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Autres articles (13)

  • Librairies et logiciels spécifiques aux médias

    10 décembre 2010, par

    Pour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
    Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel ; FFMpeg avec le maximum de décodeurs et (...)

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Configuration spécifique d’Apache

    4 février 2011, par

    Modules spécifiques
    Pour la configuration d’Apache, il est conseillé d’activer certains modules non spécifiques à MediaSPIP, mais permettant d’améliorer les performances : mod_deflate et mod_headers pour compresser automatiquement via Apache les pages. Cf ce tutoriel ; mode_expires pour gérer correctement l’expiration des hits. Cf ce tutoriel ;
    Il est également conseillé d’ajouter la prise en charge par apache du mime-type pour les fichiers WebM comme indiqué dans ce tutoriel.
    Création d’un (...)

Sur d’autres sites (4613)

  • image overlay with ffmpeg runs the script indefinitely

    25 mai 2015, par kprotocol

    I really tried hard, I did not succeed, so I am asking here. I wanted to have an overlay image (jpg) with text on video (mp4 ; 15 secs) and have fade-in and fade-out for the overlayed image (and not the video). I could do this with the follwing command, but it hangs after after reaching 451 frames. After this the "drop" (shown in the output ; drop=1451) starts increasing and the process never finishes.

    ffmpeg -i video.mp4 -loop 1 -i overlay.jpg -filter_complex \
    
"[1] drawtext=fontfile=$fontfile:text='TESTING TEXT':fontcolor=white@1.0:fontsize=46:x=0:y=0 [t0]; 
    
[t0] fade=in:st=0:d=3 [t1]; 
    
[0][t1] overlay=0:900:enable='between(t,0,15)'" \
    
-codec:a copy output.mp4
    

    
Output:
    
frame=  451 fps=8.8 q=-1.0 Lsize=    4790kB time=00:00:14.98 bitrate=2619.0kbits/s dup=75 drop=1451

    Please help.
    Thanks.

  • lavc/qsv : extactly map profile

    28 avril 2019, par Zhong Li
    lavc/qsv : extactly map profile

    Currently profile mapping is hard-coded, and not flexible to do extactly
    
map (E.g : libmfx treats H264 constrained baseline to be baseline profile).
    

    vaapi profile mapping funtion provides a better soultion than current
    
qsv mapping.
    

    Signed-off-by : Zhong Li <zhong.li@intel.com>
    • [DH] libavcodec/qsv.c

  • Tell libavcodec/ffmpeg to drop frame

    7 mars 2013, par chouquette

    I'm building an app in which I create a video.
    Problem is, sometime (well... most of the time) the frame acquisition process isn't quick enough.

    What I'm currently doing is to skip the current frame acquisition if I'm late, however FFMPEG/libavcodec considers every frame I pass to it as the next frame in line, so If I drop 1 out of 2 frames, a 20seconds video will only last 10. More problems come in as soon as I add sound, since sound processing is way faster...

    What I'd like would be to tell FFMPEG : "last frame should last twice longer that originally intended", or anything that could allow me to process in real time.

    I tried to stack the frames at a point, but this ends up killing all my memory (I also tried to 'stack' my frames in the hard drive, which was way to slow, as I expected)

    I guess I'll have to work with the pts manually, but all my attempts have failed, and reading some other apps code which use ffmpeg, such as VLC, wasn't of a great help... so any advice would be much appreciated !

    Thanks a lot in advance !

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