====== Creating video that can be played in Windows 7 ======

"The video you have sent me does not work."

  * Matroska file format is not supported.
  * H.264 video is supported, but not with the default yuvj422p color format.
  * MP3 sound is supported, but the sample rate 22050 S/s (and probably others) is not supported.

Suggested solutions:
  * Convince your client to use a better operating system.
  * Convince your client to install video player with non-Microsoft codecs.
  * [[http://web.messenger.cz/cz/kontakty/kariera/kuryr-cyklista-rozvoz-zasilek-po-praze.html|Quit]] [[https://www.abclinuxu.cz/blog/paulovo_doupe/mekac|"computers"]] [[http://www.jobs.cz/prace/?q[]=trash+manager|job]].
  * Use the following avconv command line.

<code>avconv -i infile -ar 48000 -acodec libmp3lame -pix_fmt yuv420p -y outfile.mp4</code>