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  • Qu’est ce qu’un éditorial

    21 juin 2013, par

    Ecrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
    Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
    Vous pouvez personnaliser le formulaire de création d’un éditorial.
    Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...)

  • Les tâches Cron régulières de la ferme

    1er décembre 2010, par

    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
    Le super Cron (gestion_mutu_super_cron)
    Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)

  • Contribute to translation

    13 avril 2011

    You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
    To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
    MediaSPIP is currently available in French and English (...)

Sur d’autres sites (8390)

  • 24kHz audio file problem : unsupported bitrate 64000

    28 novembre 2018, par R. Vait

    I use alexa audio tags a lot. I know that now audio tags support 24kHz audio files so tried converting my audio files from 16kHz. I used the provided command in the docs to do so :

    ffmpeg -i  -ac 2 -codec:a libmp3lame -b:a 48k -ar 24000

    But when I try to play this file, I get an invalid response error, saying : Error: The audio is of an unsupported bitrate 64000. By looking into file details I clearly see, that bitrate is 48kbps and sample rate is 24kHz. I don’t see any value where it would say 64 or anything close to it.

    If I encode my file back to 16kHz it plays fine again.

    It seems that there is a problem with this command, because if I encode my files using audacity, they work with 24kHz. I still would prefer to use ffmpeg, because I need to encode a lot of files.

    I am asking, not about file format, format is correct. I need files in 24kHz sample rate and that is what causes issues. I saw another question about similar problem and others having the discussion there about sample rates, but no one was able to encode file to be 24kHz using ffmpeg.

    Did anyone had any luck on encoding files to 24kHz using ffmpeg ?

  • Finding duration/number of frames of WebM using FFMPEG/libavformat

    12 septembre 2015, par gcgrant

    I’m trying to retrieve the duration and number of frames from a WebM file using FFMPEG and libavformat. I’m adapting some code that was initially written to work with MP4s, and when passing an MP4 it seems to work fine.

    I have FFMPEG 2.1 compiled with the vp8 parser and decoder and the matroska demuxer.

    I have an AVStream pointer to the video stream, *video_st. The code looks for the number of frames in video_st->nb_frames, and for the duration in video_st->duration. These both appear to be 0.

    The API docs for for video_st->duration (https://ffmpeg.org/doxygen/trunk/structAVStream.html#a4e04af7a5a4d8298649850df798dd0b) say that "If a source file does not specify a duration, but does specify a bitrate, this value will be estimated from bitrate and file size." I can confirm that that this file does specify a duration and a bitrate (as I tested it on my desktop with ffmpeg -i). So it seems odd that this is returning 0. Perhaps my FFMPEG build configuration is incorrect ?

    As for nb_frames, the docs say "number of frames in this stream if known or 0". Is there anything I can do if this returns 0 ? Again, ffmpeg -i does return an estimate for fps ; that would be good enough, as I could estimate the number of frames with that and the duration.

    Thanks !

  • mp4 video fragmented using ffmpeg takes long time to start playing

    14 mai 2020, par daldoy

    When using ffmpeg, to stream the output file to S3, it is required to use "-movflags frag_keyframe", and the generated file will be a fragmented mp4.

    



    When I try to play this files from S3 it takes a long time to start playing. I have tried the recommended movflags from MDN Docs and all the possible combinations.

    



    ffmpeg -i https://notreal-bucket.s3-us-west-1.amazonaws.com/video/video.mp4 -f mp4 -movflags frag_keyframe+empty_moov pipe:1 | aws s3 cp - s3://notreal-bucket/video/output.mp4

    



    Link of the file : https://happy-testing.s3-eu-west-1.amazonaws.com/stack-overflow/help.mp4

    


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