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  • Pas question de marché, de cloud etc...

    10 avril 2011

    Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
    sur le web 2.0 et dans les entreprises qui en vivent.
    Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
    Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
    le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
    Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...)

  • 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 (...)

  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

Sur d’autres sites (4832)

  • libavcodec/alpha : remove DSP & support code

    9 juin 2024, par Sean McGovern
    libavcodec/alpha : remove DSP & support code

    Introduced in 1992, the Alpha was a 64-bit RISC processor designed
    
to replace the VAX CISC machines sold by Digital Equipment Corporation.
    

    After Digital was acquired by Compaq in 1998 — who themselves would be
    
later purchased by Hewlett-Packard, the architecture was phased out over
    
the following decade. It became effectively defunct in 2007, the last
    
publicly available processor being the Alpha 21364.
    

    FFmpeg has not added any DSP code for this architecture since lowres2
    
was introduced in 2012, and it is more than unlikely someone still wishes
    
to maintain it.
    

    Remove the DSP and support code.
    

    Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
    • [DH] Changelog
    • [DH] configure
    • [DH] libavcodec/alpha/Makefile
    • [DH] libavcodec/alpha/asm.h
    • [DH] libavcodec/alpha/blockdsp_alpha.c
    • [DH] libavcodec/alpha/hpeldsp_alpha.c
    • [DH] libavcodec/alpha/hpeldsp_alpha.h
    • [DH] libavcodec/alpha/hpeldsp_alpha_asm.S
    • [DH] libavcodec/alpha/idctdsp_alpha.c
    • [DH] libavcodec/alpha/idctdsp_alpha.h
    • [DH] libavcodec/alpha/idctdsp_alpha_asm.S
    • [DH] libavcodec/alpha/me_cmp_alpha.c
    • [DH] libavcodec/alpha/me_cmp_mvi_asm.S
    • [DH] libavcodec/alpha/mpegvideo_alpha.c
    • [DH] libavcodec/alpha/pixblockdsp_alpha.c
    • [DH] libavcodec/alpha/regdef.h
    • [DH] libavcodec/alpha/simple_idct_alpha.c
    • [DH] libavcodec/blockdsp.c
    • [DH] libavcodec/hpeldsp.c
    • [DH] libavcodec/idctdsp.c
    • [DH] libavcodec/me_cmp.c
    • [DH] libavcodec/mpegvideo.c
    • [DH] libavcodec/pixblockdsp.c

  • ffmpeg - Record Server Desktop Without Connection

    21 janvier, par chrisp

    I set up an application which uses ffmpeg to record a desktop on an Amazon AWS EC2 instance having Windows Server 2012 R2 installed. It records the desktop and puts the result into a file.

    &#xA;&#xA;

    This works as long as a Remote Desktop or TeamViewer connection is active for that particular Amazon AWS EC2 instance. As soon as I close the Remote Desktop and TeamViewer connection the recording stops and continues as soon as I reconnect.

    &#xA;&#xA;

    I assume that it's because the GPU doesn't deliver frames without a display in use.

    &#xA;&#xA;

    How can I make sure that frames are constantly being rendered so that I can record them ?

    &#xA;

  • ffmpeg not setting GOP size for x264

    5 juillet 2012, par Chris Robinson

    Can someone please explain to me why the following settings :

    ffmpeg -i test.avi -vcodec libx264 -g 2 -keyint_min 1 -sc_threshold 100000000 -bf 1 test.mp4

    produces the following output :

    ffmpeg version N-41668-g564bb24 Copyright (c) 2000-2012 the FFmpeg developers
    
built on Jun 17 2012 20:18:05 with gcc 4.6.3
    
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --ena  libavutil      51. 58.100 / 51. 58.100
    
  libavcodec     54. 25.100 / 54. 25.100
    
  libavformat    54.  6.101 / 54.  6.101
    
  libavdevice    54.  0.100 / 54.  0.100
    
  libavfilter     2. 81.100 /  2. 81.100
    
  libswscale      2.  1.100 /  2.  1.100
    
  libswresample   0. 15.100 /  0. 15.100
    
  libpostproc    52.  0.100 / 52.  0.100
    
Input #0, avi, from &#39;test.avi&#39;:
    
  Metadata:
    
    encoder         : Lavf54.6.101
    
  Duration: 00:00:01.70, start: 0.000000, bitrate: 4258 kb/s
    
Stream #0:0: Video: mpeg4 (Simple Profile) (DIVX / 0x58564944), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc
    
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16, 128 kb/s
    
[buffer @ 0000000004115600] w:1280 h:720 pixfmt:yuv420p tb:1001/30000 fr:30000/1001 sar:1/1 sws_param:flags=2
    
[ffmpeg_buffersink @ 00000000041157a0] No opaque field provided
    
[libx264 @ 000000000411f120] using SAR=1/1
    
[libx264 @ 000000000411f120] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
    
[libx264 @ 000000000411f120] profile High, level 3.1
    
[libx264 @ 000000000411f120] 264 - core 125 r2200 999b753 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - 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=36 lookahead_threads=6 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 keOutput #0, mp4, to &#39;test.mp4&#39;:
    
  Metadata:
    
    encoder         : Lavf54.6.101
    
    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 30k tbn, 29.97 tbc
    
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg4 -> libx264)
    
  Stream #0:1 -> #0:1 (mp3 -> libvo_aacenc)
    
Press [q] to stop, [?] for help
    
[libvo_aacenc @ 0000000001ebe240] Que input is backward in time
    
Last message repeated 8 times
    
frame=   35 fps=0.0 q=-1.0 Lsize=     466kB time=00:00:01.10 bitrate=3466.6kbits/s dup=1 drop=0    
    

    
video:436kB audio:28kB global headers:0kB muxing overhead 0.558509%
    
[libx264 @ 000000000411f120] frame I:1     Avg QP:24.93  size: 92398
    
[libx264 @ 000000000411f120] frame P:28    Avg QP:26.82  size: 12010
    
[libx264 @ 000000000411f120] frame B:6     Avg QP:30.37  size:  2764
    
[libx264 @ 000000000411f120] consecutive B-frames: 74.3%  5.7%  8.6% 11.4%
    
[libx264 @ 000000000411f120] mb I  I16..4: 41.5% 40.1% 18.4%
    
[libx264 @ 000000000411f120] mb P  I16..4:  3.9%  1.4%  0.6%  P16..4: 14.3%  4.7%  3.2%  0.0%  0.0%    skip:72.0%
    
[libx264 @ 000000000411f120] mb B  I16..4:  1.1%  0.4%  0.1%  B16..8: 14.2%  2.8%  0.6%  direct: 1.1%  skip:79.8%  L0:49.8% L1:39.5% BI:10.8%
    
[libx264 @ 000000000411f120] 8x8 transform intra:29.9% inter:76.4%
    
[libx264 @ 000000000411f120] coded y,uvDC,uvAC intra: 31.1% 34.4% 18.7% inter: 10.2% 6.3% 3.0%
    
[libx264 @ 000000000411f120] i16 v,h,dc,p: 62% 34%  3%  0%
    
[libx264 @ 000000000411f120] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 23% 38%  4%  4%  3%  3%  2%  5%
    
[libx264 @ 000000000411f120] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40% 35% 16%  1%  2%  2%  1%  1%  1%
    
[libx264 @ 000000000411f120] i8c dc,h,v,p: 52% 20% 24%  3%
    
[libx264 @ 000000000411f120] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 000000000411f120] ref P L0: 70.5% 10.1% 12.1%  7.3%
    
[libx264 @ 000000000411f120] ref B L0: 81.1% 16.9%  2.0%
    
[libx264 @ 000000000411f120] ref B L1: 89.7% 10.3%
    
[libx264 @ 000000000411f120] kb/s:3050.18

    Why am I not getting an I-Frame every second frame ? Is there something else I can set to do enforce this ? If not, can you suggest how to do this using the mpeg4 codec. It's vital that I can extract what type of frame has been encoded during the encoding process and that I can set a specific GOP structure.

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