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Autres articles (44)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

Sur d’autres sites (4484)

  • Revision 16878 : do not try to get aspect information from source twice in twopass ...

    7 février 2010, par j — Log

    do not try to get aspect information from source twice in twopass mode, fixes bug reported by DuClare ?

  • FFmpeg output video file much smaller than uncompressed input audio file, using option to preserve original audio quality

    17 mars 2021, par Jan

    I attempt to create a video slideshow from a number of image files and an audio file in 2 steps :

    


      

    1. Create a temporary video file from a sequence of image files

      2. 


    2. Add an audio file to the temporary video file with a delay of 5 seconds

      3. 


    


    The audio file is an uncompressed stereo wav file, encoded with a sample rate of 44100 Hz and a bit depth of 32 bits, with a size of 40.1 MB. To preserve the lossless quality of the input audio file I use the option -c:a aac -b:a 192k as per Slideshow Wiki. However, the final output video file has a size of only 4.49 MB.

    


    How can the output video file be about 10 times smaller than the input audio file and still preserve the original lossless quality ?

    


    My code :

    


    ffmpeg -f concat -i slide-sequence.txt -c:v libx264 -r 30 -filter_complex format=yuv420p temp.mp4
ffmpeg -i temp.mp4 -i audio.wav -af "adelay=5000|5000" -c:v copy -c:a aac -b:a 192k out.mp4


    


  • How to use FFmpeg(v 4.0) HwAccell in Android

    21 novembre 2018, par 심상원

    I’m making an app that uses FFmpeg on Android to show the screen.

    I have a few questions to ask you.

    std::vector <avhwdevicetype> GetSupportHwDeviceType ()
    
{
    
    unsigned int idx {};
    
    std::vector <avhwdevicetype> hwDevTypes;
    

    
    AVHWDeviceType hwDevType = AVHWDeviceType::AV_HWDEVICE_TYPE_NONE;
    
    while ((hwDevType = av_hwdevice_iterate_types (hwDevType)) ! = AVHWDeviceType::AV_HWDEVICE_TYPE_NONE)
    
    {
    
        __android_log_print (ANDROID_LOG_DEBUG, __func__, "[Index% d]", idx ++);
    
        __android_log_print (ANDROID_LOG_DEBUG, __func__,
    
                        "[Support Device Name% s]", av_hwdevice_get_type_name (hwDevType));
    

    
        hwDevTypes.push_back (hwDevType);
    
    }
    

    
    return hwDevTypes;
    
}
    
</avhwdevicetype></avhwdevicetype>

    I would like to use hardware acceleration with the above function, and as a result I could not find any type.

    At https://trac.ffmpeg.org/wiki/HWAccelIntro, it says that Android can use MediaCodec. Why can not I retrieve any type from Android NDK with GetSupportHwDeviceType () ?

    The Configure argument used while building FFmpeg for Android.

    --disable-asm
    
--enable-cross-comile
    
--disable-static
    
--disable-programs
    
--disable-doc
    
--enable-shared
    
--enable-protocol=file
    
--enable-pic
    
--enable-small
    
--enable-mediacodec
    
--enable-jni
    
--enable-decoder=h264_mediacodec
    
--enable-opengl
    

    
/* The argument was not supported by ./configure --list-hwaccel in FFmpeg v4.0.3. */
    

    
--enable-hwaccel=h264_mediacodec

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