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Sur d’autres sites (2773)

  • Complie FFMpeg with Xcode5 preview's clang

    2 août 2013, par Yeung

    With release of IOS7 beta, I would like to try compiling ffmpeg for ios7.

    There is a lots answer like this. It use the llvm-gcc as compiler.

    However, seem like Xcode 5 would not include llvm-gcc. Then I have no choice but to use clang to compile.

    I use the following to config :

    export IOS_SDK="/Applications/Xcode5-DP4.app/Contents/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk"
    

    
./configure $CONFIG_DISABLE_FLAG $CONFIG_ENABLE_FLAG \
    
--arch=arm \
    
--target-os=darwin \
    
--cc=/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang \
    
--as='gas-preprocessor.pl /Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' \
    
--ar=/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar  \
    
--sysroot=$IOS_SDK \
    
--cpu=cortex-a8 \
    
--extra-cflags="-arch armv7 -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot ${IOS_SDK} -I${IOS_SDK}/usr/include" \
    
--extra-ldflags="-arch armv7 -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot ${IOS_SDK} -L${IOS_SDK}/usr/lib" \
    
--enable-pic

    clang would probably not take CFLAGS other than -arch  -isysroot -I into account, but let it be.

    I seems it can complie but I encounter this. Actually, I don't understand the answer in this question. Using the external assembler ? Yes, the toolchains do have a assembler stated it is GNU version 1.38. Using --as=/Application/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as, it even cannot pass the check as test. It fall back to use 'gas-preprocessor.pl $CC'

    Here is the config log to cannot pass :

        check_asm armv6t2 "movt r0, #0"
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("movt r0, #0"); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm armvfp "fadds s0, s0, s0"
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("fadds s0, s0, s0"); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm neon "vadd.i16 q0, q0, q0"
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("vadd.i16 q0, q0, q0"); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm vfpv3 "vmov.f32 s0, #1.0"
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("vmov.f32 s0, #1.0"); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm asm_mod_y "vmul.i32 d0, d0, %y0" :: "x"(0)
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("vmul.i32 d0, d0, %y0" :: "x"(0)); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm gnu_as ".macro m n
    
\n:.int 0
    
.endm
    
m x"

    Yep, with config --disable-asm would complie but it probably not a option.

  • Issue in CV_FOURCC('H', '2', '6', '4')

    16 décembre 2014, par Ashwin

    I am trying to use H264 encoding type for compressing the live streaming from Camera (which is supporting the H264 codec) am getting below -
    [I am using OPENCV 3.0 beta version (latest)in windows 7 64 bit system .My camera is also supporting H264 codec (find more details below) ]
    My ffmpeg code got built with h264 lib :
    This build was compiled with the following external libraries :
    x264 20140826-git-dd79a61 http://videolan.org/developers/x264.html

    **error :**
    

    
Frame size = 1280x720
    
Could not find encoder for codec id 28: Encoder not foundERROR: Failed to write the video
    
Press any key to continue . . .

    Below is my code :

    int main(int argc, char *argv[])
    
{
    
 // QApplication a(argc, argv);
    

    
  VideoCapture cap(0); //capture webcam
    

    
  if (!cap.isOpened()) //if not successful then exit
    
  {
    
    cout << "Cannot open webcam";
    
    return -1;
    
  }
    

    
  namedWindow("Camera feed", 1); //create window
    

    
  cap.set(3, 1280);
    
  cap.set(4, 720);
    

    
  double dWidth  = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get width of frames of video
    
  double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get height of frames of video    
    

    

    
  Size frameSize(static_cast<int>(dWidth), static_cast<int>(dHeight));
    

    
  cout &lt;&lt; "Frame size = " &lt;&lt; dWidth &lt;&lt; "x" &lt;&lt; dHeight &lt;&lt; endl;
    

    
  VideoWriter oVideoWriter("video.avi", CV_FOURCC('X', '2', '6', '4'), 30, frameSize);
    

    
  if(!oVideoWriter.isOpened())
    
  {
    
    cout &lt;&lt; "ERROR: Failed to write the video" &lt;&lt; endl;
    
    return -1;
    
  }
    
  while(1)
    
  {
    
    Mat frame;
    
    bool bSuccess = cap.read(frame); //read a new frame from video
    

    
    if(!bSuccess) //if unsuccessful, break loop
    
    {
    
        cout &lt;&lt; "Cannot read frame from video file" &lt;&lt; endl;
    
        break;
    
    }
    

    
    oVideoWriter.write(frame); //write the frame into the file
    
    imshow("Camera feed", frame); //show the frame in "Live Feed" window
    

    
    cout &lt;&lt; "Recording" &lt;&lt; endl;
    

    
    if (waitKey(30) == 27)
    

    
    {
    
      cout&lt;&lt; "Esc key is pressed by user" &lt;&lt; endl;
    
      break;
    
    }
    

    
  }
    
  return 0;
    
}
    
</int></int>

    Here is the proof that my camera is supporting the H264 :

    C:\Users>ffmpeg -f dshow -list_options true -i video="Logitech HD Pro Webcam C920"
    
ffmpeg version N-66116-g720c21d Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep  4 2014 22:09:48 with gcc 4.8.3 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
    
  libavutil      54.  7.100 / 54.  7.100
    
  libavcodec     56.  1.100 / 56.  1.100
    
  libavformat    56.  4.100 / 56.  4.100
    
  libavdevice    56.  0.100 / 56.  0.100
    
  libavfilter     5.  0.103 /  5.  0.103
    
  libswscale      3.  0.100 /  3.  0.100
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  0.100 / 53.  0.100
    
[dshow @ 0000000002faf680] DirectShow video device options
    
[dshow @ 0000000002faf680]  Pin "Capture"
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=2304x1296 fps=2 max s=2304x1296 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=2304x1536 fps=2 max s=2304x1536 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=2304x1296 fps=2 max s=2304x1296 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=2304x1536 fps=2 max s=2304x1536 fps=2
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]  Pin "Capture"
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
video=Logitech HD Pro Webcam C920: Immediate exit requested

  • Concatenate chunk containg headers to another chunk in h264

    18 novembre 2014, par Ortixx

    I’m trying to extract thumbnails from a torrent stream by downloading the first couple of chunks to get the headers, another set of chunks from the middle and then concat them to have a single video file.

    For this I’m using nodejs but I’m having trouble with the concatenation part. Obviously the headers include the length of the video so if I simply concat another chunk to the end of the headers chunk, it won’t work.

    In other words, I have 2 chunks of a video file : The first one contains the headers and some material and the other one is fully composed of a video stream. I want to combine the two to form a single video file
    So my question is how can I make this work properly if at all ?

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