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  • Demande de création d’un canal

    12 mars 2010, par

    En fonction de la configuration de la plateforme, l’utilisateur peu avoir à sa disposition deux méthodes différentes de demande de création de canal. La première est au moment de son inscription, la seconde, après son inscription en remplissant un formulaire de demande.
    Les deux manières demandent les mêmes choses fonctionnent à peu près de la même manière, le futur utilisateur doit remplir une série de champ de formulaire permettant tout d’abord aux administrateurs d’avoir des informations quant à (...)

  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

Sur d’autres sites (4433)

  • pthread_frame : do not copy a range of AVCodecContext fields at once

    15 janvier 2017, par Anton Khirnov
    pthread_frame : do not copy a range of AVCodecContext fields at once

    This is extremely fragile against reordering and hides what is actually
    
being copied. Copy all the fields manually instead.
    • [DH] libavcodec/pthread_frame.c

  • Incorrect values for song length (duration) in Mp3tag after ffmpeg FLAC to MP3 conversion

    29 mars 2024, par Clueless

    The problem

    


    As per this post, I use the following command to convert a flac file to mp3 while keeping all metadata :

    


    ffmpeg -i input.flac -ab 320k -map_metadata 0 -id3v2_version 3 output.mp3


    


    When inspecting the converted mp3 file by right-clicking it, going to properties and then details, everything looks in order. The value for "Length" is correct.

    


    enter image description here

    


    When inspecting the converted mp3 file with Mp3tag, the value for "Length" is different. From my testing, the "Length" value is consistently about 28% of what it is supposed to be.

    


    enter image description here

    


    Normally, this isn't an issue. Most music players I use, read the correct length value, same as Windows. However, I've recently discovered that Spotify Mobile for some reason ignores the length value that can be seen in the Windows panel and uses the one that can be seen in Mp3tag.

    


    I want to figure out what command I should use so that after the flac file has been converted to mp3, Mp3tag shows the correct length, and there by, Spotify Mobile reads the correct length as well.

    


    What I have tried

    


    1.
After converting the file to Mp3, I've tried reencoding the mp3 file into a... mp3 file using the following command :

    


    ffmpeg -i original.mp3 -c:v copy -c:a mp3 -vn -ar 44100 -ac 2 -b:a 320k copy.mp3


    


    enter image description here

    


    As can be seen in the image above, this fixes the issue and the length is showing correctly in Mp3tag and in Spotify Mobile.

    


    Issues with this : Reencoding reduces quality and I don't know how to combine the previous flac conversion command and this one into one line.

    


    2.
I tried https://cloudconvert.com/flac-to-mp3 and it worked. The length is displayed correctly in Mp3tag. (What commands did they use on the server ???)

    


    enter image description here

    


    Issues with this : I don't want to rely on a cloud service for conversion, I have a lot of files to convert and I'd prefer it to be done locally.

    


    Some demo files

    


    Here is a folder with a flac file, a bad mp3 file (wrong length) and a good mp3 file. It looks like if you preview the music in google drive, it also plays the wrong length for the bad mp3 (39s not 2m19s), while vlc, groove player, spotify (desktop not mobile) all play the correct full length (2m19s) for the bad mp3 file.

    


    Folder : here's the link

    


  • fftools/ffmpeg_filter : configure buffersrc with csp/range

    20 octobre 2023, par Niklas Haas
    fftools/ffmpeg_filter : configure buffersrc with csp/range

    Propagates input metadata to the input filter graph.
    • [DH] fftools/ffmpeg_filter.c

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