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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 ;

  • Dépôt de média et thèmes par FTP

    31 mai 2013, par

    L’outil MédiaSPIP traite aussi les média transférés par la voie FTP. Si vous préférez déposer par cette voie, récupérez les identifiants d’accès vers votre site MédiaSPIP et utilisez votre client FTP favori.
    Vous trouverez dès le départ les dossiers suivants dans votre espace FTP : config/ : dossier de configuration du site IMG/ : dossier des média déjà traités et en ligne sur le site local/ : répertoire cache du site web themes/ : les thèmes ou les feuilles de style personnalisées tmp/ : dossier de travail (...)

  • 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 (...)

Sur d’autres sites (10116)

  • OpenCV's VideoCapture::open Video Source Dialog

    13 novembre 2015, par swtdrgn

    In my current project, when I call VideoCapture::open(camera device index) and the camera is in used by another program, it shows a Video Source dialog and returns true when I select a device that is already in use.

    However, in my [previous] experiment project, when I called VideoCapture::open(camera device index), it doesn’t show this dialog.

    I want to know what is causing the Video Source dialog to show and the program to behave differently from the experimental project.

    This is the source code to the experiment project :

    int main (int argc, char *argv[])
    
{
    

    
    //vars
    
    time_duration td, td1;
    
    ptime nextFrameTimestamp, currentFrameTimestamp, initialLoopTimestamp, finalLoopTimestamp;
    
    int delayFound = 0;
    
    int totalDelay= 0;
    

    
    // initialize capture on default source
    
    VideoCapture capture;
    
    std::cout << "capture.open(0): " << capture.open(0) << std::endl;
    
    std::cout << "NOOO" << std::endl;
    
    namedWindow("video", 1);
    

    
    // set framerate to record and capture at
    
    int framerate = 15;
    

    
    // Get the properties from the camera
    
    double width = capture.get(CV_CAP_PROP_FRAME_WIDTH);
    
    double height = capture.get(CV_CAP_PROP_FRAME_HEIGHT);
    

    
    // print camera frame size
    
    //cout << "Camera properties\n";
    
    //cout << "width = " << width << endl <<"height = "<< height << endl;
    

    
    // Create a matrix to keep the retrieved frame
    
    Mat frame;
    

    
    // Create the video writer
    
    VideoWriter video("capture.avi",0, framerate, cvSize((int)width,(int)height) );
    

    
    // initialize initial timestamps
    
    nextFrameTimestamp = microsec_clock::local_time();
    
    currentFrameTimestamp = nextFrameTimestamp;
    
    td = (currentFrameTimestamp - nextFrameTimestamp);
    

    
    // start thread to begin capture and populate Mat frame
    
    boost::thread captureThread(captureFunc, &frame, &capture);
    
    // loop infinitely
    
    for(bool q=true;q;)
    
    {
    
        if(frame.empty()){continue;}
    
        //if(cvWaitKey( 5 ) == 'q'){ q=false; }
    
        // wait for X microseconds until 1second/framerate time has passed after previous frame write
    
        while(td.total_microseconds() < 1000000/framerate){
    
            //determine current elapsed time
    
            currentFrameTimestamp = microsec_clock::local_time();
    
            td = (currentFrameTimestamp - nextFrameTimestamp);
    
            if(cvWaitKey( 5 ) == 'q'){
    
                std::cout << "B" << std::endl;
    
                q=false;
    
                boost::posix_time::time_duration timeout = boost::posix_time::milliseconds(0);
    
                captureThread.timed_join(timeout);
    
                break;
    
            }
    
        }
    

    
        // determine time at start of write
    
        initialLoopTimestamp = microsec_clock::local_time();
    

    
        // Save frame to video
    
        video << frame;
    
        imshow("video", frame);
    

    
        //write previous and current frame timestamp to console
    
        cout << nextFrameTimestamp << " " << currentFrameTimestamp << " ";
    

    
        // add 1second/framerate time for next loop pause
    
        nextFrameTimestamp = nextFrameTimestamp + microsec(1000000/framerate);
    

    
        // reset time_duration so while loop engages
    
        td = (currentFrameTimestamp - nextFrameTimestamp);
    

    
        //determine and print out delay in ms, should be less than 1000/FPS
    
        //occasionally, if delay is larger than said value, correction will occur
    
        //if delay is consistently larger than said value, then CPU is not powerful
    
        // enough to capture/decompress/record/compress that fast.
    
        finalLoopTimestamp = microsec_clock::local_time();
    
        td1 = (finalLoopTimestamp - initialLoopTimestamp);
    
        delayFound = td1.total_milliseconds();
    
        cout << delayFound << endl;
    

    
        //output will be in following format
    
        //[TIMESTAMP OF PREVIOUS FRAME] [TIMESTAMP OF NEW FRAME] [TIME DELAY OF WRITING]
    
        if(!q || cvWaitKey( 5 ) == 'q'){
    
            std::cout << "C" << std::endl;
    
            q=false;
    
            boost::posix_time::time_duration timeout = boost::posix_time::milliseconds(0);
    
            captureThread.timed_join(timeout);
    
            break;
    
        }
    
    }
    

    
    // Exit
    
    return 0;
    
}

    Video Source Dialog

  • How Opensl es on android control the audio speed ?

    6 décembre 2013, par user1882379

    I use NDK+FFMPEG on android to decode an video file, and transfer the decoded pcm data to opensles for play audio .I register the opengles for the pcm format：

      SLDataFormat_PCM format_pcm;
    
    format_pcm.formatType = SL_DATAFORMAT_PCM;
    
    format_pcm.numChannels = channel;
    
    format_pcm.samplesPerSec = rate * 1000;
    
    format_pcm.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
    
    format_pcm.containerSize = SL_PCMSAMPLEFORMAT_FIXED_16;

    also I convert the decoded pcm data to AV_SAMPLE_FMT_S16 format using swr_convert(...), but the play audio speed is very fast. but if you use sdl , the play speed is normal. It would be sdl can control the play audio speed, but opensles can not. I do not know whether it is my mistake using opensles or opensles can not control audio speed(need application to control)？

  • Video becomes choppy when the order in the hstack filter is changed

    25 octobre 2018, par Mayank

    I have a FFmpeg command wherein I am merging 2 videos side by side using hstack filter. When I place first video on the right hand side and second video on the left hand side, the final merged video is perfect in quality and plays smoothly.

    However, when I swap the order in hstack filter, the final video is very choppy.

    Can someone please let me know the issue in this command ? Many thanks in advance.

    Also, the file size of the non working file is almost double than that of working file. Can you explain why ?

    Here is the working command :

    ffmpeg -i 1_a.opus -i 2_a.opus -itsoffset 0.024 -i 1_v.mp4 -itsoffset 0.113 -i 2_v.mp4 -filter_complex "[1:a]adelay=15646|15646[a1]; [0:a][a1]amix; [3:v]trim=0:15.646,geq=0:128:128[silence]; [3:v]fifo[3v]; [silence][3v]concat[3_v_silence]; [3_v_silence][2:v]hstack" -preset ultrafast -y n_m_bars_try2.mp4

    output :

    ffmpeg version 4.0.2-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
    
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
    
  libavutil      56. 14.100 / 56. 14.100
    
  libavcodec     58. 18.100 / 58. 18.100
    
  libavformat    58. 12.100 / 58. 12.100
    
  libavdevice    58.  3.100 / 58.  3.100
    
  libavfilter     7. 16.100 /  7. 16.100
    
  libswscale      5.  1.100 /  5.  1.100
    
  libswresample   3.  1.100 /  3.  1.100
    
  libpostproc    55.  1.100 / 55.  1.100
    
Input #0, ogg, from '1_a.opus':
    
  Duration: 00:01:03.82, start: -0.020000, bitrate: 37 kb/s
    
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    
Input #1, ogg, from '2_a.opus':
    
  Duration: 00:00:52.40, start: -0.020000, bitrate: 44 kb/s
    
    Stream #1:0: Audio: opus, 48000 Hz, stereo, fltp
    
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '1_v.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.12.100
    
  Duration: 00:01:03.85, start: 0.000000, bitrate: 2644 kb/s
    
    Stream #2:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 2633 kb/s, 333 fps, 333 tbr, 10656 tbn, 666 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '2_v.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.12.100
    
  Duration: 00:00:52.32, start: 0.000000, bitrate: 861 kb/s
    
    Stream #3:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 860 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
Stream mapping:
    
  Stream #0:0 (opus) -> amix:input0
    
  Stream #1:0 (opus) -> adelay
    
  Stream #2:0 (h264) -> hstack:input1
    
  Stream #3:0 (h264) -> trim
    
  Stream #3:0 (h264) -> fifo
    
  amix -> Stream #0:0 (aac)
    
  hstack -> Stream #0:1 (libx264)
    
Press [q] to stop, [?] for help
    
[libx264 @ 0x528d600] using SAR=1/1
    
[libx264 @ 0x528d600] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowShuffle
    
[libx264 @ 0x528d600] profile Constrained Baseline, level 3.1
    
[libx264 @ 0x528d600] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=3 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=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
    
Output #0, mp4, to 'navid_mayank_bars_try2.mp4':
    
  Metadata:
    
    encoder         : Lavf58.12.100
    
    Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    
    Metadata:
    
      encoder         : Lavc58.18.100 aac
    
    Stream #0:1: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x480 [SAR 1:1 DAR 8:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
    
    Metadata:
    
      encoder         : Lavc58.18.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
frame= 1704 fps= 42 q=-1.0 Lsize=   14440kB time=00:01:08.12 bitrate=1736.5kbits/s dup=3 drop=21229 speed=1.69x    
    
video:13448kB audio:953kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.269503%
    
[aac @ 0x52b8680] Qavg: 22255.799
    
[libx264 @ 0x528d600] frame I:7     Avg QP:16.29  size: 46284
    
[libx264 @ 0x528d600] frame P:1697  Avg QP:18.36  size:  7924
    
[libx264 @ 0x528d600] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 0x528d600] mb P  I16..4:  1.8%  0.0%  0.0%  P16..4: 31.0%  0.0%  0.0%  0.0%  0.0%    skip:67.2%
    
[libx264 @ 0x528d600] coded y,uvDC,uvAC intra: 29.9% 59.3% 17.5% inter: 13.4% 24.6% 0.8%
    
[libx264 @ 0x528d600] i16 v,h,dc,p: 36% 29% 18% 17%
    
[libx264 @ 0x528d600] i8c dc,h,v,p: 42% 25% 21% 11%
    
[libx264 @ 0x528d600] kb/s:1616.23

    Non working command :

    ffmpeg -i 1_a.opus -i 2_a.opus -itsoffset 0.024 -i 1_v.mp4 -itsoffset 0.113 -i 2_v.mp4 -filter_complex "[1:a]adelay=15646|15646[a1]; [0:a][a1]amix; [3:v]trim=0:15.646,geq=0:128:128[silence]; [3:v]fifo[3v]; [silence][3v]concat[3_v_silence]; [2:v][3_v_silence]hstack" -preset ultrafast -y m_n_bars_try2.mp4

    output :

    ffmpeg version 4.0.2-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
    
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
    
  libavutil      56. 14.100 / 56. 14.100
    
  libavcodec     58. 18.100 / 58. 18.100
    
  libavformat    58. 12.100 / 58. 12.100
    
  libavdevice    58.  3.100 / 58.  3.100
    
  libavfilter     7. 16.100 /  7. 16.100
    
  libswscale      5.  1.100 /  5.  1.100
    
  libswresample   3.  1.100 /  3.  1.100
    
  libpostproc    55.  1.100 / 55.  1.100
    
Input #0, ogg, from '1_a.opus':
    
  Duration: 00:01:03.82, start: -0.020000, bitrate: 37 kb/s
    
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    
Input #1, ogg, from '2_a.opus':
    
  Duration: 00:00:52.40, start: -0.020000, bitrate: 44 kb/s
    
    Stream #1:0: Audio: opus, 48000 Hz, stereo, fltp
    
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '1_v.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.12.100
    
  Duration: 00:01:03.85, start: 0.000000, bitrate: 2644 kb/s
    
    Stream #2:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 2633 kb/s, 333 fps, 333 tbr, 10656 tbn, 666 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '2_v.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.12.100
    
  Duration: 00:00:52.32, start: 0.000000, bitrate: 861 kb/s
    
    Stream #3:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 860 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
Stream mapping:
    
  Stream #0:0 (opus) -> amix:input0
    
  Stream #1:0 (opus) -> adelay
    
  Stream #2:0 (h264) -> hstack:input0
    
  Stream #3:0 (h264) -> trim
    
  Stream #3:0 (h264) -> fifo
    
  amix -> Stream #0:0 (aac)
    
  hstack -> Stream #0:1 (libx264)
    
Press [q] to stop, [?] for help
    
[libx264 @ 0x6d21600] using SAR=1/1
    
[libx264 @ 0x6d21600] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowShuffle
    
[libx264 @ 0x6d21600] profile Constrained Baseline, level 5.1
    
[libx264 @ 0x6d21600] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=3 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=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
    
Output #0, mp4, to 'mayank_navid_bars_try2.mp4':
    
  Metadata:
    
    encoder         : Lavf58.12.100
    
    Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    
    Metadata:
    
      encoder         : Lavc58.18.100 aac
    
    Stream #0:1: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x480 [SAR 1:1 DAR 8:3], q=-1--1, 333 fps, 10656 tbn, 333 tbc (default)
    
    Metadata:
    
      encoder         : Lavc58.18.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
Past duration 0.999992 too large
    
    Last message repeated 12 times
    
More than 1000 frames duplicated   33280kB time=00:01:08.03 bitrate=4007.4kbits/s dup=982 drop=1590 speed=0.536x    
    
frame=22679 fps=177 q=-1.0 Lsize=   33892kB time=00:01:08.10 bitrate=4076.9kbits/s dup=1339 drop=1590 speed=0.531x    
    
video:32804kB audio:953kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.401324%
    
[aac @ 0x6d4c680] Qavg: 22255.799
    
[libx264 @ 0x6d21600] frame I:91    Avg QP:15.31  size: 51639
    
[libx264 @ 0x6d21600] frame P:22588 Avg QP:18.24  size:  1279
    
[libx264 @ 0x6d21600] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 0x6d21600] mb P  I16..4:  0.2%  0.0%  0.0%  P16..4: 13.0%  0.0%  0.0%  0.0%  0.0%    skip:86.8%
    
[libx264 @ 0x6d21600] coded y,uvDC,uvAC intra: 44.9% 54.0% 29.9% inter: 2.0% 10.9% 0.1%
    
[libx264 @ 0x6d21600] i16 v,h,dc,p: 45% 24% 13% 18%
    
[libx264 @ 0x6d21600] i8c dc,h,v,p: 51% 20% 18% 11%
    
[libx264 @ 0x6d21600] kb/s:3945.79

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