01
    
    Metadata:
    
      name            : Service01
    
      provider_name   : FFmpeg
    
    Stream #0.0[0x100]: Video: h264, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
    
    Stream #0.1[0x101]: Audio: aac, 48000 Hz, stereo, s16, 22 kb/s

    Thank you,

  • Joining and cutting mpeg 2 video files

    4 janvier 2012, par D.Rosado

    I have multiple mpeg2 video files. What I need to do is get a clip of video that is contained in several of these mpeg2 videos. What I'm doing at the moment is :

    • Join them using the command :

          copy /b file1.mpg + ... + fileN.mpg output.mpg

    • The ouput.mpg duration is wrong so I'm using FFMpeg to fix that :

          ffmpeg -y -i output.mpeg -target pal-dvd outputFixed.mpg

    The problem is when I try to extract only one portion of this output.mpg, at the same time I "fix" it, with the -ss and -t FFMpeg commands becouse the video duration is wrong as i said.

    So the question is :

    • Is there any way to combine Mpeg2 files without getting the duration wrong ?
    • Is there any way to fix the duration of a Mpeg2 file and extract one portion at the same time ?

    Any suggestion would be appreciated.

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