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  • Gestion des droits de création et d’édition des objets

    8 février 2011, par

    Par défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;

  • 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 (...)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

Sur d’autres sites (12058)

  • FFmpeg Time Lapse from Sources with Long Frozen Tail End

    5 juillet 2019, par Rich_F

    My source for inputs into FFmpeg is either one AVI file or a concat of many of them. Either way my resulting timelapse file has a long tail of frames that are a repeat of a single frame. It’s like a very long freeze frame is resulting on the end of my output file.

    I’m on an older Mac Pro so I can’t update my FFmpeg. I have a laptop that has a newer version and I get the same there as well. I’m not sure if it’s because my source files are AVI or not.

    ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
    
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags=-I/System/Library/Frameworks/JavaVM.framework/Versions/Current/Headers/ --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --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-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
    
    libavutil      56. 22.100 / 56. 22.100
    
    libavcodec     58. 35.100 / 58. 35.100
    
    libavformat    58. 20.100 / 58. 20.100
    
    libavdevice    58.  5.100 / 58.  5.100
    
    libavfilter     7. 40.101 /  7. 40.101
    
    libavresample   4.  0.  0 /  4.  0.  0
    
    libswscale      5.  3.100 /  5.  3.100
    
    libswresample   3.  3.100 /  3.  3.100
    
    libpostproc    55.  3.100 / 55.  3.100
    
[avi @ 0x7fa82080c800] sample size (1) != block align (2)
    
Guessed Channel Layout for Input Stream #0.1 : mono
    
Input #0, avi, from 'concat:16460001.AVI|16460002.AVI|16460003.AVI|16460004.AVI|16460005.AVI|16460006.AVI|16460007.AVI|16460008.AVI|16460009.AVI|16460010.AVI|16460011.AVI|16460012.AVI|16460013.AVI|16460014.AVI|16460015.AVI|16460016.AVI|16460017.AVI|16460018.AVI|16460019.AVI|16460020.AVI|16460021.AVI':
    
    Duration: 00:10:02.00, start: 0.000000, bitrate: 365923 kb/s
    
        Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj420p(pc, bt470bg/unknown/unknown), 1280x720, 30 fps, 30 tbr, 30 tbn, 30 tbc
    
        Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s16, 512 kb/s
    
Stream mapping:
    
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
    
    Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
[libx264 @ 0x7fa82082cc00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
    
[libx264 @ 0x7fa82082cc00] profile High, level 3.1
    
[libx264 @ 0x7fa82082cc00] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=12 lookahead_threads=2 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=16 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:
    
        encoder         : Lavf58.20.100
    
        Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1280x720, q=-1--1, 16 fps, 16384 tbn, 16 tbc
    
        Metadata:
    
            encoder         : Lavc58.35.100 libx264
    
        Side data:
    
            cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
        Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 69 kb/s
    
        Metadata:
    
            encoder         : Lavc58.35.100 aac
    
frame= 1962 fps=1.2 q=-1.0 Lsize=  136725kB time=03:24:07.00 bitrate=  91.5kbits/s dup=0 drop=365448 speed=7.41x
    
video:31548kB audio:103624kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.149437%
    
[libx264 @ 0x7fa82082cc00] frame I:10    Avg QP:18.74  size: 62176
    
[libx264 @ 0x7fa82082cc00] frame P:514   Avg QP:21.24  size: 30528
    
[libx264 @ 0x7fa82082cc00] frame B:1438  Avg QP:22.74  size: 11121
    
[libx264 @ 0x7fa82082cc00] consecutive B-frames:  1.4%  2.0%  2.0% 94.6%
    
[libx264 @ 0x7fa82082cc00] mb I  I16..4:  2.1% 97.2%  0.7%
    
[libx264 @ 0x7fa82082cc00] mb P  I16..4:  2.0% 33.3%  0.1%  P16..4: 37.7% 12.0% 10.4%  0.0%  0.0%    skip: 4.5%
    
[libx264 @ 0x7fa82082cc00] mb B  I16..4:  0.7% 11.5%  0.0%  B16..8: 29.1%  4.8%  1.3%  direct:12.0%  skip:40.6%  L0:47.5% L1:42.9% BI: 9.6%
    
[libx264 @ 0x7fa82082cc00] 8x8 transform intra:94.3% inter:83.0%
    
[libx264 @ 0x7fa82082cc00] coded y,uvDC,uvAC intra: 73.4% 66.7% 8.5% inter: 25.9% 46.8% 2.2%
    
[libx264 @ 0x7fa82082cc00] i16 v,h,dc,p: 17% 33% 26% 24%
    
[libx264 @ 0x7fa82082cc00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 23% 51%  1%  2%  1%  4%  1%  2%
    
[libx264 @ 0x7fa82082cc00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 21% 19%  5%  8%  7% 13%  5%  5%
    
[libx264 @ 0x7fa82082cc00] i8c dc,h,v,p: 46% 29% 23%  2%
    
[libx264 @ 0x7fa82082cc00] Weighted P-Frames: Y:47.5% UV:19.3%
    
[libx264 @ 0x7fa82082cc00] ref P L0: 45.0% 13.8% 20.6% 15.7%  5.0%
    
[libx264 @ 0x7fa82082cc00] ref B L0: 61.1% 30.4%  8.5%
    
[libx264 @ 0x7fa82082cc00] ref B L1: 85.8% 14.2%
    
[libx264 @ 0x7fa82082cc00] kb/s:2107.54
    
[aac @ 0x7fa82081ea00] Qavg: 130.084

    I’ve read this thread and tried to follow it :

    Create time lapse video from other video

    Here are some trials I’ve attempted before, all with the same output :

    # ffmpeg -y -i $mov -vf framestep=10,setpts=N/FRAME_RATE/TB,fps=2 -r 30 $out
    
# ffmpeg -y -i $mov -vf framestep=10,setpts=.01*PTS -r 30 $out
    
# ffmpeg -y -i $mov -vf framestep=10,setpts=.1*PTS -r 30 $out
    
# ffmpeg -y -i "concat:16460001.AVI|16460002.AVI|16460003.AVI|16460004.AVI|16460005.AVI|16460006.AVI|16460007.AVI|16460008.AVI|16460009.AVI|16460010.AVI|16460011.AVI|16460012.AVI|16460013.AVI|16460014.AVI|16460015.AVI|16460016.AVI|16460017.AVI|16460018.AVI|16460019.AVI|16460020.AVI|16460021.AVI" -vf framestep=10,setpts=.05*PTS -r 30 $out
    
ffmpeg -y -i "concat:16460001.AVI|16460002.AVI|16460003.AVI|16460004.AVI|16460005.AVI|16460006.AVI|16460007.AVI|16460008.AVI|16460009.AVI|16460010.AVI|16460011.AVI|16460012.AVI|16460013.AVI|16460014.AVI|16460015.AVI|16460016.AVI|16460017.AVI|16460018.AVI|16460019.AVI|16460020.AVI|16460021.AVI" -r 16 -filter:v "setpts=0.01*PTS" out.mp4

    Am I overlooking something ? I’m trying to speed up the inputs into a single file to quickly review incoming security footage. How can I do this without the super long useless tail at the end ?

  • How to Write to AVI with OpenCV Python on Windows 10

    29 juillet 2019, par Novak

    I want to write properly formed frames of video data to an AVI.

    All attempts fail.

    What I end up with, after long efforts of debugging, are *.avi files of non-zero length in the desired directory, which will not play with any of multiple video players already installed on my system.

    Please note : High quality answers will be COMPLETE and DETAIL oriented. In particular, questions about writing video with OpenCV tend to generate drive-by responses including little more than another four-letter code to stick in fourcc. Answers which do so without also telling me at a minimum what file extension to use, what file type it will generate, and why it is expected to work over what I give above are unhelpful.

    Here are the salient details of the system :

    Operating System : Windows 10
    Language : Python 3.7, with Anaconda 3
    OpenCV : 4.1.0

    Here Is What I Have Done/Tried :

    Installed FFMPEG as per this link, restarted Anaconda, and verified ffmpeg (ffmpeg -version) from within Anaconda, with the following result :

    ffmpeg version N-94396-g47b6ca0b02 Copyright (c) 2000-2019 the FFmpeg developers
    
built with gcc 9.1.1 (GCC) 20190716
    
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-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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
    
libavutil      56. 32.100 / 56. 32.100
    
libavcodec     58. 55.100 / 58. 55.100
    
libavformat    58. 30.100 / 58. 30.100
    
libavdevice    58.  9.100 / 58.  9.100
    
libavfilter     7. 58.100 /  7. 58.100
    
libswscale      5.  6.100 /  5.  6.100
    
libswresample   3.  6.100 /  3.  6.100
    
libpostproc    55.  6.100 / 55.  6.100

    Multiple variations on the theme of :

    import cv2
    
fourcc = cv2.VideoWriter_fourcc(*"DIVX")
    
vidout = cv2.VideoWriter(baseDir + "videos\\foo.avi", fourcc, 30, (530, 476))
    

    
for frame in frames:
    
    <do stuff="stuff" to="to" generate="generate" foo="foo">
    
    cv2.imshow("foo", foo)
    
    vidout.write(foo)
    
vidout.release()
    
</do>

    Verified shape, dtype, and general viability of output data with cv2.imshow("foo", foo)

    Results : Unplayable AVI files

  • ffmpeg concatenate two videos, unexpectedly changes the first second(s) of 2nd video

    29 juin 2019, par Roy

    I used ffmpeg to concatenate two videos of my game play recordings. I wrote a list.txt file which lists the two files :

    list.txt:
    
file 2019~06~28_~_Game_1_~_Part_2.mp4
    
file 2019~06~28_~_Game_1_~_Part_3.mp4

    I then run ffmpeg to concat them :

    ffmpeg -safe 0 -f concat -i list.txt -c copy "output.mp4"

    However, the resulting video seems to be skipping frames (or going through them really quickly) at the first second(s) of the second video, causing the perception of the motion suddenly fast-forwarded.

    The two videos were recorded by the same game video recorder "GeForce Experience" in one game session. They should match smoothly when concatenated.

    Here is the output of ffmpeg :

    ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 7.2.0 (GCC)
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --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-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
  libpostproc    54.  7.100 / 54.  7.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001600bbdb5e0] Auto-inserting h264_mp4toannexb bitstream filter
    
Input #0, concat, from 'list.txt':
    
  Duration: N/A, start: 0.000000, bitrate: 24674 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], 24479 kb/s, 59.69 fps, 60 tbr, 90k tbn, 120 tbc
    
    Metadata:
    
      creation_time   : 2019-06-29T04:43:18.000000Z
    
      handler_name    : VideoHandle
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s
    
    Metadata:
    
      creation_time   : 2019-06-29T04:43:18.000000Z
    
      handler_name    : SoundHandle
    
File 'output.mp4' already exists. Overwrite ? [y/N] y
    
Output #0, mp4, to 'output.mp4':
    
  Metadata:
    
    encoder         : Lavf57.83.100
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 24479 kb/s, 59.69 fps, 60 tbr, 90k tbn, 90k tbc
    
    Metadata:
    
      creation_time   : 2019-06-29T04:43:18.000000Z
    
      handler_name    : VideoHandle
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s
    
    Metadata:
    
      creation_time   : 2019-06-29T04:43:18.000000Z
    
      handler_name    : SoundHandle
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
Press [q] to stop, [?] for help
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001600bbdb5e0] Auto-inserting h264_mp4toannexb bitstream filter
    
frame= 7405 fps=0.0 q=-1.0 Lsize=  221175kB time=00:02:03.63 bitrate=14655.4kbits/s speed= 157x
    
video:218137kB audio:2862kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.079741%

    In particular, I don’t know what does "Auto-inserting h254_mp4toannexb bitstream filter" mean. Did this caused the unexpected change ?

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