Recherche avancée

Médias (91)

Autres articles (71)

  • 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.

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • Contribute to a better visual interface

    13 avril 2011

    MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
    Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.

Sur d’autres sites (6692)

  • Converting RGB to YUV, + ffmpeg

    10 juillet 2012, par TheSHEEEP

    I am trying the following to record a live video from my Flash/AIR application :

    1. I take a "screenshot" (BitmapData from stage) each frame.

    2. I convert each pixel to yuv format like this (V2) :

          var file :File = new File(_appUrl + "/creation/output.raw");
      
    var fs :FileStream = new FileStream();
      
    fs.open(file, FileMode.WRITE);
      
    var finalY :ByteArray = new ByteArray();
      
    var finalU :ByteArray = new ByteArray();
      
    var finalV :ByteArray = new ByteArray();
      
    var rect :Rectangle = new Rectangle(0, 0, 600, 700);
      
    var pixels :ByteArray;
      
    var pixel :uint;
      
    var r :uint;
      
    var g :uint;
      
    var b :uint;
      
    _screenBuffer = _screenBuffer.reverse();
      
    while (_screenBuffer.length > 0)
      
    {
      
        pixels = BitmapData(_screenBuffer.pop()).getPixels(rect);
      
        pixels.position = 0;
      
        // Convert and save each pixel
      
        for (var x:int = 0; x < 600; x++)
      
        {
      
            for (var y:int = 0; y < 700; y++)
      
            {
      
                // Convert to yuv
      
                pixel = pixels.readUnsignedInt();
      
                r = pixel >> 16 & 0xff;
      
                g = pixel >> 8 & 0xff;
      
                b = pixel & 0xff;
      
                    // Y' is written for each pixel
      
                finalY.writeByte(0.257 * r + 0.504 * g + 0.098 * b + 128);
      
                    // U and V are written once per 2x2 pixel block
      
                if (x % 2 == 0 && y % 2 == 0)
      
                {
      
                    finalU.writeByte(-0.148 * r - 0.291 * g + 0.439 * b + 128);
      
                    finalV.writeByte(0.439 * r - 0.368 * g - 0.071 * b + 128);
      
                }
      
            }
      
        }
      
    }
      
    // Write the converted bytes to the file
      
    finalY.position = 0;
      
    finalU.position = 0;
      
    finalV.position = 0;
      
    fs.writeBytes(finalY, 0, finalY.length);
      
    fs.writeBytes(finalU, 0, finalU.length);
      
    fs.writeBytes(finalV, 0, finalV.length);
      
    fs.close();

    3. I use the following line of ffmpeg to convert the raw file to a video :

      ffmpeg -r 30 -pix_fmt yuv420p -s 600x700 -vcodec rawvideo -f rawvideo -i output.raw -y test.mp4

    A video is created, but it is simply a mess, barely resembling what was recorded. I know that the capturing process works, as I have tried the same BitmapData "screenshots" with the SimpleFlvWriter.

    So, either something is wrong with my conversion or with the ffmpeg line, but I have no idea.

    This is what ffmpeg outputs when creating the video, maybe it can help someone :

    libavutil      51. 39.100 / 51. 39.100
    
libavcodec     54.  3.101 / 54.  3.101
    
libavformat    54.  1.100 / 54.  1.100
    
libavdevice    53.  4.100 / 53.  4.100
    
libavfilter     2. 62.101 /  2. 62.101
    
libswscale      2.  1.100 /  2.  1.100
    
libswresample   0.  7.100 /  0.  7.100
    
libpostproc    52.  0.100 / 52.  0.100
    
[rawvideo @ 01D39FC0] Estimating duration from bitrate, this may be inaccurate
    
Input #0, rawvideo, from 'output.raw':
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 600x700, 30 tbr,
    
30 tbn, 30 tbc
    
[buffer @ 01D3FEC0] w:600 h:700 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
    
[libx264 @ 0375DB80] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE 4.2 AVX
    
[libx264 @ 0375DB80] profile High, level 3.1
    
[libx264 @ 0375DB80] 264 - core 120 r2146 bcd41db - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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 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=0rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to 'test.mp4':
    
  Metadata:
    
    encoder         : Lavf54.1.100
    
    Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 600x700, q=-1--1, 30 tbn, 30 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
    
Press [q] to stop, [?] for help
    
Truncating packet of size 630000 to 1
    
frame=   48 fps=  0 q=-1.0 Lsize=     157kB time=00:00:01.53 bitrate= 837.3kbits/s
    
video:156kB audio:0kB global headers:0kB muxing overhead 0.687626%
    
[libx264 @ 0375DB80] frame I:3     Avg QP:23.15  size: 23480
    
[libx264 @ 0375DB80] frame P:38    Avg QP:28.80  size:  2169
    
[libx264 @ 0375DB80] frame B:7     Avg QP:29.61  size:   833
    
[libx264 @ 0375DB80] consecutive B-frames: 79.2%  4.2%  0.0% 16.7%
    
[libx264 @ 0375DB80] mb I  I16..4: 41.4%  6.2% 52.4%
    
[libx264 @ 0375DB80] mb P  I16..4: 10.6%  3.3%  0.9%  P16..4: 68.4%  1.3%  1.2% 0.0%  0.0%    skip:14.2%
    
[libx264 @ 0375DB80] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 13.3%  2.2%  0.7% direct: 1.9%  skip:81.9%  L0:51.6% L1:47.4% BI: 1.0%
    
[libx264 @ 0375DB80] 8x8 transform intra:16.7% inter:31.2%
    
[libx264 @ 0375DB80] coded y,uvDC,uvAC intra: 14.7% 25.5% 22.3% inter: 1.0% 4.1% 3.4%
    
[libx264 @ 0375DB80] i16 v,h,dc,p: 87% 11%  2%  0%
    
[libx264 @ 0375DB80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 18% 75%  1%  0%  1%  1% 0%  0%
    
[libx264 @ 0375DB80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 74% 12%  1%  1%  1%  2% 1%  2%
    
[libx264 @ 0375DB80] i8c dc,h,v,p: 51% 45%  4%  1%
    
[libx264 @ 0375DB80] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0375DB80] ref P L0:  4.6%  0.4% 94.6%  0.3%
    
[libx264 @ 0375DB80] ref B L0: 96.0%  4.0%
    
[libx264 @ 0375DB80] ref B L1: 96.5%  3.5%
    
[libx264 @ 0375DB80] kb/s:793.39

    I'm not really a codec expert (just starting ;)), so I don't know what to make of most of that.

    Here is a zip that contains one of the frames and the video output. What should be visible is a green smiling pear, without any artifacts. Remember the size is 600x700 and the format yuv420. Best to view such raw image files with irfanview, IMO. Don't mind the noise, its from pushing against my microphone ;)

  • FFMpeg Combine wav and avi to mp4

    15 avril 2016, par krisph

    I am trying to combine a wav file and a avi in to a single mp4.

    I can do this with the following via php :

                        $command = 'start /B convertvid\bin\ffmpeg -nostdin -i Temp\\temp.avi -i Temp\\temp.wav -y -filter:v scale=1920:-1 -c:v libx264 -preset ultrafast -movflags faststart -crf 31 -c:a libvo_aacenc -b:a 64k Temp\\output.mp4';

    However it takes an age to complete and i need to speed it up, i was just wondering is there anything that could be done to optimize the commands to make it faster ?

    I have tried the command using just the command line and it still takes ages...

    C:\inetpub\wwwroot\Update\>convertvid\bin\ffmpeg -i Temp\temp.
    
avi -i Temp\temp.wav -y  -c:v libx264 -preset ultrafast -movflags faststart -crf
    
 31 -c:a libvo_aacenc -b:a 64k Temp\testhis.mp4
    
ffmpeg version N-74645-g4c39892 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.3 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
    
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
    
ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
    
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
    
able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
    
ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
    
 --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
    
e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
    
ble-decklink --enable-zlib
    
  libavutil      54. 31.100 / 54. 31.100
    
  libavcodec     56. 58.100 / 56. 58.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 37.100 /  5. 37.100
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, avi, from 'Temp\temp.avi':
    
  Duration: 00:01:27.00, start: 0.000000, bitrate: 97 kb/s
    
    Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 256
    
0x1024 [SAR 1:1 DAR 5:2], 98 kb/s, 0.99 fps, 0.99 tbr, 0.99 tbn, 25 tbc
    
    Metadata:
    
      title           : Esa-XVID
    
Input #1, wav, from 'Temp\temp.wav':
    
  Duration: 00:01:25.00, bitrate: 13 kb/s
    
    Stream #1:0: Audio: gsm_ms (1[0][0][0] / 0x0031), 8000 Hz, mono, s16, 13 kb/
    
s
    
[libx264 @ 03b9d3e0] using SAR=1/1
    
[libx264 @ 03b9d3e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowShu
    
ffle
    
[libx264 @ 03b9d3e0] profile Constrained Baseline, level 5.0
    
[libx264 @ 03b9d3e0] 264 - core 148 r2597 e86f3a1 - H.264/MPEG-4 AVC codec - Cop
    
yleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deb
    
lock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_rang
    
e=16 chroma_me=1 trellis=0 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 interlac
    
ed=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_m
    
in=1 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=31.0 qcomp=0.60 qpmin=0 qpma
    
x=69 qpstep=4 ip_ratio=1.40 aq=0
    
Output #0, mp4, to 'Temp\testhis.mp4':
    
  Metadata:
    
    encoder         : Lavf56.40.101
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 2560x1
    
024 [SAR 1:1 DAR 5:2], q=-1--1, 0.99 fps, 1000k tbn, 0.99 tbc
    
    Metadata:
    
      title           : Esa-XVID
    
      encoder         : Lavc56.58.100 libx264
    
    Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 8000 Hz, mo
    
no, s16, 64 kb/s
    
    Metadata:
    
      encoder         : Lavc56.58.100 libvo_aacenc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
    
  Stream #1:0 -> #0:1 (gsm_ms (native) -> aac (libvo_aacenc))
    
Press [q] to stop, [?] for help
    
frame=    9 fps=0.0 q=11.0 size=     528kB time=00:00:05.05 bitrate= 855.4kbits/
    
frame=   17 fps= 16 q=9.0 size=     791kB time=00:00:13.15 bitrate= 492.9kbits/s
    
frame=   25 fps= 16 q=10.0 size=     844kB time=00:00:21.24 bitrate= 325.6kbits/
    
frame=   35 fps= 17 q=9.0 size=     870kB time=00:00:31.36 bitrate= 227.2kbits/s
    
frame=   45 fps= 17 q=10.0 size=     890kB time=00:00:41.47 bitrate= 175.8kbits/
    
frame=   56 fps= 18 q=9.0 size=     924kB time=00:00:52.60 bitrate= 143.9kbits/s
    
frame=   67 fps= 18 q=10.0 size=     948kB time=00:01:03.73 bitrate= 121.8kbits/
    
frame=   78 fps= 19 q=10.0 size=     989kB time=00:01:14.86 bitrate= 108.2kbits/
    
[mp4 @ 03b9c8e0] Starting second pass: moving the moov atom to the beginning of
    
the file
    
frame=   85 fps= 18 q=-1.0 Lsize=    1028kB time=00:01:25.98 bitrate=  97.9kbits
    
/s dup=9 drop=0
    
video:912kB audio:111kB subtitle:0kB other streams:0kB global headers:0kB muxing
    
 overhead: 0.497861%
    
[libx264 @ 03b9d3e0] frame I:1     Avg QP:28.00  size:245528
    
[libx264 @ 03b9d3e0] frame P:84    Avg QP: 9.98  size:  8182
    
[libx264 @ 03b9d3e0] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 03b9d3e0] mb P  I16..4:  4.1%  0.0%  0.0%  P16..4:  4.9%  0.0%  0.0%
    
 0.0%  0.0%    skip:90.9%
    
[libx264 @ 03b9d3e0] coded y,uvDC,uvAC intra: 10.3% 8.6% 6.3% inter: 2.4% 1.8% 0
    
.9%
    
[libx264 @ 03b9d3e0] i16 v,h,dc,p: 80% 18%  1%  1%
    
[libx264 @ 03b9d3e0] i8c dc,h,v,p: 64% 26% 10%  1%
    
[libx264 @ 03b9d3e0] kb/s:86.79

  • Error when trying to launch ffplay on Ubuntu server 16

    18 décembre 2019, par Nicolas

    For work I need to get a video+audio link working between a machine running Ubuntu server 16 and a client machine running Ubuntu 18.04.
    On the server side we have a webcam (with a microphone) and a speaker. The idea is that the client can see and hear what happens in front of the webcam, and can talk to whoever is next to the server.

    For this purpose, I run ffserver+ffmpeg on the server side to stream video and audio (that works, the client can see and hear what happens around the server), and the client also runs ffserver+ffmpeg on a different port, so that the server can use ffplay to hear what the client says.
    Unfortunately for some reason at the moment the server cannot run ffplay. I get the following error :

     # ffplay -probesize 32 -sync ext http://localhost:8090/camera.rm
    
   ffplay version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2003-2018 the FFmpeg developers
    
   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
    
   configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enableopengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    
   libavutil      54. 31.100 / 54. 31.100
    
   libavcodec     56. 60.100 / 56. 60.100
    
   libavformat    56. 40.101 / 56. 40.101
    
   libavdevice    56.  4.100 / 56.  4.100
    
   libavfilter     5. 40.101 /  5. 40.101
    
   libavresample   2.  1.  0 /  2.  1.  0
    
   libswscale      3.  1.101 /  3.  1.101
    
   libswresample   1.  2.101 /  1.  2.101
    
   libpostproc    53.  3.100 / 53.  3.100
    
 ALSA lib pcm_dmix.c:1029:(snd_pcm_dmix_open) unable to open slave
    
 Input #0, rm, from 'http://localhost:8090/camera.rm':    0B f=0/0   
    
   Metadata:
    
     title           : 
    
     author          : 
    
     copyright       : 
    
     comment         : 
    
   Duration: 01:00:00.00, start: 0.000000, bitrate: N/A
    
     Stream #0:0: Audio: ac3 (dnet / 0x74656E64), 22050 Hz, mono, fltp, 32 kb/s
    
     Stream #0:1: Video: rv10 (RV10 / 0x30315652), yuv420p, 640x480, 2048 kb/s, 24464 fps, 24464 tbr, 1k tbn, 1k tbc
    
 SDL_OpenAudio (1 channels, 22050 Hz): 
    
 No more combinations to try, audio open failed

    To be noted : ffplay has worked in the past on this server. The only modifications that were made are that I added some feeds and streams in the ffserver.conf, but they are not even used. I tried marking my additions as comments and repeating the test, but ffplay still doesn’t work.

    My ffserver.conf file is as below :

    HTTPPort            8090
    
HTTPBindAddress     0.0.0.0
    
MaxHTTPConnections 200
    
MaxClients      100
    
MaxBandWidth    500000
    
CustomLog       -
    
#NoDaemon
    

    
<feed>
    
File            /tmp/camera.ffm
    
FileMaxSize     200M
    
</feed>
    

    
#<feed>
    
#File            /tmp/test.ffm
    
#FileMaxSize     200k
    
#</feed>
    

    
#<feed>
    
#File /tmp/audio.ffm>
    
#FileMaxSize 200M
    
#</feed>
    

    
<stream>
    
Feed camera.ffm
    
Format rm
    
AudioBitRate 32
    
VideoFrameRate 15
    
VideoIntraOnly
    
VideoBitRate 2048
    
VideoBufferSize 2048
    
VideoSize 640x480
    
VideoQMin 5
    
VideoQMax 51
    
Strict -1
    
</stream>
    

    
#<stream>
    
#Feed test.ffm
    
#AudioBitRate 32
    
#AudioChannels 1
    
#AudioSampleRate 44100
    
#VideoBitRate 512
    
#VideoBufferSize 40
    
#VideoFrameRate 24
    
#VideoSize 640x640
    
#VideoGopSize 12
    
#VideoQMin 1
    
#VideoQMax 15
    
#</stream>
    

    
#<stream>
    
#Feed audio.ffm
    
#Format rm
    
#AudioBitRate 128
    
#NoVideo
    
#</stream>

    And I use the following commands :

    On the server side : ffserver -f /etc/ffserver.conf

    and : ffmpeg -f v4l2 -i /dev/video0 -f alsa -ac 2 -i hw:0 http://localhost:8090/camera.ffm

    and to receive audio : ffplay -probesize 32 -sync ext http://10.1.0.244:8080/audio.ra

    And on the client side : ffserver -f /etc/ffserver.conf

    and : ffmpeg -f alsa -ac 2 -i hw:0 http://localhost:8080/audio.ffm

    The two ffserver.conf files (on server and client) are identical, apart for the port which is different (8090 on the server and 8080 on the client).

    Does anyone have any idea why ffplay won’t start on my server ?
    Thanks,
    Nicolas.

Navigation