I have been tyring to use the standard K2 image as the video poster in JW Allvideos. After a lot of investigation, I worked out how to do it and I thought I would share it. This works, but probably does not cover all possibilities.
Using Jooma 1.7.3, K2 V2.5.4 and AllVideos 4.1.
In plugin/content/jw_allvideos/jw_allvideos.php :
around line 80 /* Video Parameters */
add this new line:
$postimage = ($params->get('postimage')); //new line
around line 230 add this line:
$output->posterFrame = $postimage; //new line
just above this line : // Width/height/source folder
in /components/com_k2/models/item.php around line 417 add this new line
else {
$item->videoType='allvideos';
$params->set('afolder', 'media/k2/audio');
$params->set('vfolder', 'media/k2/videos');
$params->set('postimage', $item->imageMedium); //new line
you can change 'Medium' to a more suitable size if you wish.
Hope this helps