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• 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

• 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 ?

• Why does ffmpeg return "No such file or directory"

  4 juillet 2020, par JackNewman

  I'm trying to split a video file into 2 second increments and then merge the video back together.

  


  source_vid_path = r"C:\SplitAndMergeVids\Before\before.mp4"
ffcat_path = r'C:\SplitAndMergeVids\Chunk\video.ffcat'
chunks_path = r'C:\SplitAndMergeVids\Chunk\chunk-%03d.mp4'
segments_time = '2'
cmd_input = rf'ffmpeg -fflags +genpts -i {source_vid_path} -map 0 -c copy -f segment -segment_format mp4 -segment_time {segments_time} -segment_list {ffcat_path} -reset_timestamps 1 -v error {chunks_path}'
output = str(subprocess.run(cmd_input, shell=True, capture_output=True))
print(output)

output_path = r'C:\SplitAndMergeVids\Output\output.mp4'
second_input = rf'ffmpeg -y -v error -i {ffcat_path} -map 0 -c copy {output_path}'
output = str(subprocess.run(second_input, shell=True, capture_output=True))
print(output)


  


  First subprocess runs perfectly although the second outputs returns

  


  "Impossible to open 'chunk-000.mp4'\r\nC:\\SplitAndMergeVids\\Chunk\\video.ffcat: No such file or directory".


  


  Full output looks like

  


  CompletedProcess(args='ffmpeg -fflags +genpts -i C:\\SplitAndMergeVids\\Before\\before.mp4 -map 0 -c copy -f segment -segment_format mp4 -segment_time 2 -segment_list C:\\SplitAndMergeVids\\Chunk\\video.ffcat -reset_timestamps 1 -v error C:\\SplitAndMergeVids\\Chunk\\chunk-%03d.mp4', returncode=0, stdout=b'', stderr=b'')
CompletedProcess(args='ffmpeg -y -v error -i C:\\SplitAndMergeVids\\Chunk\\video.ffcat -map 0 -c copy C:\\SplitAndMergeVids\\Output\\output.mp4', returncode=1, stdout=b'', stderr=b"[concat @ 0000028691a6c6c0] Impossible to open 'chunk-000.mp4'\r\nC:\\SplitAndMergeVids\\Chunk\\video.ffcat: No such file or directory\r\n")


  


  When I run cmd_input and second_input manually in cmd, everything functions perfectly. I don't understand how in the first command I am making a file at "ffcat_path", then in the second command I'm using the same "ffcat_path" and it returns "No such file or directory" when it certainly does exist.