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    26 avril 2011, par

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    25 avril 2011, par

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    29 avril 2011, par

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  • ffmpeg can't access to usb webcam from python subprocess.Popen in windows

    29 avril 2021, par Tomez

    If I run the following ffmpeg command from windows cmd it works

    


    ffmpeg -f dshow -i video="USB Video Device" -s 1280x720 -f rawvideo -pix_fmt rgb24 pipe:


    


    I then tried to execute the same in python
    
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32

    


    args = [
    'ffmpeg', '-f', 'dshow', '-i', 'video=USB Video Device', '-s', '1280x720',
    '-f', 'rawvideo', '-pix_fmt','rgb24', 'pipe:'
]
ffmpeg_proc = subprocess.Popen(args, stdout=subprocess.PIPE)


    


    but I get this error

    


    D:\Projects\Applications\VideoCapture\Virtualenv\Scripts\python.exe D:/Projects/Applications/VideoCapture/Sources/Application/video_capture.py "USB Video Device" 1280 720
ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, dshow, from 'video=USB Video Device':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
video=USB Video Device: I/O error
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, q=2-31, 663552 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc58.134.100 rawvideo
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


    


    The inportant row is USB Video Device : I/O error
    
I've tried also to add shell=True to the Popen but with the same result.

    


    Doing some tests I found that using pycharm debug mode or simply lunching the same code inside "Pycharm Python Console" no more I/O error and all seems to work. I think something changes in the environment created for the subrocess but I wasn't able to understand what PyCharm is doing under the hood.

    


    Here the output inside PyCharm Python Console

    


    D:\Projects\Applications\VideoCapture\Virtualenv\Scripts\python.exe "C:\Program Files\JetBrains\PyCharm Community Edition 2019.1.1\plugins\python-ce\helpers\pydev\pydevconsole.py" --mode=client --port=65058
import sys; print('Python %s on %s' % (sys.version, sys.platform))
sys.path.extend(['D:\\Projects\\Applications\\VideoCapture', 'D:\\Projects\\Applications\\VideoCapture\\Sources\\Application', 'D:\\Projects\\Applications\\VideoCapture\\Sources\\Compiler', 'D:/Projects/Applications/VideoCapture'])
PyDev console: starting.
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32
runfile('D:/Projects/Applications/VideoCapture/Sources/Application/video_capture.py', args=['USB Video Device', '1280', '720'], wdir='D:/Projects/Applications/VideoCapture/Sources/Application')
ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, dshow, from 'video=USB Video Device':
  Duration: N/A, start: 111984.462000, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24(pc, progressive), 1280x720, q=2-31, 663552 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc58.134.100 rawvideo
av_interleaved_write_frame(): Invalid argument
    Last message repeated 1 times
Error writing trailer of pipe:: Invalid argument
frame=  118 fps= 30 q=-0.0 Lsize=  313200kB time=00:00:03.93 bitrate=652306.1kbits/s dup=53 drop=0 speed=   1x


    


    Does anyone now how to fix this problem or have any knowledge on how PyCharm Python Console works ?

    


  • Anomalie #4832 (Nouveau) : Passer les bulles de gifs animées sur les syndications en erreur en SVG...

    23 juin 2021

    Il reste des gifs pas très jojo sur le plugin.
    À remplacer par https://www.florin-pop.com/blog/2019/03/css-pulse-effect/ par exemple.

  • Unable to playback hardware encoded H.264 to RED5 server using FFmpeg

    26 février 2019, par Les

    I have a USB camera that is capable of H.264 on-board compression. I use the following FFmpeg command line to grab the encoded H.264 from the camera and put it in a ’flv’ container :

    ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv c:\temp\test.flv

    This works as expected and I can view the video using VLC no problem. Following this principle I then attempt to stream to a RED5 server using the following command :

    ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv rtmp://192.168.75.34/live/livestream

    The RED5 server detects the stream but I am unable to connect to it and view it using my basic Python program.

    If I do the same thing but use FFmpeg to carry out H.264 encoding of the default capture pin (MJPEG), it will stream correctly.

    I’m not sure if there is some flag in the command line that I might be missing ? Any help with this issue would be much appreciated.

    Here is the log output from the second FFmpeg command :

    C :\ffmpeg-latest-20190219\ffmpeg-static\bin>ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv rtmp ://192.168.75.176/live/livestream"

    ffmpeg version N-93151-gff03418348 Copyright (c) 2000-2019 the FFmpeg developers
    built with gcc 8.2.1 (GCC) 20190212
    configuration : —enable-gpl —enable-version3 —enable-sdl2 —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libdav1d —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libaom —enable-libmfx —enable-amf —enable-ffnvcodec —enable-cuvid —enable-d3d11va —enable-nvenc —enable-nvdec —enable-dxva2 —enable-avisynth —enable-libopenmpt
    libavutil 56. 26.100 / 56. 26.100
    libavcodec 58. 47.102 / 58. 47.102
    libavformat 58. 26.101 / 58. 26.101
    libavdevice 58. 6.101 / 58. 6.101
    libavfilter 7. 48.100 / 7. 48.100
    libswscale 5. 4.100 / 5. 4.100
    libswresample 3. 4.100 / 3. 4.100
    libpostproc 55. 4.100 / 55. 4.100

    Input #0, dshow, from ’video=USB Camera’ :
    Duration : N/A, start : 1834145.825000, bitrate : N/A
    Stream #0:0 : Video : h264 (Main) (H264 / 0x34363248), yuv420p, 1920x1080, 30 fps, 30 tbr, 10000k tbn, 20000k tbc

    Output #0, flv, to ’rtmp ://192.168.75.176/live/livestream’ :
    Metadata :
    encoder : Lavf58.26.101
    Stream #0:0 : Video : h264 (Main) ([7][0][0][0] / 0x0007), yuv420p, 1920x1080, q=2-31, 30 fps, 30 tbr, 1k tbn, 10000k tbc

    Stream mapping :
    Stream #0:0 -> #0:0 (copy)
    Press [q] to stop, [?] for help
    frame= 39 fps=3.2 q=-1.0 Lsize= 976kB time=00:00:07.10 bitrate=1124.8kbits/s speed=0.59x
    video:975kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.106110%

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