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  • 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.

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

Sur d’autres sites (5334)

  • FFMPEG - Scale video filter not providing expected results

    11 novembre 2011, par dpassera

    Apologies if this question has been asked. I couldn't find it, but if it has, please let me know and I'll close this out.

    I'm attempting a simple scale of a video whose original dimensions are 480x360 and whose target dimensions are 400x300. The video starts as an FLV and eventually needs to end up as an MPEG. I'm using the following command line to do this :

    ffmpeg -i user.flv -vf "scale=400:300" user_scaled.mpg

    When I play the scaled video in MPEG Streamclip, the scale is correct and the video info shows that the dimensions are 400x300. However, when I play the scaled video in Quicktime, the video is scaled to 478x359. More importantly, FFMPEG, itself, treats the video as being 478x359, so any future commands (trimming, conversion, overlaying, etc) executed on it result in a video of 478x359.

    The initial workflow required an FLV to MPEG conversion, but I've tried this with several different in and out formats (FLV -> FLV, FLV -> MPEG, MPEG -> MPEG, etc) all with the same results. As long as I can end up with an MPEG, though, I can deal with however many steps and conversions it would take to get this scaling working.

    I'll paste the command-line output below, and a sample input video is also linked below, if you'd like it. Thank you very much for any help.

    http://www.monkeydriver.com/dpassera/stack_flv.zip

    Command-line output :

    ffmpeg -i user.flv -vf "scale=400:300" user_scaled.mpg

    ffmpeg version 0.7-rc1, Copyright (c) 2000-2011 the FFmpeg developers
     built on May 21 2011 22:13:19 with gcc 4.1.2 20080704 (Red Hat 4.1.2-50)
     configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64
    --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth
    --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
    -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC'
    --enable-avfilter --enable-libdirac --enable-libgsm --enable-libmp3lame
    --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264
    --enable-gpl --enable-postproc --enable-pthreads --enable-shared
    --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
    --disable-yasm --enable-filters --enable-filter=movie

     libavutil    50. 40. 1 / 50. 40. 1
     libavcodec   52.120. 0 / 52.120. 0
     libavformat  52.108. 0 / 52.108. 0
     libavdevice  52.  4. 0 / 52.  4. 0
     libavfilter   1. 77. 0 /  1. 77. 0
     libswscale    0. 13. 0 /  0. 13. 0
     libpostproc  51.  2. 0 / 51.  2. 0

    [flv @ 0x11dd3b30] Estimating duration from bitrate, this may be inaccurate
    Input #0, flv, from 'user.flv':

     Metadata:
       duration        : 5
       videocodecid    : 2
       audiocodecid    : 6
       canSeekToEnd    : true
       createdby       : FMS 4.0
       creationdate    : Mon Oct 31 11:43:44 2011

     Duration: 00:00:04.62, start: 0.000000, bitrate: N/A
       Stream #0.0: Video: flv, yuv420p, 640x480, 1k tbr, 1k tbn, 1k tbc
       Stream #0.1: Audio: nellymoser, 44100 Hz, mono, s16

    [buffer @ 0x11ddc950] w:640 h:480 pixfmt:yuv420p

    [scale @ 0x11dda610] w:640 h:480 fmt:yuv420p -> w:400 h:300 fmt:yuv420p flags:0xa0000004

    [mpeg @ 0x11dd6bd0] VBV buffer size not set, muxing may fail

    Output #0, mpeg, to 'user_scaled.mpg':
     Metadata:
       duration        : 5
       videocodecid    : 2
       audiocodecid    : 6
       canSeekToEnd    : true
       createdby       : FMS 4.0
       creationdate    : Mon Oct 31 11:43:44 2011
       encoder         : Lavf52.108.0

       Stream #0.0: Video: mpeg1video, yuv420p, 400x300, q=2-31, 200 kb/s, 90k tbn, 60 tbc

       Stream #0.1: Audio: mp2, 44100 Hz, mono, s16, 64 kb/s

    Stream mapping:
    Stream #0.0 -> #0.0
    Stream #0.1 -> #0.1

    Press [q] to stop encoding
    frame=  230 fps=  0 q=10.2 size=     366kB time=3.82 bitrate= 785.6kbits/s dup=175 drop=0
    frame=  267 fps=  0 q=10.7 Lsize=     412kB time=4.43 bitrate= 761.3kbits/s dup=203 drop=0    

    video:370kB audio:36kB global headers:0kB muxing overhead 1.568959%
  • Increase maximum encoding video buffer size.

    14 janvier 2012, par Carl Eugen Hoyos

    Increase maximum encoding video buffer size.

  • ffmpeg c api for cutting video

    13 janvier 2012, par user1148080

    first thing sorry for my bad english, i'm making an android app that need to get part of a video, the idea is i need a method that get input a video file, start-time, end-time then cutting video from star-time to end-time and output to a new file, i get ffmpeg for android from http://bambuser.com/opensource and able to compile it, integrate with JNI, but now i dont know which ffmpeg's api to use for do the thing a need, any help, example are much appreciated.