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• C++/CLI — 0xc000007b (INVALID_IMAGE_FORMAT) with /clr option on

  9 mars 2015, par OverMachoGrande

  I’m trying to build a C++/CLI executable to which I statically link ffmpeg (libavcodec, libavformat, libavutil & swscale). It works fine if I build it normally (without /clr, so no CLR support), it works. However, when I add CLR support, it won’t start up with a 0xc000007b. A "Hello World" C++/CLI app runs fine, though.

  Supposedly the same thing happens with Boost::Threads, but since ffmpeg is pure C, I doubt it’s using Boost.

  My config :

  • Visual Studio 2008 Professional SP1
  • Windows XP Pro SP3 (x86)
  • .NET Framework 3.5 SP1

  Thanks,
  Robert

• How can I send a virtual camera to Genymotion or Android Studio Emulator in Ubuntu ?

  4 décembre 2020, par ykasur

  I created a virtual camera using v4l2loopback and ffmpeg. The command I use for ffmpeg is :
ffmpeg -re -l oop 1 -i vin.png -vf format=yuv420p -f v4l2 /dev/video2

  


  vin.png is the image I want to stream to the webcam and /dev/video2 is the virtual webcam I created with v4l2loopback.
The virtual webcam works and I can see it e.g. with onlinemicetest.com/webcam-test.
I'm using the Genymotion emulator with the newest Android API (I tried 7.0, 8.1 and 10.0) on Ubuntu 20.40.
Genymotion detects the virtual camera but only displays a dummy image :
Wrong dummy Image from Genymotion
I also tried (and would prefer to use) the android studio emulator. But I can only select Webcam0 in the configuration of the device camera and that points to the real integrated camera and not to my virtual webcam.

  


  I don't need to use ffmpeg, but I do need to use a tool that lets me control which image to stream from the command line.

  


  Is there a way to solve this ? Many thanks in advance !

  


  Update 17.11.2020 :
The Genymotion support answered me, that they plan to support virtual cameras in the future. They might be ready to add this in mid 2021.

  


• ffmpeg sRGB jpgs to rec709 mov

  9 mars 2021, par maxdownunder

  I'm trying to convert an sRGB jpeg sequence into a rec709 DnX Quicktime... but struggle to get the colormatrix right.

  


  ffmpeg -y -f image2 -start_number 1 -framerate 24 -i input.%04d.jpg -c:v dnxhd -vf "scale=1920:1080,fps=24,format=yuv422p10,colorspace=all=bt709:itrc=srgb" -b:v 175M -c:a pcm_s16le output.mov


  


  My understanding is this should set everything to rec709, but override the input response curve (itrc=srgb), but this fails with

  


  Unsupported input primaries 2 (unknown)
Error while filtering: Invalid argument
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0


  


  I haven't been able to come up with any combination of flags that doesn't trough an error and produces the right colors.

  


  Some docs here : ffmpeg filters trc

  


  Any help much appreciated !

  


  Edit :
Full log :

  


  $ ffmpeg -y -f image2 -start_number 1 -framerate 24 -i input.%04d.jpg -c:v dnxhd -vf "scale=1920:1080,fps=24,format=yuv422p10,colorspace=all=bt709:itrc=srgb" -b:v 175M -c:a pcm_s16le output.mov
ffmpeg version 4.3.1-2020-11-08-essentials_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev3, 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-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --en
able-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --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-li
bmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from 'input.%04d.jpg':
  Duration: 00:00:00.13, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1200:1200 DAR 16:9], 24 fps, 24 tbr, 24 tbn, 24 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> dnxhd (native))
Press [q] to stop, [?] for help
[swscaler @ 0000026ac0f81600] deprecated pixel format used, make sure you did set range correctly
Output #0, mov, to 'output.mov':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: dnxhd (DNXHD) (AVdn / 0x6E645641), yuv422p10le, 1920x1080 [SAR 1:1 DAR 16:9], q=2-1024, 175000 kb/s, 24 fps, 12288 tbn, 24 tbc
    Metadata:
      encoder         : Lavc58.91.100 dnxhd
[Parsed_colorspace_3 @ 0000026ac0f7e080] Unsupported input primaries 2 (unknown)
Error while filtering: Invalid argument
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!