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Médias (3)

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Autres articles (35)

  • 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) (...)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

Sur d’autres sites (5303)

  • lavc : add sample rate and channel layout to AVFrame.

    4 mai 2012, par Anton Khirnov

    lavc : add sample rate and channel layout to AVFrame.

  • avplay : use libavresample for sample format conversion and channel mixing

    25 avril 2012, par Justin Ruggles

    avplay : use libavresample for sample format conversion and channel mixing

  • Convert .mov to .mp4 and keep alpha channel using FFMPEG

    5 mai 2015, par Mark S.

    I am trying to convert a .mov file that is Quicktime with Alpha Channel to a .mp4 movie. I am using FFMPEG and I can successfully convert the video to a .mp4 video, but I loose the alpha channel.

    Here is the command I am running :
    ffmpeg -i BLUE_LOWER_THIRD.mov -vcodec libx264 -vpre medium blue_lower_third.mp4

    I am running this on Ubuntu 11.10. Here is the information about my install of ffmpeg.

    ffmpeg version 0.7.3-4:0.7.3-0ubuntu0.11.10.1, Copyright (c) 2000-2011 the Libav developers
    
  built on Jan  4 2012 16:08:51 with gcc 4.6.1
    
  configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=amd64 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
    
  avutil      configuration: --extra-version='4:0.7.3ubuntu0.11.10.1' --arch=amd64 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --enable-shared --disable-static
    
  avcodec     configuration: --extra-version='4:0.7.3ubuntu0.11.10.1' --arch=amd64 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --enable-shared --disable-static
    
  avformat    configuration: --extra-version='4:0.7.3ubuntu0.11.10.1' --arch=amd64 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --enable-shared --disable-static
    
  libavutil    51.  7. 0 / 51.  7. 0
    
  libavcodec   53.  6. 0 / 53.  6. 0
    
  libavformat  53.  3. 0 / 53.  3. 0
    
  libavdevice  53.  0. 0 / 53.  0. 0
    
  libavfilter   2.  4. 0 /  2.  4. 0
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  52.  0. 0 / 52.  0. 0

    Is it possible to have alpha channel in an mp4 file ? If so, how do you do it with FFMPEG ?

    Edit : This is the output from running the command.

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'BLUE_LOWER_THIRD.mov':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    creation_time   : 2010-12-21 10:36:51
    
  Duration: 00:00:15.00, start: 0.000000, bitrate: 8050 kb/s
    
    Stream #0.0(eng): Video: png, bgra, 1920x1080, 8043 kb/s, PAR 1920:1920 DAR 16:9, 30 fps, 30 tbr, 30 tbn, 30 tbc
    
    Metadata:
    
      creation_time   : 2010-12-21 10:36:51
    
    Stream #0.1(eng): Data: tmcd / 0x64636D74, 0 kb/s
    
    Metadata:
    
      creation_time   : 2010-12-21 10:39:48
    
File 'blue_lower_third.mp4' already exists. Overwrite ? [y/N] y
    
Incompatible pixel format 'bgra' for codec 'libx264', auto-selecting format 'yuv420p'
    
[buffer @ 0x7e3d80] w:1920 h:1080 pixfmt:bgra
    
[ffsink @ 0x7edda0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
    
[scale @ 0x7fc480] w:1920 h:1080 fmt:bgra -> w:1920 h:1080 fmt:yuv420p flags:0x4
    
[libx264 @ 0x7fcf20] using SAR=1/1
    
[libx264 @ 0x7fcf20] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle Cache64
    
[libx264 @ 0x7fcf20] profile High, level 4.0
    
[libx264 @ 0x7fcf20] 264 - core 116 r2042 178455c - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=200 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.41 aq=1:1.00
    
Output #0, mp4, to 'blue_lower_third.mp4':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    creation_time   : 2010-12-21 10:36:51
    
    encoder         : Lavf53.3.0
    
    Stream #0.0(eng): Video: libx264, yuv420p, 1920x1080 [PAR 1920:1920 DAR 16:9], q=0-69, 200 kb/s, 30 tbn, 30 tbc
    
    Metadata:
    
      creation_time   : 2010-12-21 10:36:51
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press ctrl-c to stop encoding
    
frame=  450 fps= 11 q=9.0 Lsize=      83kB time=14.93 bitrate=  45.7kbits/s    its/s    
    
video:75kB audio:0kB global headers:0kB muxing overhead 10.287784%
    
frame I:2     Avg QP:18.30  size:  2584
    
[libx264 @ 0x7fcf20] frame P:118   Avg QP:16.22  size:   310
    
[libx264 @ 0x7fcf20] frame B:330   Avg QP:16.75  size:   106
    
[libx264 @ 0x7fcf20] consecutive B-frames:  1.8%  0.9%  1.3% 96.0%
    
[libx264 @ 0x7fcf20] mb I  I16..4: 49.7% 50.0%  0.3%
    
[libx264 @ 0x7fcf20] mb P  I16..4:  0.5%  0.0%  0.0%  P16..4:  0.3%  0.0%  0.0%  0.0%      0.0%    skip:99.0%
    
[libx264 @ 0x7fcf20] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.3%  0.0%  0.0%  direct: 0.0%  skip:99.6%  L0:37.2% L1:62.6% BI: 0.2%
    
[libx264 @ 0x7fcf20] final ratefactor: 9.32
    
[libx264 @ 0x7fcf20] 8x8 transform intra:38.0% inter:56.1%
    
[libx264 @ 0x7fcf20] coded y,uvDC,uvAC intra: 0.9% 4.2% 2.9% inter: 0.0% 0.1% 0.0%
    
[libx264 @ 0x7fcf20] i16 v,h,dc,p: 64% 32%  1%  3%
    
[libx264 @ 0x7fcf20] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  0%  2% 97%  0%  1%  0%  0%  0%  0%
    
[libx264 @ 0x7fcf20] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  5% 60% 23%  2%  6%  1%  1%  1%  2%
    
[libx264 @ 0x7fcf20] i8c dc,h,v,p: 86% 13%  1%  0%
    
[libx264 @ 0x7fcf20] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0x7fcf20] ref P L0: 79.4%  2.1% 13.2%  5.2%
    
[libx264 @ 0x7fcf20] ref B L0: 61.1% 37.7%  1.2%
    
[libx264 @ 0x7fcf20] ref B L1: 92.3%  7.7%
    
[libx264 @ 0x7fcf20] kb/s:40.85

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