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Autres articles (97)

  • MediaSPIP 0.1 Beta version

    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Encodage et transformation en formats lisibles sur Internet

    10 avril 2011

    MediaSPIP transforme et ré-encode les documents mis en ligne afin de les rendre lisibles sur Internet et automatiquement utilisables sans intervention du créateur de contenu.
    Les vidéos sont automatiquement encodées dans les formats supportés par HTML5 : MP4, Ogv et WebM. La version "MP4" est également utilisée pour le lecteur flash de secours nécessaire aux anciens navigateurs.
    Les documents audios sont également ré-encodés dans les deux formats utilisables par HTML5 :MP3 et Ogg. La version "MP3" (...)

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  • FFmpeg synthesizes multiple videos, the final result is only sound, no picture display

    6 juillet 2023, par Halifax

    1、I first converted mp4 to ts：

    


    -i MyVideo.mp4 -vcodec copy -acodec aac -b:v 10000k MyVideo.ts


    


    2、Then scale the ts and fill the empty space：

    


    -i MyVideo.ts -vf pad=width=iw:height=ih:x=-1:y=0:color='White' -b:v 10000k MyVideo_transform.ts


    


    3、Finally use concat to merge into mp4 files：

    


    -i "concat:MyVideo_transform1.ts|MyVideo_transform2.ts" -acodec copy -vcodec copy -absf aac_adtstoasc -b:v 10000k $outputFilePath"


    


    Finally use concat to merge into mp4 files。

    


    I hope that the final merged result can see the video picture。

    


  • FFMPEG - 2-pass video conversion final file size is larger than expected

    14 juin 2022, par Kevin Korb

    We are converting files and the target filesize is important. For one version of the video it can not be above 750KB.

    


    We are using the 2-pass encoding and specifying the target audio bitrate and target video bitrate, however the longer the duration of the video, the larger the file becomes and exceeds our 750KB target.

    


    


    For example, our file is 53.3 seconds, we know our final target of
750KB. We like our audio at 48kbps (mono).

    


    So we calculate our target (total) bitrate at : 750*8/53.3 = 112.57
total kbps Audio bitrate = 48kbps Video bitrate = 112-48 = 64kbps
video

    


    We would expect the file produced to be 746.2KB. (112*53.3 / 8)

    


    The file produced is 850k(ish).

    


    


    Is there something that takes up space in the file that isn't video or audio that we need to take into consideration ?

    


  • Can someone explain the reorder_queue_size option of rtsp input in ffmpeg ?

    10 août 2018, par albert200000

    I can’t find any information about it except one sentence in documentation - Set number of packets to buffer for handling of reordered packets.
    Can it help with unstable network or stream ? What default value is and what value should be set and when ?

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