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• bash : receive single frames from ffmpeg pipe

  30 août 2014, par manu

  I’m trying to achieve single-frame handling in a pipe where the the j2c encoder "kdu_compress" (Kakadu) only accepts single files. To save harddrive space. I didn’t manage to pipe frames directly, so I’m trying to handle them via a bash script, by creating each picture, process it, and overwrite it with the next.

  Here is my approach. Thanks for your advice, I really want to climb this mountain, though I’m a bit fresh here thanks.

  ---

  Is it possible to pipe an ffmpeg output to a bash script and save the individual frame,
  do further commands with the file before the next frame is handled ?

  Best result so far is, that ALL frames are added into the intermediate file, without recognizing the end of a frame.

  I used this ffmpeg setting to pipe, example with .ppm :

  ffmpeg -y  -i "/path/to/source.mov" -an -c:v ppm -updatefirst 1 -f image2 - \
  
   | /path/to/receiver.sh

  and this script as a receiver.sh

  #!/bin/bash  
  
  
  
  while read a; 
  
  do 
  
      cat /dev/null > "/path/to/tempfile.ppm"; #to empty the file first
  
      cat $a >> "/path/to/tempfile.ppm";        #to fill one picture
  
  
  
      kdu_compress -i /path/to/tempfile.ppm -otherparams   #to process this intermediate
  
  
  
  done
  
  exit;

  Thank you very much.

• Add project files for Visual Studio 2010 and later.

  6 juillet 2014, par Erik de Castro Lopo

  Add project files for Visual Studio 2010 and later.
  Also allows building for x86-64 Windows.
  Patch-from : lvqcl <lvqcl.mail@gmail.com>
  

  • [DH] FLAC-vs2010.sln
  • [DH] examples/c/decode/file/example_c_decode_file.vcxproj
  • [DH] examples/c/decode/file/example_c_decode_file.vcxproj.filters
  • [DH] examples/c/encode/file/example_c_encode_file.vcxproj
  • [DH] examples/c/encode/file/example_c_encode_file.vcxproj.filters
  • [DH] examples/cpp/decode/file/example_cpp_decode_file.vcxproj
  • [DH] examples/cpp/decode/file/example_cpp_decode_file.vcxproj.filters
  • [DH] examples/cpp/encode/file/example_cpp_encode_file.vcxproj
  • [DH] examples/cpp/encode/file/example_cpp_encode_file.vcxproj.filters
  • [DH] src/flac/flac.vcxproj
  • [DH] src/flac/flac.vcxproj.filters
  • [DH] src/flac/iffscan.vcxproj
  • [DH] src/flac/iffscan.vcxproj.filters
  • [DH] src/libFLAC++/libFLAC++_dynamic.vcxproj
  • [DH] src/libFLAC++/libFLAC++_dynamic.vcxproj.filters
  • [DH] src/libFLAC++/libFLAC++_static.vcxproj
  • [DH] src/libFLAC++/libFLAC++_static.vcxproj.filters
  • [DH] src/libFLAC/libFLAC_dynamic.vcxproj
  • [DH] src/libFLAC/libFLAC_dynamic.vcxproj.filters
  • [DH] src/libFLAC/libFLAC_static.vcxproj
  • [DH] src/libFLAC/libFLAC_static.vcxproj.filters
  • [DH] src/metaflac/metaflac.vcxproj
  • [DH] src/metaflac/metaflac.vcxproj.filters
  • [DH] src/plugin_common/plugin_common_static.vcxproj
  • [DH] src/plugin_common/plugin_common_static.vcxproj.filters
  • [DH] src/share/getopt/getopt_static.vcxproj
  • [DH] src/share/getopt/getopt_static.vcxproj.filters
  • [DH] src/share/grabbag/grabbag_static.vcxproj
  • [DH] src/share/grabbag/grabbag_static.vcxproj.filters
  • [DH] src/share/replaygain_analysis/replaygain_analysis_static.vcxproj
  • [DH] src/share/replaygain_analysis/replaygain_analysis_static.vcxproj.filters
  • [DH] src/share/replaygain_synthesis/replaygain_synthesis_static.vcxproj
  • [DH] src/share/replaygain_synthesis/replaygain_synthesis_static.vcxproj.filters
  • [DH] src/share/utf8/utf8_static.vcxproj
  • [DH] src/share/utf8/utf8_static.vcxproj.filters
  • [DH] src/share/win_utf8_io/win_utf8_io_static.vcxproj
  • [DH] src/share/win_utf8_io/win_utf8_io_static.vcxproj.filters
  • [DH] src/test_grabbag/cuesheet/test_cuesheet.vcxproj
  • [DH] src/test_grabbag/cuesheet/test_cuesheet.vcxproj.filters
  • [DH] src/test_grabbag/picture/test_picture.vcxproj
  • [DH] src/test_grabbag/picture/test_picture.vcxproj.filters
  • [DH] src/test_libFLAC++/test_libFLAC++.vcxproj
  • [DH] src/test_libFLAC++/test_libFLAC++.vcxproj.filters
  • [DH] src/test_libFLAC/test_libFLAC.vcxproj
  • [DH] src/test_libFLAC/test_libFLAC.vcxproj.filters
  • [DH] src/test_libs_common/test_libs_common_static.vcxproj
  • [DH] src/test_libs_common/test_libs_common_static.vcxproj.filters
  • [DH] src/test_seeking/test_seeking.vcxproj
  • [DH] src/test_seeking/test_seeking.vcxproj.filters
  • [DH] src/test_streams/test_streams.vcxproj
  • [DH] src/test_streams/test_streams.vcxproj.filters
  • [DH] src/utils/flacdiff/flacdiff.vcxproj
  • [DH] src/utils/flacdiff/flacdiff.vcxproj.filters
  • [DH] src/utils/flactimer/flactimer.vcxproj
  • [DH] src/utils/flactimer/flactimer.vcxproj.filters

• ffmpeg drawtext on ubuntu : ffmpeg does not change text location [closed]

  10 juin 2024, par Wolf Wolf

  I am designing a video editor bot for Telegram. I want to use ffmpeg
and I need a text to be placed on the video and change the place of
the text randomly every few seconds.

  


  There is an example on the site itself.

  


  I used the following command :

  


     ffmpeg -i
   "/home/editor/downloads/video_2023-07-10_17-53-05_7375753324605210932.mp4"
   -filter:v drawtext="fontsize=30:fontfile=/usr/share/hellotext=hellotext/share/World':
   x=if(eq(mod(t\,30)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod (t\,30
   )\, 0)\,rand(0\,(h-text_h))\,y)" -codec:v libx264 -codec:a copy
   -preset slow -crf 18 -y output.mp4


  


  This command executes and even the text is placed on the video, now
the problem is that it doesn't change the location of the text. I
tested this before and it worked fine, but now it doesn't run
properly.