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Autres articles (96)

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

  • 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 (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

Sur d’autres sites (5451)

  • Crash in ffmpeg avcodec_free_context in one application but not in other

    5 novembre 2017, par geekowl

    I am building an application in C++ on Windows 10 using Microsoft Visual Studio 2012 Professional.

    I have created a wrapper library around ffmpeg (libavcodec) to encode video in H.264 format using libx264. This wrapper contains following functions :

    Initialize()
    
Open()
    
EncodeFrame()
    
Close()
    
Uninitialize()

    I created a test application to test the wrapper library. The test application works perfectly fine.

    When I use the wrapper library in my actual main application, the main application crashes in Close() API. Inside close, it crashes in avcodec_free_context(). The difference between the main application and the test application is that the main application links with some more dependent libraries that test application does not link with.

    To debug the problem in the main application, I put avcodec_free_context() in Open() after the context is allocated. The crash occurs if avcodec_free_context() is put at a certain point as shown below.

    pCodecContext = avcodec_alloc_context3(pCodec);
    

    
// <---- No crash here.
    

    
pCodecContext->bit_rate = 200000;
    
pCodecContext->width = 320;
    
pCodecContext->height = 240;
    
.
    
.
    
.
    
if (pCodec->id == AV_CODEC_ID_H264)
    
{
    
    av_opt_set(pCodecContext->priv_data, "preset", "slow", 0);
    
    av_opt_set(pCodecContext->priv_data, "tune", "zerolatency", 0);
    
}
    

    
pCodecContext->flags |= CODEC_FLAG_GLOBAL_HEADER;
    

    
// <-- No crash here
    

    
if (avcodec_open2(pCodecContext, pCodec, NULL) < 0)
    
{
    
    return -1;
    
}
    

    
// <-- Crash here [avcodec_free_context(&pCodecContext);]

    What is a correct approach to identify and resolve this problem ?

    Thanks in advance.

    Update

    I found out that ffmpeg was built using gcc. That was causing the crash. I rebuilt ffmpeg using Visual Studio. That solved problem.

  • Adding Color Flags with ffmpeg

    29 juillet 2017, par user3534226

    If I have a video which lacks color space flags, specifically :

    Color primaries

    Transfer characteristics

    Matrix coefficients

    can I use ffmpeg to add these flags without re-encoding the entire video ?

    Thank you.

  • avformat/mpegts : only clear programs which no longer exist or have a new PMT

    27 décembre 2020, par Marton Balint
    avformat/mpegts : only clear programs which no longer exist or have a new PMT

    Otherwise there can be a small period when the programs only contain the PMT
    
pid.
    

    Also make sure skip_clear only affects AVProgram clear, and that pmt_pid is
    
always kept as the first entry of the PID list of the programs. Also reject
    
PMTs for programs on the wrong PID.
    

    Signed-off-by : Marton Balint <cus@passwd.hu>
    • [DH] libavformat/mpegts.c

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