Esrender's mod_video requires ffmpeg, mencoder and flvtool2 to provide support for different media-formats. To be of any use, mod_video has to be configured with the correct locations of these executables.
<?php define('PHPVIDEOTOOLKIT_FFMPEG_BINARY', '/path/to/ffmpeg'); define('PHPVIDEOTOOLKIT_FLVTOOLS_BINARY', '/path/to/flvtool2'); define('PHPVIDEOTOOLKIT_MENCODER_BINARY', '/path/to/mencoder');