Recherche avancée

Médias (1)

Mot : - Tags -/swfupload

Autres articles (70)

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

  • Librairies et binaires spécifiques au traitement vidéo et sonore

    31 janvier 2010, par

    Les logiciels et librairies suivantes sont utilisées par SPIPmotion d’une manière ou d’une autre.
    Binaires obligatoires FFMpeg : encodeur principal, permet de transcoder presque tous les types de fichiers vidéo et sonores dans les formats lisibles sur Internet. CF ce tutoriel pour son installation ; Oggz-tools : outils d’inspection de fichiers ogg ; Mediainfo : récupération d’informations depuis la plupart des formats vidéos et sonores ;
    Binaires complémentaires et facultatifs flvtool2 : (...)

Sur d’autres sites (5191)

  • OpenCV VideoWriter using ffmpeg with "Could not open codec 'libx264'" Error

    28 septembre 2016, par user2262504

    I am new to OpenCV, and I want write Mat images into video using VideoWriter on Ubuntu 12.04. But when constructing VideoWriter, errors came out.

    It seems that OpenCV invoke ffmpeg API using default parameters and ffmpeg invoke x264 using its default parameters. Then these setting is broken for libx264. Thus the "Could not open codec ’libx264’" error.

    Anyone has ideas to solve this problem ?

    More specifically :

    1. anyone knows where and how OpenCV invoke ffmpeg API ?
    2. how to change ffmpeg default settings using code, hopefull, can be easily embeded into OpenCV ?
    3. will changes of default in ffmpeg be carried to libx264 ?

    Errors :

    1. Uising CV_FOURCC('H', '2', '6', '4')
    
[libx264 @ 0x255de40] broken ffmpeg default settings detected
    
[libx264 @ 0x255de40] use an encoding preset (e.g. -vpre medium)
    
[libx264 @ 0x255de40] preset usage: -vpre <speed> -vpre <profile>
    
[libx264 @ 0x255de40] speed presets are listed in x264 --help
    
[libx264 @ 0x255de40] profile is optional; x264 defaults to high
    
Could not open codec 'libx264': Unspecified error
    

    
2. Using FOURCC = -1 to invoke user customized codec
    
OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv 
    
backend doesn't support this codec acutally.) in CvVideoWriter_GStreamer::open, 
    
file /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp, 
    
line 505 terminate called after throwing an instance of 'cv::Exception'
    
what():  /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp:
    
505: error: (-210) Gstreamer Opencv backend doesn't support this codec acutally.
    
in function CvVideoWriter_GStreamer::open
    
</profile></speed>

    Codes :

    int main(int argc, char *argv[])
    
{
    
    VideoWriter outputVideo;
    
    bool fourcc_on = true; //switch on / off different error
    
    if (fourcc_on)
    
        outputVideo.open("outVideo.avi", CV_FOURCC('H', '2', '6', '4'), 25, Size(100, 100), true);
    
    else
    
        outputVideo.open("outVideo.avi", -1, 25, Size(100, 100), true);
    

    
    if (!outputVideo.isOpened())
    
    {
    
        cout  &lt;&lt; "Could not open the output video for write" &lt;&lt; endl;
    
        return -1;
    
    }
    
    return 0;
    
}

    OpenCV Configuration :

    -- Detected version of GNU GCC: 46 (406)
    
-- Found OpenEXR: /usr/lib/libIlmImf.so
    
-- Looking for linux/videodev.h
    
-- Looking for linux/videodev.h - not found
    
-- Looking for linux/videodev2.h
    
-- Looking for linux/videodev2.h - found
    
-- Looking for sys/videoio.h
    
-- Looking for sys/videoio.h - not found
    
-- Looking for libavformat/avformat.h
    
-- Looking for libavformat/avformat.h - found
    
-- Looking for ffmpeg/avformat.h
    
-- Looking for ffmpeg/avformat.h - not found
    
-- Could NOT find JNI (missing:  JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
    
-- 
    
-- General configuration for OpenCV 2.4.8 =====================================
    
--   Version control:               unknown
    
-- 
    
--   Platform:
    
--     Host:                        Linux 3.8.0-38-generic x86_64
    
--     CMake:                       2.8.7
    
--     CMake generator:             Unix Makefiles
    
--     CMake build tool:            /usr/bin/make
    
--     Configuration:               RELEASE
    
-- 
    
--   C/C++:
    
--     Built as dynamic libs?:      YES
    
--     C++ Compiler:                /usr/bin/c++  (ver 4.6)
    
--     C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG
    
--     C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG
    
--     C Compiler:                  /usr/bin/gcc
    
--     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG
    
--     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG
    
--     Linker flags (Release):      
    
--     Linker flags (Debug):        
    
--     Precompiled headers:         YES
    
-- 
    
--   OpenCV modules:
    
--     To be built:                 core flann imgproc highgui features2d calib3d ml video legacy objdetect photo gpu ocl nonfree contrib python stitching superres ts videostab
    
--     Disabled:                    world
    
--     Disabled by dependency:      -
    
--     Unavailable:                 androidcamera dynamicuda java
    
-- 
    
--   GUI: 
    
--     QT:                          NO
    
--     GTK+ 2.x:                    YES (ver 2.24.10)
    
--     GThread :                    YES (ver 2.32.4)
    
--     GtkGlExt:                    NO
    
--     OpenGL support:              NO
    
-- 
    
--   Media I/O: 
    
--     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.3.4)
    
--     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
    
--     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.46)
    
--     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 3.9.5)
    
--     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
    
--     OpenEXR:                     /usr/lib/libImath.so /usr/lib/libIlmImf.so /usr/lib/libIex.so /usr/lib/libHalf.so /usr/lib/libIlmThread.so (ver 1.6.1)
    
-- 
    
--   Video I/O:
    
--     DC1394 1.x:                  NO
    
--     DC1394 2.x:                  YES (ver 2.2.0)
    
--     FFMPEG:                      YES
    
--       codec:                     YES (ver 55.58.105)
    
--       format:                    YES (ver 55.37.101)
    
--       util:                      YES (ver 52.78.100)
    
--       swscale:                   YES (ver 2.6.100)
    
--       gentoo-style:              YES
    
--     GStreamer:                   
    
--       base:                      YES (ver 0.10.36)
    
--       app:                       YES (ver 0.10.36)
    
--       video:                     YES (ver 0.10.36)
    
--     OpenNI:                      NO
    
--     OpenNI PrimeSensor Modules:  NO
    
--     PvAPI:                       NO
    
--     GigEVisionSDK:               NO
    
--     UniCap:                      NO
    
--     UniCap ucil:                 NO
    
--     V4L/V4L2:                    Using libv4l (ver 1.0.1)
    
--     XIMEA:                       NO
    
--     Xine:                        NO
    
-- 
    
--   Other third-party libraries:
    
--     Use IPP:                     NO
    
--     Use Eigen:                   NO
    
--     Use TBB:                     NO
    
--     Use OpenMP:                  NO
    
--     Use GCD                      NO
    
--     Use Concurrency              NO
    
--     Use C=:                      NO
    
--     Use Cuda:                    NO
    
--     Use OpenCL:                  YES
    
-- 
    
--   OpenCL:
    
--     Version:                     dynamic
    
--     Include path:                /home/shixudongleo/Downloads/opencv-2.4.8/3rdparty/include/opencl/1.2
    
--     Use AMD FFT:                 NO
    
--     Use AMD BLAS:                NO
    
-- 
    
--   Python:
    
--     Interpreter:                 /usr/bin/python (ver 2.7.3)
    
--     Libraries:                   /usr/lib/libpython2.7.so
    
--     numpy:                       /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.6.1)
    
--     packages path:               lib/python2.7/dist-packages
    
-- 
    
--   Java:
    
--     ant:                         NO
    
--     JNI:                         NO
    
--     Java tests:                  NO
    
-- 
    
--   Documentation:
    
--     Build Documentation:         NO
    
--     Sphinx:                      NO
    
--     PdfLaTeX compiler:           /usr/bin/pdflatex
    
-- 
    
--   Tests and samples:
    
--     Tests:                       YES
    
--     Performance tests:           YES
    
--     C/C++ Examples:              NO
    
-- 
    
--   Install path:                  /usr/local
    
-- 
    
--   cvconfig.h is in:              /home/shixudongleo/Downloads/opencv-2.4.8/build
    
-- -----------------------------------------------------------------
    
-- 
    
-- Configuring done
    
-- Generating done
    
-- Build files have been written to: /home/XXX/Downloads/opencv-2.4.8/build

    FFMPEG

    ffmpeg is enable to support OpenCV and libx264 is enabled when compiling ffmpeg.
    By using ffmpeg command line, libx264 is running normally.

    $ ffmpeg -i test.avi -vcodec libx264 test.mp4
    
ffmpeg -i test.avi -vcodec libx264 test.mp4 > ~/Downloads/ffmpeg_log.txt
    
ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Apr 24 2014 16:39:51 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
    
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-shared --enable-pic
    
  libavutil      52. 78.100 / 52. 78.100
    
  libavcodec     55. 58.105 / 55. 58.105
    
  libavformat    55. 37.101 / 55. 37.101
    
  libavdevice    55. 13.100 / 55. 13.100
    
  libavfilter     4.  4.100 /  4.  4.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, avi, from 'test.avi':
    
  Duration: 00:00:03.73, start: 0.000000, bitrate: 1757 kb/s
    
    Stream #0:0: Video: msvideo1 (CRAM / 0x4D415243), rgb555le, 320x240, 1781 kb/s, 15 tbr, 15 tbn, 15 tbc
    
    Metadata:
    
      title           : julius.avi Video #1
    
File 'test.mp4' already exists. Overwrite ? [y/N] y
    
No pixel format specified, yuv444p for H.264 encoding chosen.
    
Use -pix_fmt yuv420p for compatibility with outdated media players.
    
[libx264 @ 0x25d08e0] using cpu capabilities: none!
    
[libx264 @ 0x25d08e0] profile High 4:4:4 Predictive, level 1.2, 4:4:4 8-bit
    
[libx264 @ 0x25d08e0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=4 threads=12 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=15 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 'test.mp4':
    
  Metadata:
    
    encoder         : Lavf55.37.101
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 320x240, q=-1--1, 15360 tbn, 15 tbc
    
    Metadata:
    
      title           : julius.avi Video #1
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (msvideo1 -> libx264)
    
Press [q] to stop, [?] for help
    
frame=   56 fps=0.0 q=-1.0 Lsize=     321kB time=00:00:03.60 bitrate= 731.0kbits/s    
    
video:320kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.409949%
    
[libx264 @ 0x25d08e0] frame I:3     Avg QP:15.36  size:  7975
    
[libx264 @ 0x25d08e0] frame P:38    Avg QP:26.05  size:  6230
    
[libx264 @ 0x25d08e0] frame B:15    Avg QP:28.25  size:  4418
    
[libx264 @ 0x25d08e0] consecutive B-frames: 46.4% 53.6%  0.0%  0.0%
    
[libx264 @ 0x25d08e0] mb I  I16..4:  1.4% 72.8% 25.8%
    
[libx264 @ 0x25d08e0] mb P  I16..4:  1.6%  5.7% 15.1%  P16..4:  7.6%  6.3%  7.4%  0.0%  0.0%    skip:56.3%
    
[libx264 @ 0x25d08e0] mb B  I16..4:  0.2%  1.0%  2.0%  B16..8: 13.3%  7.8%  8.7%  direct: 8.3%  skip:58.8%  L0:34.9% L1:36.6% BI:28.5%
    
[libx264 @ 0x25d08e0] 8x8 transform intra:37.7% inter:2.3%
    
[libx264 @ 0x25d08e0] coded y,u,v intra: 52.1% 42.1% 30.1% inter: 19.6% 9.2% 5.2%
    
[libx264 @ 0x25d08e0] i16 v,h,dc,p: 56% 17% 24%  2%
    
[libx264 @ 0x25d08e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 16% 68%  1%  1%  1%  1%  1%  1%
    
[libx264 @ 0x25d08e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 28%  5%  6%  5%  7%  5%  6%
    
[libx264 @ 0x25d08e0] Weighted P-Frames: Y:31.6% UV:21.1%
    
[libx264 @ 0x25d08e0] ref P L0: 70.5%  9.0% 12.1%  6.5%  2.0%
    
[libx264 @ 0x25d08e0] ref B L0: 91.3%  8.7%
    
[libx264 @ 0x25d08e0] kb/s:700.56

  • OpenCV VideoWriter using ffmpeg with "Could not open codec 'libx264'" Error

    28 septembre 2016, par user2262504

    I am new to OpenCV, and I want write Mat images into video using VideoWriter on Ubuntu 12.04. But when constructing VideoWriter, errors came out.

    It seems that OpenCV invoke ffmpeg API using default parameters and ffmpeg invoke x264 using its default parameters. Then these setting is broken for libx264. Thus the "Could not open codec ’libx264’" error.

    Anyone has ideas to solve this problem ?

    More specifically :

    1. anyone knows where and how OpenCV invoke ffmpeg API ?
    2. how to change ffmpeg default settings using code, hopefull, can be easily embeded into OpenCV ?
    3. will changes of default in ffmpeg be carried to libx264 ?

    Errors :

    1. Uising CV_FOURCC('H', '2', '6', '4')
    
[libx264 @ 0x255de40] broken ffmpeg default settings detected
    
[libx264 @ 0x255de40] use an encoding preset (e.g. -vpre medium)
    
[libx264 @ 0x255de40] preset usage: -vpre <speed> -vpre <profile>
    
[libx264 @ 0x255de40] speed presets are listed in x264 --help
    
[libx264 @ 0x255de40] profile is optional; x264 defaults to high
    
Could not open codec 'libx264': Unspecified error
    

    
2. Using FOURCC = -1 to invoke user customized codec
    
OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv 
    
backend doesn't support this codec acutally.) in CvVideoWriter_GStreamer::open, 
    
file /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp, 
    
line 505 terminate called after throwing an instance of 'cv::Exception'
    
what():  /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp:
    
505: error: (-210) Gstreamer Opencv backend doesn't support this codec acutally.
    
in function CvVideoWriter_GStreamer::open
    
</profile></speed>

    Codes :

    int main(int argc, char *argv[])
    
{
    
    VideoWriter outputVideo;
    
    bool fourcc_on = true; //switch on / off different error
    
    if (fourcc_on)
    
        outputVideo.open("outVideo.avi", CV_FOURCC('H', '2', '6', '4'), 25, Size(100, 100), true);
    
    else
    
        outputVideo.open("outVideo.avi", -1, 25, Size(100, 100), true);
    

    
    if (!outputVideo.isOpened())
    
    {
    
        cout  &lt;&lt; "Could not open the output video for write" &lt;&lt; endl;
    
        return -1;
    
    }
    
    return 0;
    
}

    OpenCV Configuration :

    -- Detected version of GNU GCC: 46 (406)
    
-- Found OpenEXR: /usr/lib/libIlmImf.so
    
-- Looking for linux/videodev.h
    
-- Looking for linux/videodev.h - not found
    
-- Looking for linux/videodev2.h
    
-- Looking for linux/videodev2.h - found
    
-- Looking for sys/videoio.h
    
-- Looking for sys/videoio.h - not found
    
-- Looking for libavformat/avformat.h
    
-- Looking for libavformat/avformat.h - found
    
-- Looking for ffmpeg/avformat.h
    
-- Looking for ffmpeg/avformat.h - not found
    
-- Could NOT find JNI (missing:  JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
    
-- 
    
-- General configuration for OpenCV 2.4.8 =====================================
    
--   Version control:               unknown
    
-- 
    
--   Platform:
    
--     Host:                        Linux 3.8.0-38-generic x86_64
    
--     CMake:                       2.8.7
    
--     CMake generator:             Unix Makefiles
    
--     CMake build tool:            /usr/bin/make
    
--     Configuration:               RELEASE
    
-- 
    
--   C/C++:
    
--     Built as dynamic libs?:      YES
    
--     C++ Compiler:                /usr/bin/c++  (ver 4.6)
    
--     C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG
    
--     C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG
    
--     C Compiler:                  /usr/bin/gcc
    
--     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG
    
--     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG
    
--     Linker flags (Release):      
    
--     Linker flags (Debug):        
    
--     Precompiled headers:         YES
    
-- 
    
--   OpenCV modules:
    
--     To be built:                 core flann imgproc highgui features2d calib3d ml video legacy objdetect photo gpu ocl nonfree contrib python stitching superres ts videostab
    
--     Disabled:                    world
    
--     Disabled by dependency:      -
    
--     Unavailable:                 androidcamera dynamicuda java
    
-- 
    
--   GUI: 
    
--     QT:                          NO
    
--     GTK+ 2.x:                    YES (ver 2.24.10)
    
--     GThread :                    YES (ver 2.32.4)
    
--     GtkGlExt:                    NO
    
--     OpenGL support:              NO
    
-- 
    
--   Media I/O: 
    
--     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.3.4)
    
--     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
    
--     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.46)
    
--     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 3.9.5)
    
--     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
    
--     OpenEXR:                     /usr/lib/libImath.so /usr/lib/libIlmImf.so /usr/lib/libIex.so /usr/lib/libHalf.so /usr/lib/libIlmThread.so (ver 1.6.1)
    
-- 
    
--   Video I/O:
    
--     DC1394 1.x:                  NO
    
--     DC1394 2.x:                  YES (ver 2.2.0)
    
--     FFMPEG:                      YES
    
--       codec:                     YES (ver 55.58.105)
    
--       format:                    YES (ver 55.37.101)
    
--       util:                      YES (ver 52.78.100)
    
--       swscale:                   YES (ver 2.6.100)
    
--       gentoo-style:              YES
    
--     GStreamer:                   
    
--       base:                      YES (ver 0.10.36)
    
--       app:                       YES (ver 0.10.36)
    
--       video:                     YES (ver 0.10.36)
    
--     OpenNI:                      NO
    
--     OpenNI PrimeSensor Modules:  NO
    
--     PvAPI:                       NO
    
--     GigEVisionSDK:               NO
    
--     UniCap:                      NO
    
--     UniCap ucil:                 NO
    
--     V4L/V4L2:                    Using libv4l (ver 1.0.1)
    
--     XIMEA:                       NO
    
--     Xine:                        NO
    
-- 
    
--   Other third-party libraries:
    
--     Use IPP:                     NO
    
--     Use Eigen:                   NO
    
--     Use TBB:                     NO
    
--     Use OpenMP:                  NO
    
--     Use GCD                      NO
    
--     Use Concurrency              NO
    
--     Use C=:                      NO
    
--     Use Cuda:                    NO
    
--     Use OpenCL:                  YES
    
-- 
    
--   OpenCL:
    
--     Version:                     dynamic
    
--     Include path:                /home/shixudongleo/Downloads/opencv-2.4.8/3rdparty/include/opencl/1.2
    
--     Use AMD FFT:                 NO
    
--     Use AMD BLAS:                NO
    
-- 
    
--   Python:
    
--     Interpreter:                 /usr/bin/python (ver 2.7.3)
    
--     Libraries:                   /usr/lib/libpython2.7.so
    
--     numpy:                       /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.6.1)
    
--     packages path:               lib/python2.7/dist-packages
    
-- 
    
--   Java:
    
--     ant:                         NO
    
--     JNI:                         NO
    
--     Java tests:                  NO
    
-- 
    
--   Documentation:
    
--     Build Documentation:         NO
    
--     Sphinx:                      NO
    
--     PdfLaTeX compiler:           /usr/bin/pdflatex
    
-- 
    
--   Tests and samples:
    
--     Tests:                       YES
    
--     Performance tests:           YES
    
--     C/C++ Examples:              NO
    
-- 
    
--   Install path:                  /usr/local
    
-- 
    
--   cvconfig.h is in:              /home/shixudongleo/Downloads/opencv-2.4.8/build
    
-- -----------------------------------------------------------------
    
-- 
    
-- Configuring done
    
-- Generating done
    
-- Build files have been written to: /home/XXX/Downloads/opencv-2.4.8/build

    FFMPEG

    ffmpeg is enable to support OpenCV and libx264 is enabled when compiling ffmpeg.
    By using ffmpeg command line, libx264 is running normally.

    $ ffmpeg -i test.avi -vcodec libx264 test.mp4
    
ffmpeg -i test.avi -vcodec libx264 test.mp4 > ~/Downloads/ffmpeg_log.txt
    
ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Apr 24 2014 16:39:51 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
    
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-shared --enable-pic
    
  libavutil      52. 78.100 / 52. 78.100
    
  libavcodec     55. 58.105 / 55. 58.105
    
  libavformat    55. 37.101 / 55. 37.101
    
  libavdevice    55. 13.100 / 55. 13.100
    
  libavfilter     4.  4.100 /  4.  4.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, avi, from 'test.avi':
    
  Duration: 00:00:03.73, start: 0.000000, bitrate: 1757 kb/s
    
    Stream #0:0: Video: msvideo1 (CRAM / 0x4D415243), rgb555le, 320x240, 1781 kb/s, 15 tbr, 15 tbn, 15 tbc
    
    Metadata:
    
      title           : julius.avi Video #1
    
File 'test.mp4' already exists. Overwrite ? [y/N] y
    
No pixel format specified, yuv444p for H.264 encoding chosen.
    
Use -pix_fmt yuv420p for compatibility with outdated media players.
    
[libx264 @ 0x25d08e0] using cpu capabilities: none!
    
[libx264 @ 0x25d08e0] profile High 4:4:4 Predictive, level 1.2, 4:4:4 8-bit
    
[libx264 @ 0x25d08e0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=4 threads=12 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=15 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 'test.mp4':
    
  Metadata:
    
    encoder         : Lavf55.37.101
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 320x240, q=-1--1, 15360 tbn, 15 tbc
    
    Metadata:
    
      title           : julius.avi Video #1
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (msvideo1 -> libx264)
    
Press [q] to stop, [?] for help
    
frame=   56 fps=0.0 q=-1.0 Lsize=     321kB time=00:00:03.60 bitrate= 731.0kbits/s    
    
video:320kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.409949%
    
[libx264 @ 0x25d08e0] frame I:3     Avg QP:15.36  size:  7975
    
[libx264 @ 0x25d08e0] frame P:38    Avg QP:26.05  size:  6230
    
[libx264 @ 0x25d08e0] frame B:15    Avg QP:28.25  size:  4418
    
[libx264 @ 0x25d08e0] consecutive B-frames: 46.4% 53.6%  0.0%  0.0%
    
[libx264 @ 0x25d08e0] mb I  I16..4:  1.4% 72.8% 25.8%
    
[libx264 @ 0x25d08e0] mb P  I16..4:  1.6%  5.7% 15.1%  P16..4:  7.6%  6.3%  7.4%  0.0%  0.0%    skip:56.3%
    
[libx264 @ 0x25d08e0] mb B  I16..4:  0.2%  1.0%  2.0%  B16..8: 13.3%  7.8%  8.7%  direct: 8.3%  skip:58.8%  L0:34.9% L1:36.6% BI:28.5%
    
[libx264 @ 0x25d08e0] 8x8 transform intra:37.7% inter:2.3%
    
[libx264 @ 0x25d08e0] coded y,u,v intra: 52.1% 42.1% 30.1% inter: 19.6% 9.2% 5.2%
    
[libx264 @ 0x25d08e0] i16 v,h,dc,p: 56% 17% 24%  2%
    
[libx264 @ 0x25d08e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 16% 68%  1%  1%  1%  1%  1%  1%
    
[libx264 @ 0x25d08e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 28%  5%  6%  5%  7%  5%  6%
    
[libx264 @ 0x25d08e0] Weighted P-Frames: Y:31.6% UV:21.1%
    
[libx264 @ 0x25d08e0] ref P L0: 70.5%  9.0% 12.1%  6.5%  2.0%
    
[libx264 @ 0x25d08e0] ref B L0: 91.3%  8.7%
    
[libx264 @ 0x25d08e0] kb/s:700.56

  • Further Dreamcast Hacking

    3 février 2011, par Multimedia Mike — Sega Dreamcast

    I’m still haunted by Sega Dreamcast programming, specifically the fact that I used to be able to execute custom programs on the thing (roughly 8-10 years ago) and now I cannot. I’m going to compose a post to describe my current adventures on this front. There are 3 approaches I have been using : Raw, Kallistios, and the almighty Linux.


    Raw
    What I refer to as "raw" is an assortment of programs that lived in a small number of source files (sometimes just one ASM file) and could be compiled with the most basic SH-4 toolchain. The advantage here is that there aren’t many moving parts and not many things that can possibly go wrong, so it provides a good functional baseline.

    One of the original Dreamcast hackers was Marcus Comstedt, who still has his original DC material hosted at the reasonably easy-to-remember URL mc.pp.se/dc. I can get some of these simple demos to work, but not others.

    I also successfully assembled and ran a pair of 256-byte (!!) demos from this old DC scene page.

    KallistiOS
    KallistiOS (or just KOS) was a real-time OS developed for the DC and was popular among the DC homebrew community. All the programming I did back in the day was based around KOS. Now I can’t get any of it to work. More specifically, KOS can’t seem to make it past a certain point in its system initialization.

    The Linux Option
    I was never that excited about running Linux on my Dreamcast. For some hackers, running Linux on a given piece of consumer electronics is the highest attainable goal. Back in the day, I looked at it from a much more pragmatic perspective— I didn’t see much use in running Linux on the DC, not as much as running KOS which was developed to be a much more appropriate fit.

    However, I was able to burn a CD-R of an old binary image of Linux 2.4.5 compiled for the Dreamcast and boot it some months ago. So I at least have a feeling that this should work. I have never cross-compiled a kernel of my own (though I have compiled many, many x86 kernels in my time, so I’m not a total n00b in this regard). I figured this might be a good time to start.

    The first item that worries me is getting a functional cross-compiling toolchain. Fortunately, a little digging in the Linux kernel documentation pointed me in the direction of a bunch of ready-made toolchains hosted at kernel.org. So I grabbed one of the SH toolchains (gcc-4.3.3-nolibc) and got rolling.

    I’m well familiar with the cycle of 'make menuconfig' in order to pick configuration options, and then 'make' to build a kernel (or usually 'make zImage' or 'make bzImage' to create compressed images). For cross compiling, the primary difference seems to be editing the root Makefile in the Linux source code tree (I’m using 2.6.37, the latest stable as of this writing) and setting a value for the CROSS_COMPILE variable. Then, run 'make menuconfig' followed by 'make' as normal.

    The Linux 2.6 series is supposed to support a range of Renesas (formerly Hitachi) SH processors and board configurations. This includes reasonable defaults for the Sega Dreamcast hardware. I got it all compiling except for a series of .S files. Linus Torvalds once helped me debug a program I work on so I thought I’d see if there was something I could help debug here.

    The first issue was with ASM statements of a form similar to :

    mov #0xffffffe0, r1

    Now, the DC’s SH-4 is a RISC CPU. A lot of RISC architectures adopt a fixed instruction size of 32 bits. You can’t encode an entire 32-bit immediate value inside of a 32-bit instruction (there would be no room for the instruction encoding). Further, the SH series encoded instructions with a mere 16 bits. The move immediate data instruction only allows for an 8-bit, sign-extended value.

    I decided that the above statement is equivalent to :

    mov #-32, r1

    I’ll give this statement the benefit of the doubt that it used to work with the gcc toolchain somewhere along the line. I assume that the assembler is supposed to know enough to substitute the first form with the second.

    The next problem is that an ’sti’ instruction shows up in a number of spots. Using Intel x86 conventions, this is a "set interrupt flag" instruction (I remember that the 6502 CPU had the same instruction mnemonic, though its interrupt flag’s operation was opposite that of the x86). The SH-4 reference manual lists no ’sti’ instruction. When it gets to these lines, the assembler complains about immediate move instructions with too large data, like the instructions above. I’m guessing they must be macro’d to something else but I failed to find where. I commented out those lines for the time being. Probably not that smart, but I want to keep this moving for now.

    So I got the code to compile into a kernel file called ’vmlinux’. I’ve seen this file many times before but never thought about how to get it to run directly. The process has usually been to compress it and send it over to lilo or grub for loading, as that is the job of the bootloader. I have never even wondered what format the vmlinux file takes until now. It seems that ’vmlinux’ is just a plain old ELF file :

    $ file vmlinux
vmlinux : ELF 32-bit LSB executable, Renesas SH,
version 1 (SYSV), statically linked, not stripped

    The ’dc-tool’ program that uploads executables to the waiting bootloader on the Dreamcast is perfectly cool accepting ELF files (and S-record files, and raw binary files). After a very lengthy upload process, execution fails (resets the system).

    For the sake of comparison, I dusted off that Linux 2.4.5 bootable Dreamcast CD-ROM and directly uploaded the vmlinux file from that disc. That works just fine (until it’s time to go to the next loading phase, i.e., finding a filesystem). Possible issues here could include the commented ’sti’ instructions (could be that they aren’t just decoration). I’m also trying to understand the memory organization— perhaps the bootloader wants the ELF to be based at a different address. Or maybe the kernel and the bootloader don’t like each other in the first place— in this case, I need to study the bootable Linux CD-ROM to see how it’s done.

    Optimism
    Even though I’m meeting with rather marginal success, this is tremendously educational. I greatly enjoy these exercises if only for the deeper understanding they bring for the lowest-level system details.

Navigation