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  • Les vidéos

    21 avril 2011, par

    Comme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
    Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
    Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)

  • (Dés)Activation de fonctionnalités (plugins)

    18 février 2011, par

    Pour gérer l’ajout et la suppression de fonctionnalités supplémentaires (ou plugins), MediaSPIP utilise à partir de la version 0.2 SVP.
    SVP permet l’activation facile de plugins depuis l’espace de configuration de MediaSPIP.
    Pour y accéder, il suffit de se rendre dans l’espace de configuration puis de se rendre sur la page "Gestion des plugins".
    MediaSPIP est fourni par défaut avec l’ensemble des plugins dits "compatibles", ils ont été testés et intégrés afin de fonctionner parfaitement avec chaque (...)

  • Activation de l’inscription des visiteurs

    12 avril 2011, par

    Il est également possible d’activer l’inscription des visiteurs ce qui permettra à tout un chacun d’ouvrir soit même un compte sur le canal en question dans le cadre de projets ouverts par exemple.
    Pour ce faire, il suffit d’aller dans l’espace de configuration du site en choisissant le sous menus "Gestion des utilisateurs". Le premier formulaire visible correspond à cette fonctionnalité.
    Par défaut, MediaSPIP a créé lors de son initialisation un élément de menu dans le menu du haut de la page menant (...)

Sur d’autres sites (11534)

  • Recording screencast using ffmpeg produces audio that is out of sync with the video

    7 décembre 2014, par AgilE

    I’m on Fedora 20. I got it pre-compiled from the repo.

    I use the follow command to record screencasts :

    ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s 1366x768 -i :0.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -crf 0 -threads 0 filename.mkv

    The audio is perfectly synced with the video at the beginning. However, as the video progresses, the audio starts lagging behind severely (say a lag of more than 4 seconds). I’ve included a sample output that ffmpeg shows while recording a video.

    ffmpeg version 2.1.3 Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Jan 25 2014 15:11:42 with gcc 4.8.2 (GCC) 20131212 (Red Hat 4.8.2-7)
    
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-libass --enable-libcdio --enable-libcelt --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
    
  libavutil      52. 48.101 / 52. 48.101
    
  libavcodec     55. 39.101 / 55. 39.101
    
  libavformat    55. 19.104 / 55. 19.104
    
  libavdevice    55.  5.100 / 55.  5.100
    
  libavfilter     3. 90.100 /  3. 90.100
    
  libavresample   1.  1.  0 /  1.  1.  0
    
  libswscale      2.  5.101 /  2.  5.101
    
  libswresample   0. 17.104 /  0. 17.104
    
  libpostproc    52.  3.100 / 52.  3.100
    
Guessed Channel Layout for  Input Stream #0.0 : stereo
    
Input #0, alsa, from 'pulse':
    
  Duration: N/A, start: 1391533629.323015, bitrate: 1536 kb/s
    
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    
[x11grab @ 0x153ad80] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1366 height: 768
    
[x11grab @ 0x153ad80] shared memory extension found
    
Input #1, x11grab, from ':0.0':
    
  Duration: N/A, start: 1391533629.365274, bitrate: 1007124 kb/s
    
    Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, 1007124 kb/s, 30 tbr, 1000k tbn, 30 tbc
    
[swscaler @ 0x1520460] deprecated pixel format used, make sure you did set range correctly
    
No pixel format specified, yuv444p for H.264 encoding chosen.
    
Use -pix_fmt yuv420p for compatibility with outdated media players.
    
[libx264 @ 0x1551420] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x1551420] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit
    
[libx264 @ 0x1551420] 264 - core 138 r2363 c628e3b - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0
    
Output #0, matroska, to 'testing.mkv':
    
  Metadata:
    
    encoder         : Lavf55.19.104
    
    Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1366x768, q=-1--1, 1k tbn, 30 tbc
    
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
    
Stream mapping:
    
  Stream #1:0 -> #0:0 (rawvideo -> libx264)
    
  Stream #0:0 -> #0:1 (pcm_s16le -> pcm_s16le)
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x1520460] Warning: data is not aligned! This can lead to a speedloss
    
frame=  213 fps= 27 q=-1.0 Lsize=    3572kB time=00:00:08.00 bitrate=3653.6kbits/s    
    
video:2025kB audio:1501kB subtitle:0 global headers:0kB muxing overhead 1.291094%
    
[libx264 @ 0x1551420] frame I:1     Avg QP: 0.00  size:692585
    
[libx264 @ 0x1551420] frame P:212   Avg QP: 0.00  size:  6509
    
[libx264 @ 0x1551420] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 0x1551420] mb P  I16..4: 47.2%  0.0%  0.0%  P16..4:  0.1%  0.0%  0.0%  0.0%  0.0%    skip:52.8%
    
[libx264 @ 0x1551420] coded y,u,v intra: 0.7% 0.7% 0.7% inter: 0.1% 0.1% 0.1%
    
[libx264 @ 0x1551420] i16 v,h,dc,p: 100%  0%  0%  0%
    
[libx264 @ 0x1551420] kb/s:2335.32

    Is there something I’m missing ?

  • FFmpeg wrong duration(double) when convert mp4

    13 novembre 2017, par crazymxm

    The output file has the double duration :

    Source video duration :00:01:58.88

    output video duration :00:03:57.76

    （video’s duration is double ，audio’s duration is correct. So， the video looks like played twice, with no sound in the second half ）

    here is the log：

    ./ffmpeg -i /Volumes/LANKEXIN/1383.mp4 out.mp4
    ffmpeg version N-82977-g8fd3e02-tessus Copyright (c) 2000-2016 the FFmpeg developers
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    configuration : —cc=/usr/bin/clang —prefix=/opt/ffmpeg —extra-version=tessus —enable-avisynth —enable-fontconfig —enable-gpl —enable-libass —enable-libbluray —enable-libfreetype —enable-libgsm —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopus —enable-libschroedinger —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzmq —enable-version3 —disable-ffplay —disable-indev=qtkit —disable-indev=x11grab_xcb

      libavutil      55. 43.100 / 55. 43.100
    
  libavcodec     57. 70.100 / 57. 70.100
    
  libavformat    57. 61.100 / 57. 61.100
    
  libavdevice    57.  2.100 / 57.  2.100
    
  libavfilter     6. 68.100 /  6. 68.100
    
  libswscale      4.  3.101 /  4.  3.101
    
  libswresample   2.  4.100 /  2.  4.100
    
  libpostproc    54.  2.100 / 54.  2.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Volumes/LANKEXIN/1383.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isom
    
    creation_time   : 2017-10-30T14:58:05.000000Z
    
    encoder         : mp4creator 1.6.1d
    
  Duration: 00:01:58.88, start: 0.000000, bitrate: 1918 kb/s
    
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1729 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    
    Metadata:
    
      creation_time   : 2017-10-30T14:58:05.000000Z
    
      encoder         : VC Coding
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
    
    Metadata:
    
      creation_time   : 2017-10-30T14:58:05.000000Z
    
File 'out.mp4' already exists. Overwrite ? [y/N] y
    
[libx264 @ 0x7fbaca003c00] using SAR=1/1
    
[libx264 @ 0x7fbaca003c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    
[libx264 @ 0x7fbaca003c00] profile High, level 3.1
    
[libx264 @ 0x7fbaca003c00] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=6 lookahead_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=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to 'out.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isom
    
    encoder         : Lavf57.61.100
    
    Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
    
    Metadata:
    
      creation_time   : 2017-10-30T14:58:05.000000Z
    
      encoder         : Lavc57.70.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
    Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s (default)
    
    Metadata:
    
      creation_time   : 2017-10-30T14:58:05.000000Z
    
      encoder         : Lavc57.70.100 aac
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
frame=   46 fps=0.0 q=0.0 size=       0kB time=00:00:00.93 bitrate=   0.0kbits/sframe=   64 fps= 45 q=28.0 size=     137kB time=00:00:01.66 bitrate= 672.2kbits/frame=   85 fps= 44 qframe= 5944 fps= 33 q=-1.0 Lsize=   38746kB time=00:03:57.64 bitrate=1335.7kbits/s speed=1.33x    4kB time=00:00:02.94 bitrate= 818.0kbits/s speed= 1.2x    
    
video:36779kB audio:1846kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.311413%
    
[libx264 @ 0x7fbaca003c00] frame I:24    Avg QP:19.49  size: 67090
    
[libx264 @ 0x7fbaca003c00] frame P:1806  Avg QP:21.65  size: 14304
    
[libx264 @ 0x7fbaca003c00] frame B:4114  Avg QP:25.42  size:  2484
    
[libx264 @ 0x7fbaca003c00] consecutive B-frames:  2.2%  8.1% 25.5% 64.2%
    
[libx264 @ 0x7fbaca003c00] mb I  I16..4: 20.6% 55.8% 23.6%
    
[libx264 @ 0x7fbaca003c00] mb P  I16..4:  5.2%  9.3%  0.8%  P16..4: 36.0%  9.9%  4.2%  0.0%  0.0%    skip:34.5%
    
[libx264 @ 0x7fbaca003c00] mb B  I16..4:  0.5%  1.0%  0.0%  B16..8: 27.2%  1.8%  0.2%  direct: 0.9%  skip:68.5%  L0:48.6% L1:47.6% BI: 3.8%
    
[libx264 @ 0x7fbaca003c00] 8x8 transform intra:60.9% inter:78.2%
    
[libx264 @ 0x7fbaca003c00] coded y,uvDC,uvAC intra: 38.3% 61.5% 12.3% inter: 6.6% 11.3% 0.6%
    
[libx264 @ 0x7fbaca003c00] i16 v,h,dc,p: 22% 35% 10% 33%
    
[libx264 @ 0x7fbaca003c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 24% 21%  5%  6%  6%  6%  5%  6%
    
[libx264 @ 0x7fbaca003c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 33% 11%  4%  7%  6%  6%  4%  4%
    
[libx264 @ 0x7fbaca003c00] i8c dc,h,v,p: 43% 30% 20%  7%
    
[libx264 @ 0x7fbaca003c00] Weighted P-Frames: Y:0.3% UV:0.2%
    
[libx264 @ 0x7fbaca003c00] ref P L0: 73.5%  9.0% 13.8%  3.7%  0.0%
    
[libx264 @ 0x7fbaca003c00] ref B L0: 92.4%  6.6%  1.1%
    
[libx264 @ 0x7fbaca003c00] ref B L1: 97.7%  2.3%
    
[libx264 @ 0x7fbaca003c00] kb/s:1267.21
    
[aac @ 0x7fbaca021800] Qavg: 897.576

  • FFMpeg - Split Window RTMP - Delay on Second Stream

    22 février 2016, par Nick Smit

    I’m trying to combine two live RTMP sources into one split screen output with combined audio. The output is then sent on to a receiving RTMP server.

    Using the following command, which uses the same RTMP input for both feeds, I’ve managed to get the above working, however the input on the left is delayed by about 2 seconds from the one on the right.

    ffmpeg -re -i rtmp://myserver.tld/live/stream_key -re -i rtmp://myserver.tld/live/stream_key \
    
-filter_complex "\
    
nullsrc=size=1152x720 [base];\
    
[0:v] crop=576:720 [upperleft];\
    
[1:v] crop=576:720 [upperright];\
    
[base][upperleft] overlay=shortest=1 [tmp1];\
    
[tmp1][upperright] overlay=shortest=1:x=576;\
    
[0:a][1:a]amix \
    
" -c:a libfdk_aac -ar 44100 -threads 32 -c:v libx264 -g 50 -preset ultrafast -tune zerolatency -f flv rtmp://myserver.tld/live/new_stream_key

    Output :

    ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
    
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
    
configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --bindir=/home/ubuntu/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
    
libavutil      55.  4.100 / 55.  4.100
    
libavcodec     57.  7.100 / 57.  7.100
    
libavformat    57.  8.102 / 57.  8.102
    
libavdevice    57.  0.100 / 57.  0.100
    
libavfilter     6. 12.100 /  6. 12.100
    
libswscale      4.  0.100 /  4.  0.100
    
libswresample   2.  0.100 /  2.  0.100
    
libpostproc    54.  0.100 / 54.  0.100
    
[flv @ 0x3a0e940] video stream discovered after head already parsed
    
Input #0, flv, from 'rtmp://myserver.tld/live/stream_key':
    
Metadata:
    
Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    
displayWidth    : 1152
    
displayHeight   : 720
    
fps             : 29
    
profile         :
    
level           :
    
Duration: 00:00:00.00, start: 5.717000, bitrate: N/A
    
Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
    
Stream #0:1: Video: h264 (High), yuv420p, 1152x720, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
    
[flv @ 0x3a49e00] video stream discovered after head already parsed
    
Input #1, flv, from 'rtmp://myserver.tld/live/stream_key':
    
Metadata:
    
Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    
displayWidth    : 1152
    
displayHeight   : 720
    
fps             : 29
    
profile         :
    
level           :
    
Duration: 00:00:00.00, start: 9.685000, bitrate: N/A
    
Stream #1:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
    
Stream #1:1: Video: h264 (High), yuv420p, 1152x720, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
    
[libx264 @ 0x3a9cd60] Application has requested 32 threads. Using a thread count greater than 16 is not recommended.
    
[libx264 @ 0x3a9cd60] using SAR=1/1
    
[libx264 @ 0x3a9cd60] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x3a9cd60] profile Constrained Baseline, level 3.1
    
[libx264 @ 0x3a9cd60] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=11 lookahead_threads=11 sliced_threads=1 slices=11 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=50 keyint_min=5 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
    
Output #0, flv, to 'rtmp://myserver.tld/live/new_stream_key':
    
Metadata:
    
Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    
displayWidth    : 1152
    
displayHeight   : 720
    
fps             : 29
    
profile         :
    
level           :
    
encoder         : Lavf57.8.102
    
Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1152x720 [SAR 1:1 DAR 8:5], q=-1--1, 25 fps, 1k tbn, 25 tbc (default)
    
Metadata:
    
encoder         : Lavc57.7.100 libx264
    
Stream #0:1: Audio: aac (libfdk_aac) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, s16, 128 kb/s (default)
    
Metadata:
    
encoder         : Lavc57.7.100 libfdk_aac
    
Stream mapping:
    
Stream #0:0 (aac) -> amix:input0
    
Stream #0:1 (h264) -> crop
    
Stream #1:0 (aac) -> amix:input1
    
Stream #1:1 (h264) -> crop
    
overlay -> Stream #0:0 (libx264)
    
amix -> Stream #0:1 (libfdk_aac)
    
Press [q] to stop, [?] for help
    
[flv @ 0x3a0e940] Thread message queue blocking; consider raising the thread_queue_size option (current value: 512)
    
frame=   81 fps= 20 q=15.0 size=     674kB time=00:00:03.24 bitrate=1703.3kbits/frame=  102 fps= 22 q=22.0 size=     945kB time=00:00:04.08 bitrate=1896.4kbits/

    Is there any way to force FFMpeg to read both RTMP inputs at the same time ?

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