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  • L’espace de configuration de MediaSPIP

    29 novembre 2010, par

    L’espace de configuration de MediaSPIP est réservé aux administrateurs. Un lien de menu "administrer" est généralement affiché en haut de la page [1].
    Il permet de configurer finement votre site.
    La navigation de cet espace de configuration est divisé en trois parties : la configuration générale du site qui permet notamment de modifier : les informations principales concernant le site (...)

  • Déploiements possibles

    31 janvier 2010, par

    Deux types de déploiements sont envisageable dépendant de deux aspects : La méthode d’installation envisagée (en standalone ou en ferme) ; Le nombre d’encodages journaliers et la fréquentation envisagés ;
    L’encodage de vidéos est un processus lourd consommant énormément de ressources système (CPU et RAM), il est nécessaire de prendre tout cela en considération. Ce système n’est donc possible que sur un ou plusieurs serveurs dédiés.
    Version mono serveur
    La version mono serveur consiste à n’utiliser qu’une (...)

  • 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 (...)

Sur d’autres sites (5680)

  • encoding using ffmpeg for mac app

    9 mai 2012, par user946061

    In my mac app i am using ffmpeg library for video encoding in 4 different types of formats for iPhone, iPod, AppleTV and HD.But the encoding takes so much time and the CPU usage becomes very low.I want someone to get me any idea to maximize this CPU usage and minimize the encoding time-period so that the application may enhance the performance level.

  • Rotating videos with FFmpeg

    19 février 2016, par jocull

    I have been trying to figure out how to rotate videos with FFmpeg. I am working with iPhone videos taken in portrait mode. I know how to determine the current degrees of rotation using MediaInfo (excellent library, btw) but I’m stuck on FFmpeg now.

    From what I’ve read, what you need to use is a vfilter option. According to what I see, it should look like this :

    ffmpeg -vfilters "rotate=90" -i input.mp4 output.mp4

    However, I can’t get this to work. First, -vfilters doesn’t exist anymore, it’s now just -vf. Second, I get this error :

    No such filter: 'rotate'
    
Error opening filters!

    As far as I know, I have an all-options-on build of FFmpeg. Running ffmpeg -filters shows this :

    Filters:
    
anull            Pass the source unchanged to the output.
    
aspect           Set the frame aspect ratio.
    
crop             Crop the input video to x:y:width:height.
    
fifo             Buffer input images and send them when they are requested.
    
format           Convert the input video to one of the specified pixel formats.
    
hflip            Horizontally flip the input video.
    
noformat         Force libavfilter not to use any of the specified pixel formats
    
 for the input to the next filter.
    
null             Pass the source unchanged to the output.
    
pad              Pad input image to width:height[:x:y[:color]] (default x and y:
    
 0, default color: black).
    
pixdesctest      Test pixel format definitions.
    
pixelaspect      Set the pixel aspect ratio.
    
scale            Scale the input video to width:height size and/or convert the i
    
mage format.
    
slicify          Pass the images of input video on to next video filter as multi
    
ple slices.
    
unsharp          Sharpen or blur the input video.
    
vflip            Flip the input video vertically.
    
buffer           Buffer video frames, and make them accessible to the filterchai
    
n.
    
color            Provide an uniformly colored input, syntax is: [color[:size[:ra
    
te]]]
    
nullsrc          Null video source, never return images.
    
nullsink         Do absolutely nothing with the input video.

    Having the options for vflip and hflip are great and all, but they just won’t get me where I need to go. I need to the ability to rotate videos 90 degrees at the very least. 270 degrees would be an excellent option to have as well. Where have the rotate options gone ?

  • FFmpeg decoding H264

    25 septembre 2011, par Steve McFarlin

    I am decoding a H264 stream using FFmpeg on the iPhone. I know the H264 stream is valid and the SPS/PPS are correct as VLC, Quicktime, Flash all decode the stream properly. The issue I am having on the iPhone is best shown by this picture.

    enter image description here

    It is as if the motion vectors are being drawn. This picture was snapped while there was a lot of motion in the image. If the scene is static then there are dots in the corners. This always occurs with predictive frames. The blocky colors are also an issue.

    I have tried various build settings for FFmpeg such as turning off optimizations, asm, neon, and many other combinations. Nothing seems to alter the behavior of the decoder. I have also tried the Works with HTML, Love and Peace releases, and also the latest GIT sources. Is there maybe a setting I am missing, or maybe I have inadvertently enabled some debug setting in the decoder.

    Edit

    I am using sws_scale to convert the image to RGBA. I have tried various different pixel formats with the same results.

    sws_scale(convertCtx, (const uint8_t**)srcFrame->data, srcFrame->linesize, 0, codecCtx->height, dstFrame->data, dstFrame->linesize);

    I am using PIX_FMT_YUV420P as the source format when setting up my codec context.

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