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Autres articles (35)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

Sur d’autres sites (5709)

  • Audio video duration matching for infinite dash loop pseudo live

    19 janvier 2020, par Massimo Vantaggio

    May I ask help to understand how to match audio and video duration during ffmpeg encoding for a concatenation of videos destined to an infinite loop mpeg dash transmission (mp4box).

    My issue happen during ffmpeg encoding :

    first step for audio encoding and timebase uniformity of each video before the concat/encode process :

    ffmpeg -y -i "$f" -c copy -video_track_timescale 90k -c:a aac -b:a 384k -ar 44100 -ac 2 -shortest -af aresample=async=1 ../buffer/${NAME}_buffer.mp4

    Then concat/encode process in order to get total duration in seconds multiple of closed GOP
    for example : cutting 373.5 duration to obtain 372.000 duration :

    ffmpeg -f concat -safe 0 -y -i list.txt -loop 1 -i ../logo/logo.png -c:a copy -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -r $FPSC -b:v 4800k -maxrate 9600k -bufsize 19200k -profile:v main -crf 22 -filter_complex "[0:v][1:v]overlay=main_w-overlay_w-10:10,scale=1920:1080,setsar=1" -t $TOTDUR 1080set.mp4

    the result

    VIDEO FORMAT CONTAINER DURATION:
    372.000000
    VIDEO STREAM DURATION:
    372.000000
    AUDIO FORMAT CONTAINER DURATION:
    372.006000

    I need help to understand why the audio duration counts 6 ms more than video duration and how to fix it.
    I read about loop_stream should help ?
    Thanks a lot !

    Below the videos info :

    Metadata:
       major_brand     : isom
       minor_version   : 1
       compatible_brands: isomavc1
       creation_time   : 2007-05-09T07:55:25.000000Z
     Duration: 00:01:29.22, start: 0.000000, bitrate: 7490 kb/s
       Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x816, 7403 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
       Metadata:
         creation_time   : 2007-05-09T07:55:25.000000Z
         handler_name    : GPAC ISO Video Handler
       Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 94 kb/s (default)
       Metadata:
         creation_time   : 2007-05-09T07:55:29.000000Z
         handler_name    : GPAC ISO Audio Handler

     Metadata:
       major_brand     : isom
       minor_version   : 1
       compatible_brands: isomavc1
       creation_time   : 2007-07-17T09:18:37.000000Z
       genre           : Trailer
       artist          : Fox
       title           : The Simpsons Movie
       date            : 2007
     Duration: 00:02:17.25, start: 0.000000, bitrate: 8591 kb/s
       Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x800, 8486 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
       Metadata:
         creation_time   : 2007-07-17T09:18:37.000000Z
         handler_name    : GPAC ISO Video Handler
       Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, 5.1, fltp, 107 kb/s (default)
       Metadata:
         creation_time   : 2007-07-17T09:18:45.000000Z
         handler_name    : GPAC ISO Audio Handler
       Stream #0:2: Video: mjpeg (Progressive), yuvj420p(pc, bt470bg/unknown/unknown), 101x150 [SAR 72:72 DAR 101:150], 90k tbr, 90k tbn, 90k tbc (attached pic)

     Metadata:
       major_brand     : mp42
       minor_version   : 0
       compatible_brands: mp42isomavc1
       creation_time   : 2013-12-01T03:59:56.000000Z
       genre           : Trailer
       artist          : Warner Bros.
       title           : Gravity - 2K Trailer
       encoder         : HandBrake 0.9.9 2013051800
       date            : 2013
     Duration: 00:02:27.07, start: 0.000000, bitrate: 20296 kb/s
       Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 2048x858, 20149 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc (default)
       Metadata:
         creation_time   : 2013-12-01T03:59:56.000000Z
         encoder         : JVT/AVC Coding
       Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 153 kb/s (default)
       Metadata:
         creation_time   : 2013-12-01T03:59:56.000000Z
       Stream #0:2: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 102x150 [SAR 72:72 DAR 17:25], 90k tbr, 90k tbn, 90k tbc (attached pic)
  • Best way to convert a 59.94fps video to 29.97 ?

    17 novembre 2015, par manatails

    I am tryiing to normalize the clips from multiple cameras for an amateur movie.
    Thinking that 29.97 fps is the best choice for my case but my camcorder only supports recording at 59.94fps or 24fps.

    What is the best way to halve the framerate down to 29.97fps, perhaps skipping every other frame ?
    I usually use ffmpeg for transcoding but I couldn’t find much resource on changing the actual framerate.

  • Split large amount of wav files to small parts

    23 janvier 2017, par Tadeáš Pešek

    I have large amount of wav files (over 50 000) and I need to split every wav file to 10 second long parts. It’s nearly impossible to do it one by one, so my question is : is there any way to do it in ffmpeg or for example in sox ? I’m an amateur, so I need exact instructions. Please, if you can, write it like you would for a dummy :)... (I’m a Windows 7 user)

    Here is my try with sox

    Thank you !