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• Download TS files from video stream

  13 avril 2017, par Nicky Smits

  Videos on most sites make use of progressive downloading, which means that the video is downloaded to my computer, and easy to trace. There are lots of extensions out there to do this, and even in the dev-tools this is easily done.

  On certain websites videos are streamed. which means that we do no just download 1 file, we download lots of small packages. In the dev-tools these packages can be traced. The website I’m interested in is : http://www.rtlxl.nl/# !/goede-tijden-slechte-tijden-10821/c8e2bff7-5a5c-45cb-be2b-4b3b3e866ffb.

  -The packages have a .TS extension.

  -Packages can be saved by copying the url of the request

  -I can not play these files.

  I must have done something wrong, or I’m missing something. I want to know what I am doing wrong. I want to create a chrome extension for personal use which captures the urls of all the packages. when I have all the urls I want to pass them on to a php scripts which downloads them and uses ffmpeg to paste them into a mp4 file.

  Please help me get the packages.

• pnacl-clang doesn't know where ffmpeg libraries are (but Eclipse does ?)

  10 août 2014, par lavsprat

  I’m trying to make my first "hello world"-like app using ffmpeg libraries. I already got NaCl SDK and downloaded & compiled the ffmpeg port.

  This is my code :

  main.c

  #include <libavformat></libavformat>avformat.h>
  
  
  
  int main()
  
  {
  
      av_register_all();
  
      return 0;
  
  }

  Building with $ (...)/pnacl-clang main.c -o main -lavformat in terminal.

  The output :

  main.c:2:10: fatal error: 'libavformat/avformat.h' file not found
  
  #include <libavformat></libavformat>avformat.h>
  
           ^

  Now, why am I not using -L(...)\lib and -I(...)\include in the build command ? Because it should work without it. In my workplace nacl-clang somehow knows where the libs are and compiles everything successfully. Why is that not working on my personal computer ? How can I permanently let pnacl-clang know where to look for them ?

• Compress video like whatsapp

  12 février 2016, par Copernic

  I’m not an expert in Video Editing but what I want to understand the logic of Whatsapp video processing.

  First of all I have noticed that whatever the file is, Whatsapp sets the limit of Uploaded videos to 16MO, after which whatsapp crops the video to not exceed the limit. is this a convention or it’s a personal choice ?

  Secondly, When a video is recorded using the Camera it’s not compressed by default, so whatsapp compresses it using FFMPEG I guess, and it takes no time. (tried for a video of 1min 1920x1080 with 125MO of size, becomes 640x360 with 5MO of size in no time, and the upload starts automatically).. how may they do this ? and why the choice of 640x360, It seems to me very fast for 2 asynchronous tasks : Compression + Upload.

  When I run the compression command ffmpeg -y -i in.mp4 -codec:v libx264 -crf 23 -preset medium -codec:a libfdk_aac -vbr 4 -vf scale=-1:640,format=yuv420p out.mp4 it takes approximatively 1 min and the video is being rotated !! :D

  Finally, when we download a video from Youtube it’s already compressed (I guess) and whatsapp doesn’t even try to compress it. So I think that it automatically detects thats the video is compressed. How can we detect this ?

  Thank you.