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• ffmpeg add long text in multiline automatically

  30 juillet 2016, par Pranoy C

  I am using ffmpeg to add text to a video. Currently this command works for me :

  ffmpeg -y -i cut.mp4 -vf drawtext="fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf: text='Stack Overflow': fontcolor=white: fontsize=24: box=1: boxcolor=black@0.5: boxborderw=5: x=(w-text_w)/2: y=main_h-(text_h*3)" -codec:a copy output.mp4

  1. If I have a very long text "Stack Overflow is awesome and this is a test of long text", is there a way to automatically make it wrap without me having to insert new line characters in the text ?

  Currently such a text just goes off the screen if I don’t have newline characters.

  2. Is there a way to specify maximum width & height for the text ?

• Facing libavfilter error while doing cmake for NVIDIA-DALI library on ubuntu version

  27 avril 2019, par vamsi

  — Installed OpenCV 3.4.4 which NVIDIA DALI recommended.
  — below link for NVIDIA DALI reference.
  https://docs.nvidia.com/deeplearning/sdk/dali-developer guide/docs/quickstart.html
  — below link for OpenCV installation :
  https://www.pyimagesearch.com/2018/05/28/ubuntu-18-04-how-to-install-opencv/

  —NVIDIA DALI using below versions :
  -DALI version : 0.10.0dev
  -Found PythonInterp : /usr/bin/python (found version "2.7.15")
  -Found CUDA : /usr (found suitable version "9.1", minimum required is "8.0")
  -Found OpenCV : /usr/local/include ;/usr/local/include/opencv (found suitable version "3.4.4", minimum required is "2.0")

  ---This is the error(No package ’libavfilter’ found) i am getting.

  • Found CUDA : /usr (found suitable version "9.1", minimum required is "8.0")
     Building WITHOUT nvJPEG
     Building WITHOUT JpegTurbo
     Found OpenCV : /usr/local/include ;/usr/local/include/opencv (found suitable version "3.4.4", minimum required is "2.0")
    OpenCV libraries :
    opencv_core ;opencv_imgproc ;opencv_imgcodecs

  • Found PythonLibs : /usr/lib/x86_64-linux-gnu/libpython2.7.so
     pybind11 v2.2.4
     Found Protobuf : /usr/lib/x86_64-linux-gnu/libprotobuf.a ;-lpthread (found suitable version "3.0.0", minimum required is "2.0")

  • Enabling TensorFlow TFRecord file format support

  • Found PkgConfig : /usr/bin/pkg-config (found version "0.29.1")
  • Checking for module ’libavformat’
  • Found libavformat, version 58.20.100
     Checking for module ’libavcodec’
  • Found libavcodec, version 58.35.100
     Checking for module ’libavfilter’
    No package ’libavfilter’ found

  CMake Error at /usr/share/cmake-3.10/Modules/FindPkgConfig.cmake:415 (message) :
  A required package was not found
  Call Stack (most recent call first) :
  /usr/share/cmake-3.10/Modules/FindPkgConfig.cmake:593 (_pkg_check_modules_internal)
  cmake/Dependencies.cmake:176 (pkg_check_modules)
  CMakeLists.txt:45 (include)
   Configuring incomplete, errors occurred !
  See also

• Build FFmpeg version 1.2.1 with android JNI

  6 juillet 2013, par vijay

  I used halfninja tutorial to build my FFmpeg and x264 to concat video files of different codecs. I builded it successfully using ReadMe.My problem is it works fine only for mpg and mp4(with some changes).

  I cannot concat 3gp files using FFmpeg.The output file generated is empty if use the command used to concat mpg files.. When i searched for i was advised to go for latest version of FFmpeg.

  So i downloaded the latest version and tried to build using the same steps but with no success.If anybody had built the latest version with android ndk-build, please share the steps or build scripts since i spent two weeks in this.

  Any help is appreciated.