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  • Qu’est ce qu’un éditorial

    21 juin 2013, par

    Ecrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
    Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
    Vous pouvez personnaliser le formulaire de création d’un éditorial.
    Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

  • 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) (...)

Sur d’autres sites (6406)

  • What is the best way to capture a screenshot from a udp stream ?

    8 novembre 2017, par yash17

    I’m trying to capture a screenshot from a udp stream using ffmpeg in a Ubuntu 14.04 System.
    Following is the command

    ffmpeg -y -i udp_ip -vframes 1 -q:v 1 test.png

    But the image captured is of very poor resolution and I observed a lag while taking the screenshot.

    Please suggest a best tool or a way to take a screenshot in the fastest way and also of the best image resolution possible.

    edit :
    log files

    ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
    
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libtheora --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
    
  libavutil      55. 58.100 / 55. 58.100
    
  libavcodec     57. 89.100 / 57. 89.100
    
  libavformat    57. 71.100 / 57. 71.100
    
  libavdevice    57.  6.100 / 57.  6.100
    
  libavfilter     6. 82.100 /  6. 82.100
    
  libavresample   3.  5.  0 /  3.  5.  0
    
  libswscale      4.  6.100 /  4.  6.100
    
  libswresample   2.  7.100 /  2.  7.100
    
  libpostproc    54.  5.100 / 54.  5.100
    
[mpeg2video @ 0x390cc60] Invalid frame dimensions 0x0.
    
    Last message repeated 7 times
    
Input #0, mpegts, from 'udp://@xxx.xx.xx.xx:xxxx':
    
  Duration: N/A, start: 144.130744, bitrate: 4128 kb/s
    
  Program 1 
    
    Metadata:
    
      service_name    : Program-1   
    
      service_provider: Encoder 
    
    Stream #0:0[0x42]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 16:15 DAR 4:3], 4000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    
    Stream #0:1[0x43]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video (native) -> png (native))
    
Press [q] to stop, [?] for help
    
Output #0, image2, to 'player.png':
    
  Metadata:
    
    encoder         : Lavf57.71.100
    
    Stream #0:0: Video: png, rgb24, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    
    Metadata:
    
      encoder         : Lavc57.89.100 png
    
frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1 drop=1 speed=0.729x    
    
video:777kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  • What is the best way to capture a screenshot from a udp multicast stream ? [on hold]

    30 novembre 2017, par yash17

    Currently I’m capturing screenshot from an UDP multicast stream, playing in VLC,using ffmpeg from command line.

    Is there any other tool that can capture the screenshot,with best resolution ?

    edit :
    ffmpeg takes more 3 seconds to capture the screen.Mentioned Below is the log for the same.And I came to know that for streaming,ffmpeg can’t be faster.
    So is there any alternate way,that will help me capture screen instantaneously.

    log :

    ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
    
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
    
configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libtheora --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
    
libavutil      55. 58.100 / 55. 58.100
    
libavcodec     57. 89.100 / 57. 89.100
    
libavformat    57. 71.100 / 57. 71.100
    
libavdevice    57.  6.100 / 57.  6.100
    
libavfilter     6. 82.100 /  6. 82.100
    
libavresample   3.  5.  0 /  3.  5.  0
    
libswscale      4.  6.100 /  4.  6.100
    
libswresample   2.  7.100 /  2.  7.100
    
libpostproc    54.  5.100 / 54.  5.100
    
[mpeg2video @ 0x390cc60] Invalid frame dimensions 0x0.
    
Last message repeated 7 times
    
Input #0, mpegts, from 'udp://@xxx.xx.xx.xx:xxxx':
    
Duration: N/A, start: 144.130744, bitrate: 4128 kb/s
    
Program 1 
    
Metadata:
    
  service_name    : Program-1   
    
  service_provider: Encoder 
    
Stream #0:0[0x42]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 16:15 DAR 4:3], 4000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    
Stream #0:1[0x43]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s
    
Stream mapping:
    
Stream #0:0 -> #0:0 (mpeg2video (native) -> png (native))
    
Press [q] to stop, [?] for help
    
Output #0, image2, to 'player.png':
    
Metadata:
    
encoder         : Lavf57.71.100
    
Stream #0:0: Video: png, rgb24, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    
Metadata:
    
  encoder         : Lavc57.89.100 png
    
frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1 drop=1 speed=0.729x    
    
video:777kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  • Moving an overlay smoothly

    6 décembre 2017, par techr

    I have a sliding video overlay on top of a background screen and move it from point a to point b.

    The resulting video produces choppy movement. The overlay moves a step at a time instead of in one continous motion.

    Here’s an example of the code :

    ffmpeg -y -stream_loop -1 -i b.mpg -i bg.jpg -filter_complex "
    
[0:v]scale=320:240[vid];[1][vid]overlay=x='(180+(30-180)*(t-
    
0)/60)*between(t,0,60)+(30+(290-30)*(t-60)/60)*between(t,60,120)':y='(120+
    
(120-120)*(t-0)/60)*between(t,0,60)+(120+(30-120)*(t-
    
60)/60)*between(t,60,120)'[out]" -map "[out]" -r 29.97 -aspect 4:3 -b:v 
    
4000k -minrate 4000k -maxrate 4000k -bufsize 2000k -t 64 t.mpg
    

    
Input #0, mpegvideo, from 'b.mpg':
    
Duration: 00:00:32.34, bitrate: 4000 kb/s
    
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 
    
[SAR 32:27 DAR 16:9], 4000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
    
Input #1, image2, from 'bg.jpg':
    
Duration: 00:00:00.04, start: 0.000000, bitrate: 19637 kb/s
    
Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 640x480, 
    
25 tbr, 25 tbn, 25 tbc
    
Stream mapping:
    
Stream #0:0 (mpeg2video) -> scale
    
Stream #1:0 (mjpeg) -> overlay:main
    
overlay -> Stream #0:0 (mpeg1video)
    
Press [q] to stop, [?] for help
    
[swscaler @ 0000000002adc740] deprecated pixel format used, make sure you 
    
did set range correctly
    
Output #0, mpeg, to 't.mpg':
    
Metadata:
    
encoder         : Lavf57.73.100
    
Stream #0:0: Video: mpeg1video, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 
    
4000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc (default)
    
Metadata:
    
encoder         : Lavc57.99.100 mpeg1video
    
Side data:
    
cpb: bitrate max/min/avg: 4000000/4000000/4000000 buffer size: 2000000 
    
vbv_delay: -1
    
warning, clipping 1 dct coefficients to -255..255repeated 2 timesnter

    Link to video here : https://youtu.be/EE_hrjy4ilg

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