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  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Participer à sa traduction

    10 avril 2011

    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • 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 (14791)

  • how to make ffmpeg transcoding from mjpeg to h264 in real time ?

    3 août 2020, par SolskGaer

    I have a mjpeg stream which output picture 10FPS(cellphone screenshot), and I use the following command to trancode it to a h264 stream and play it on my laptop

    


    ffmpeg -f mjpeg -r 20 -y -i http://127.0.0.1:53293/  -vcodec libx264 -preset veryfast -profile:v baseline -b:v 1024k -r 10 -f h264 pipe:1 | ffplay -i pipe:0


    


    but the output stream is a few seconds behind the cellphone screen. Here is the output of ffmpeg

    


    ffplay version 4.3.1 Copyright (c) 2003-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mjpeg, from 'http://127.0.0.1:53293/':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 750x1334 [SAR 144:144 DAR 375:667], 20 tbr, 1200k tbn, 20 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x7f8f2900da00] using SAR=1/1
[libx264 @ 0x7f8f2900da00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7f8f2900da00] profile Constrained Baseline, level 3.2, 4:2:0, 8-bit
Output #0, h264, to 'pipe:1':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264), yuvj420p(pc), 750x1334 [SAR 144:144 DAR 375:667], q=-1--1, 1024 kb/s, 10 fps, 10 tbn, 10 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/1024000 buffer size: 0 vbv_delay: N/A
frame=   30 fps=5.2 q=29.0 size=      97kB time=00:00:00.10 bitrate=7911.0kbits/s dup=0 drop=26 speed=0.0172
frame=   33 fps=5.2 q=41.0 size=     190kB time=00:00:00.40 bitrate=3888.2kbits/s dup=0 drop=29 speed=0.0633
frame=   35 fps=5.1 q=40.0 size=     253kB time=00:00:00.60 bitrate=3457.8kbits/s dup=0 drop=31 speed=0.0874
frame=   38 fps=5.1 q=40.0 size=     330kB time=00:00:00.90 bitrate=3006.1kbits/s dup=0 drop=34 speed=0.122x
frame=   40 fps=5.1 q=40.0 size=     381kB time=00:00:01.10 bitrate=2838.3kbits/s dup=0 drop=36 speed=0.139x
frame=   43 fps=5.1 q=39.0 size=     460kB time=00:00:01.40 bitrate=2691.3kbits/s dup=0 drop=39 speed=0.166x
frame=   45 fps=5.0 q=39.0 size=     505kB time=00:00:01.60 bitrate=2585.9kbits/s dup=0 drop=41 speed=0.178x
frame=   48 fps=5.0 q=38.0 size=     552kB time=00:00:01.90 bitrate=2381.0kbits/s dup=0 drop=44 speed= 0.2x 
frame=   50 fps=5.0 q=33.0 size=     562kB time=00:00:02.10 bitrate=2190.7kbits/s dup=0 drop=46 speed=0.209x
frame=   53 fps=5.0 q=37.0 size=     572kB time=00:00:02.40 bitrate=1951.2kbits/s dup=0 drop=49 speed=0.227x
frame=   55 fps=5.0 q=37.0 size=     581kB time=00:00:02.60 bitrate=1830.0kbits/s dup=0 drop=51 speed=0.234x
frame=   58 fps=5.0 q=36.0 size=     591kB time=00:00:02.90 bitrate=1670.8kbits/s dup=0 drop=54 speed=0.25x 
frame=   60 fps=4.9 q=35.0 size=     598kB time=00:00:03.10 bitrate=1580.2kbits/s dup=0 drop=56 speed=0.255x
frame=   63 fps=5.0 q=35.0 size=     608kB time=00:00:03.40 bitrate=1465.2kbits/s dup=0 drop=59 speed=0.268x
frame=   65 fps=4.9 q=34.0 size=     613kB time=00:00:03.60 bitrate=1395.7kbits/s dup=0 drop=61 speed=0.273x
frame=   68 fps=5.0 q=34.0 size=     659kB time=00:00:03.90 bitrate=1384.5kbits/s dup=0 drop=64 speed=0.284x
frame=   70 fps=4.9 q=34.0 size=     682kB time=00:00:04.10 bitrate=1363.2kbits/s dup=0 drop=66 speed=0.288x
frame=   73 fps=4.9 q=35.0 size=     720kB time=00:00:04.40 bitrate=1340.1kbits/s dup=0 drop=69 speed=0.298x
frame=   75 fps=4.9 q=35.0 size=     746kB time=00:00:04.60 bitrate=1329.1kbits/s dup=0 drop=71 speed=0.301x
frame=   78 fps=4.9 q=36.0 size=     786kB time=00:00:04.90 bitrate=1314.6kbits/s dup=0 drop=74 speed=0.31x 
frame=   80 fps=4.9 q=36.0 size=     811kB time=00:00:05.10 bitrate=1303.3kbits/s dup=0 drop=76 speed=0.312x


    


    I don't think the CPU of my laptop is the bottleneck of this process, here is the spec of my laptop

    


    
      Model Name: MacBook Pro
      Model Identifier: MacBookPro16,1
      Processor Name: 6-Core Intel Core i7
      Processor Speed: 2.6 GHz
      Number of Processors: 1
      Total Number of Cores: 6
      L2 Cache (per Core): 256 KB
      L3 Cache: 12 MB
      Hyper-Threading Technology: Enabled
      Memory: 16 GB


    


    but I can't track the reason why this happened. What can I make the output stream be real time ? Any suggestion would be appreciated.

    


  • FFmpeg start slowly with multiple instance on nvidia T4 GPU

    3 août 2020, par wyWang
    


    environment：

    


      

    1. OS:Centos7

      2. 


    2. FFMPEG version : 4.2

      3. 


    3. GPU : NVIDIA Tesla T4

      4. 


    


    


    I have a requirement to work with multiple FFMPEG instance,command like this :

    


    ffmpeg -y -loglevel info -hwaccel cuvid -hwaccel_output_format cuda -c:v h264_cuvid \
    -i http://xx/xxxx.mp4 \
    -c:v  h264_nvenc  -ss 0 -t 600 out.mp4


    


    and the output like this :

    


    ffmpeg version 4.2.git Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
  configuration: --enable-cuda-nvcc --enable-cuda --enable-cuvid --enable-nvenc --enable-libnpp --prefix=/snbeauty//platform/centos --pkg-config-flags=--static --extra-cflags='-I/snbeauty//platform/centos/include -I/usr/local/cuda/include/ -Werror=implicit-function-declaration -std=gnu99' --extra-ldflags='-L/snbeauty//platform/centos/lib64 -L/snbeauty//platform/centos/lib -L/usr/local/lib64 -L/usr/lib64 -L/usr/local/cuda/lib64 -L/lib64' --extra-libs='-lpthread -lm -lEGL -lGL -lpng -lYNEffect -ltracker -lcuda -lcudart' --bindir=/snbeauty//platform/centos/bin --enable-static --enable-nonfree --enable-libfreetype --enable-libfribidi --enable-libfontconfig --enable-filters --enable-version3 --enable-gpl --enable-libass --enable-libfdk_aac --enable-encoder=libfdk_aac --enable-opengl --enable-filter=xiu --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libtheora --enable-libwebp --enable-frei0r --enable-openssl --enable-gray --enable-libxml2 --enable-libxvid
  libavutil      56. 42.100 / 56. 42.100
  libavcodec     58. 73.102 / 58. 73.102
  libavformat    58. 39.101 / 58. 39.101
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 77.100 /  7. 77.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://xxx/xxxx.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:38:52.05, start: 0.000000, bitrate: 5370 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080, 5245 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 119 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.39.101
    Stream #0:0(und): Video: h264 (h264_nvenc) (Main) (avc1 / 0x31637661), cuda, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 2000 kb/s, 25 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc58.73.102 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: N/A
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc58.73.102 aac
frame=15000 fps=336 q=26.0 Lsize=  152462kB time=00:10:00.00 bitrate=2081.6kbits/s speed=13.4x    
video:142668kB audio:9418kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.247139%
[aac @ 0x32437c0] Qavg: 168.657

real    0m45.568s
user    0m29.034s
sys 0m2.961s


    


    is very fast

    


    But when I try concurrent 10 processes to run this command with different input url,ffmpeg start is very slowly. Then I found FFmpeg is slowly in this step :

    


    Stream mapping:
  Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))


    


    When the video is very short(like 0.5s or 1s), FFmpeg takes a long time to start.The actual codec takes less time than the boot time.

    


    I would like to ask what causes this problem ? (Nvidia GPU limit or FFmpeg) .And any way to solve it.

    


    Thanks !

    


  • record long videos from multiple webcams with FFmpeg

    4 août 2020, par Nagamoto

    I am using

    


    ffmpeg -f dshow -vcodec mjpeg -t 6000 -rtbufsize 2.14748e+09  -video_size 1920x1080 -framerate 60 -i video=camID-0 -f dshow -vcodec mjpeg -t 6000 -rtbufsize 2.14748e+09  -video_size 1920x1080 -framerate 60 -i video=camID-1 -map 0  -c:v libx264 -preset ultrafast -y -r 30 fileName_0.mp4 -map 1  -c:v libx264 -preset ultrafast -y -r 30 fileName_1.mp4

    


    to record video from two webcams. Since the output will be compressed further down the line I am mostly concerned with quality and not losing frames. But after about 2min the real-time buffer is full :

    


    [dshow @ 00000221716edf80] real-time buffer [@device_pnp_\\?\usb#vid_15aa&pid_1555&mi_00#6&b8e4142&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global] [video input] too full or near too full (75% of size: 2147480000 [rtbufsize parameter])! frame dropped!


    


    On the other hand capturing uncompressed video results in huge filesizes (1.3 TB for an hour) but encoding with the settings above the computer can't keep up.
Currently the webcams capture 60fps- which is not a must but I can't set them to anything lower.

    


    How can I record long video (max 1.5h) with good quality while keeping file-sizes manageable ?

    


    ffmpeg -f dshow -list_options true -i video="3.0 USB Camera"



ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200621
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[dshow @ 000001f32953c380] DirectShow video device options (from video devices)
[dshow @ 000001f32953c380]  Pin "Capture" (alternative pin name "0")
[dshow @ 000001f32953c380]   vcodec=mjpeg  min s=1920x1080 fps=60.0002 max s=1920x1080 fps=60.0002
[dshow @ 000001f32953c380]   vcodec=mjpeg  min s=1920x1080 fps=60.0002 max s=1920x1080 fps=60.0002
[dshow @ 000001f32953c380]   vcodec=mjpeg  min s=1280x720 fps=60.0002 max s=1280x720 fps=60.0002
[dshow @ 000001f32953c380]   vcodec=mjpeg  min s=1280x720 fps=60.0002 max s=1280x720 fps=60.0002
[dshow @ 000001f32953c380]   vcodec=mjpeg  min s=640x480 fps=60.0002 max s=640x480 fps=60.0002
[dshow @ 000001f32953c380]   vcodec=mjpeg  min s=640x480 fps=60.0002 max s=640x480 fps=60.0002
[dshow @ 000001f32953c380]   pixel_format=yuyv422  min s=1920x1080 fps=60.0002 max s=1920x1080 fps=60.0002
[dshow @ 000001f32953c380]   pixel_format=yuyv422  min s=1920x1080 fps=60.0002 max s=1920x1080 fps=60.0002
[dshow @ 000001f32953c380]   pixel_format=yuyv422  min s=1280x720 fps=60.0002 max s=1280x720 fps=60.0002
[dshow @ 000001f32953c380]   pixel_format=yuyv422  min s=1280x720 fps=60.0002 max s=1280x720 fps=60.0002
[dshow @ 000001f32953c380]   pixel_format=yuyv422  min s=640x480 fps=60.0002 max s=640x480 fps=60.0002
[dshow @ 000001f32953c380]   pixel_format=yuyv422  min s=640x480 fps=60.0002 max s=640x480 fps=60.0002
video=3.0 USB Camera: Immediate exit requested


    


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